Patent Grant
9182486
Embodiments of the present invention relate generally to sonar systems, and more particularly, to managing and rendering sonar data.
Sonar has long been used to detect waterborne or underwater objects. Sonar devices may be used to determine depth and bottom topography, detect fish or other waterborne objects, locate wreckage, etc. In this regard, due to the extreme limits on underwater visibility, sonar is typically the most accurate way to locate objects underwater. Devices such as transducer elements, or simply transducers, have been developed to produce sound or vibrations at a particular frequency that is transmitted into and through the water. Echo returns from the transmitted sound reflected off an object are received, either by the same transducers or by separate receiver elements and are converted into an electrical signal. These electrical signals can be analyzed and interpreted to obtain information about underwater structures.
Transducer technology and sonar techniques continue to evolve, such that information about larger underwater areas is being captured more rapidly. Innovations in both downscan and sidescan sonar technology have contributed to this increase in the amount of data being collected from the transducers and transducer arrays. Due to this availability of large amounts of detailed information, innovative ways to present this data can be considered and implemented.
Traditionally, sonar data has been rendered relative to the source of the sonar beam (i.e., the transducers). Since the only constant reference for the sonar data is this beam origin, renderings of sonar data can be difficult to interpret. For example, consider a transducer that is affixed to a watercraft. The transducer may continuously receive return echoes describing the underwater surroundings of the watercraft. However, by simply considering the content of the raw sonar data retrieved from a transducer, the physical movement of the watercraft is unaccounted for in the rendering of the data. Based on the raw sonar data alone, it can be unclear whether the watercraft was traveling in a straight line (e.g., due north) or if the watercraft is circling the same location. Because the only reference is the transducer or the watercraft itself, the context in which the raw sonar data is being provided can be unclear and confusing, particularly for a novice to sonar technology.
As such, it may be desirable to manage and render raw sonar data in different contexts in order to increase the interpretability of the data to a user.
Example embodiments of various sonar rendering systems and methods are described herein. One example embodiment is an apparatus comprising a transducer assembly, position sensing circuitry, processing circuitry, and a display device. The transducer assembly may be configured to emit a sonar beam, receive return echoes of the sonar beam, and convert the return echoes into raw sonar data. The transducer assembly may also be configured to be affixed to a watercraft. The position sensing circuitry may be configured to determine positioning data. The positioning data may be indicative of a position of the watercraft. The processing circuitry may be configured to receive the raw sonar data and the positioning data, convert the raw sonar data into range cell data based at least on amplitudes of the return echoes, make a location-based association between the raw sonar data and the positioning data, plot the range cell data based on respective positions derived from the positioning data and rotate the range cell data based on a direction of movement of the watercraft to generate adjusted range cell data. The adjusted range cell data may then be converted into sonar image data. According to some embodiments, such as those where the transducer element is operating as a sidescan transducer, the range cell data may be rotated based on the direction of movement of the watercraft such that the range cell data is rotated to extend in a direction that is substantially perpendicular to the direction of movement of the watercraft. The display device may be configured to render the sonar image data with a presentation of a geographic map.
Various example method embodiments are also described. One example method comprises emitting a sonar beam by a transducer assembly, receiving return echoes of the sonar beam, and converting the return echoes into raw sonar data. The transducer assembly may be configured to be affixed to a watercraft. The example method may also include determining positioning data by position sensing circuitry, where the positioning data is indicative of a position of the watercraft. The example method may also comprise receiving the raw sonar data and the positioning data by processing circuitry, converting the raw sonar data into range cell data based at least on amplitudes of the return echoes, make a location-based association between the raw sonar data and the positioning data, plotting the range cell data based on respective positions derived from the positioning data and rotating the range cell data based on a direction of movement of the watercraft to generate adjusted range cell data, converting the adjusted range cell data into sonar image data, and rendering, by a display device, the sonar image data with a presentation of a geographic map.
Other example embodiments may include computer-readable media having computer-program instructions stored thereon. One example embodiment is a non-transitory computer-readable medium comprised of at least one memory device having computer program instructions stored thereon. The computer program instructions may be configured to, when executed by processing circuitry, to cause an apparatus to perform various functionalities. Those functionalities may include emitting a sonar beam by a transducer element, receiving return echoes of the sonar beam, and converting the return echoes into raw sonar data. The transducer element may be configured to be affixed to a watercraft. The computer program instructions may also be configured to cause the apparatus to determine positioning data by position sensing circuitry. The positioning data may be indicative of a position of the watercraft. The functionalities performed by the apparatus due to the execution of the computer program instructions may also include receiving the raw sonar data and the positioning data by processing circuitry, converting the raw sonar data into range cell data based at least on amplitudes of the return echoes, make a location-based association between the raw sonar data and the positioning data, plotting the range cell data based on respective positions derived from the positioning data and rotating the range cell data based on a direction of movement of the watercraft to generate adjusted range cell data, converting the adjusted range cell data into sonar image data, and rendering, by a display device, the sonar image data with a presentation of a geographic map.
Having thus described the some example embodiments of the invention in general terms, reference will now be made to the accompanying drawings, which are not necessarily drawn to scale, and wherein:
a illustrates a series of water columns of range cell data that have been plotted and rotated according to some example embodiments;
b illustrates a series of operations for removing a water column from a sonar column according to some example embodiments;
Exemplary embodiments of the present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. Indeed, the invention may be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements. Like reference numerals refer to like elements throughout.
The transducer element 105 may include a piezoelectric material in the form of a crystal that may be constructed to produce vibrations (e.g., sound) at a particular frequency for transmission through water. The vibrations generated by the transducer element 105 may take the form of a sonar beam that is emitted from the transducer element 105. Based on the architecture and mounting angle of the transducer element 105, the sonar beam may define an underwater volume that is affected by the beam. Transducer element 105 may be configured to generate any type of sonar beam, such as, for example, a conical beam, a fan-shaped beam, or the like, and may be mounted such that the beam is directed in any desired direction.
In some example embodiments, the transducer element 105 may be constructed and mounted such that the transducer element 105 operates as a sidescan transducer element. As its name implies, a sidescan transducer element may be directed to look to a side of a vessel, as opposed to being aimed directly below a vessel (i.e., a downscan transducer element). A side scan transducer may generate a somewhat planar beam pattern that is relatively narrow in beamwidth in a horizontal direction parallel to the keel of a vessel and is relatively wide in beamwidth in a vertical direction perpendicular to the keel of the vessel.
Regardless of the architecture and mounting angle, the transducer element 105 may also be configured to receive echo returns from the generated sonar beam. However, in some example embodiments, a transmitting transducer may be used to emit the sonar beam and a receiving transducer may be used to receive the echo returns. The transducer element 105 may be configured to convert the echo returns into electrical signals, also referred to as raw sonar data, that may be analyzed. Based on the time difference from when the sonar beam was emitted to when an echo return was received, information about the seafloor and underwater structures can be determined. As such, the transducer element 105 may be controlled by processing circuitry 115 to trigger the transducer element 105 (e.g., at a particular scan rate) to emit a sonar beam and receive the electrical signals indicative of echo returns to be analyzed and interpreted.
According to some example embodiments, the transducer element 105 may be one element in a transducer array that produces multiple sonar beams.
The sonar system 100 may also include position sensing circuitry 110 that is configured to determine a current location of an object that the position sensing circuitry is affixed to. The current location may be included as, for example, coordinates (e.g., longitude and latitude), in positioning data generated by the position sensing circuitry. In an example embodiment where the position sensing circuitry 110 is affixed to a watercraft, the position sensing circuitry may indicate the location of the watercraft. In this regard, the position sensing circuitry 110 may include an antenna and associated processors configured to receive global positioning system (GPS) signals and determine a current location. The positioning data may therefore be provided in the form of GPS coordinates that can be used to geo-tag various types of information. Additionally, or alternatively, the position sensing circuitry 110 may be configured to determine a location through the reception of WiFi signals, cellular telephone system signals, or the like. The position sensing circuitry 110 may interface with the processing circuitry 115 to provide positioning data to the processing circuitry 115. According to some example embodiments, the position sensing circuitry 110 may also determine a direction and speed of movement, and provide the direction and speed of movement in the positioning data provided to the processing circuitry 115. Alternatively, the processing circuitry 115 may be configured to determine the direction and speed of movement based on historical time-stamped location information received from the position sensing circuitry 110.
The processing circuitry 115 may be configured to receive raw sonar data from the transducer element for conversion and analysis. In this regard, the processing circuitry 115 may be configured to process the raw sonar data for rendering by the display device 125 and/or storage in the memory device 120. Further, the processing circuitry 115 may be configured to receive positioning data from the position sensing circuitry and associate the raw sonar data to the positioning data to determine the location and time at which the raw sonar data was acquired. In this regard, the processing circuitry 115 may be configured to make a location-based and/or temporal association between the raw sonar data and the positioning data. Additionally, in some example embodiments, the processing circuitry 115 may be configured to control the operation of the transducer element 105 to cause the transducer element 105 to generate a sonar beam at a particular scan rate. For each scan the transducer element 105 may generate, and upon generation transmit to the processing circuitry 115, an incremental set of raw sonar data for the scan. According to some example embodiments, the scan rate may be fixed or the scan rate may be dynamically modified based on, for example, the current speed of the watercraft. The processing circuitry 115 may also be configured to receive each incremental set of raw sonar data from the transducer element 105 and, in response to receiving the incremental set of raw sonar data, process the data to generate a sonar column of range cell data. The processing circuitry 115 may also be configured to generate sonar image data for rendering upon generating the range cell data.
The processing circuitry 115 may include one or more hardware processors (e.g., microprocessors) that are configured to retrieve instructions from a memory device (e.g., memory device 120) for execution by the processors. In this regard, the processing circuitry 115 may include a general purpose microprocessor that is converted into a particular machine through the execution of computer program instructions. Some of the various example embodiments described herein may be implemented through the execution of computer program instructions stored on the memory device 120 by the processing circuitry 115. The functionality described with respect to the sonar map module 130,
The processing circuitry 115 may be centralized in a single housing (e.g., in a multi-function display (MFD) device) or the processing circuitry may be distributed. For example, some processing of the raw sonar data may be performed by a sonar coprocessor that may be housed with the transducer element 105, in a separate housing, or in a common housing with other processing circuitry.
The memory device 120 may comprise one or more data storage and retrieval devices that are configured to store instructions or data and provide the instructions or data when requested. The memory device 120 may be a non-transitory computer-readable medium. The memory device 120 may include volatile and/or non-volatile memory devices. Such memory devices may include on-board or on-chip memories, removable memory cards, hard drives, and the like. As mentioned above, the memory device 120 may be configured to store computer program instructions for execution by a processing device included in the processing circuitry 115. As further described below, the memory device 120 may be a date storage device that stores raw sonar data and transformed versions of the raw sonar data, such as range cell data and Saved Mode data structures.
The display device 125 may be any type of visual output device that renders information for consideration by a user. In this regard, the display device may include a display panel such as a liquid crystal display panel. While in some example embodiments, the display device may be simply a display panel that is controlled by the processing circuitry 115, in other example embodiments, the display device 125 may include some or all of the processing circuitry 115. For example, the processing circuitry external to the display device 125 may be configured to convert the raw sonar into range cell data (described further below) and the display device 125 may include processing circuitry configured to convert the range cell data into sonar image data for rendering on the display panel. As such, the display device 125 may include one or more hardware configured processors or processors that may be configured through the execution of computer program instructions.
In some example embodiments, the display device 125 may also include a user input interface for receiving user inputs and selections that may be passed to the processing circuitry 115 to trigger various functionalities. In this regard, the display device 125 may be a touch screen display, may include dynamically configurable softkeys, and/or may include a keypad. Further, according to various example embodiments, the display device may be a multi-function display (MFD) or may be a component of the MDF.
Although not depicted in
According to various example embodiments, the sonar system 100 may be configured to perform various functionalities as further described below through the configuration of the sonar map module 130. In some example embodiments, the sonar map module 130 may take the form of computer executable instructions stored in the memory device 120, that, when executed, cause the processing circuitry 115 and the sonar system 100 to perform the functionality described with respect to
As described above, similar to transducer element 105, transducer 305 may be configured to generate raw sonar data. In the sonar system 300, the raw sonar data may be provided to the sonar coprocessor 310 for initial processing. As further described below, the raw sonar data may be converted into range cell data and provided to the sonar data module 340. The sonar data module 340 may configured to make a location-based association between range cell data received from the sonar coprocessor 310 and positioning data received from the GPS unit 345. The time-and-position-stamped range cell data may then be processed by the sonar map module 320 and provided together with a chart 350 (or map) to display 355 for rendering in the various manners described herein.
The following describes various example embodiments for transforming and rendering raw sonar data in different contexts, which may be performed by the sonar systems 200 and 300, through the configuration of the sonar map modules 130 and 320, respectively. It is understood that the sonar systems 200 and 300 are merely examples of computing systems that may be configured to perform the various functionalities. For example, computing systems that are not configured for mounting to a watercraft and do not have interfaces to sonar transducer elements may be configured to perform at least some of the functionality described herein. Additionally, it will be apparent to one of skill in the art that the following described functionalities may be performed together in a unified manner or as separate, independent functions where appropriate.
To generate the waterfall view 400 and the data used to render the waterfall view 400, one or more data conversions may take place. A transducer element may collect raw sonar data which may be transferred to processing circuitry (e.g., a sonar coprocessor). The processing circuitry may be configured to convert the raw sonar data into an intermediate form, referred to as range cells or range cell data. According to some example embodiments, the conversion to range cell data is not a conversion to color palette pixel values. Rather, the range cell data maintains a relative native format that permits subsequent changes in contrast that would not be capable if a conversion to color palette pixel values were performed at this point. According to some example embodiments, each range cell may be a single of byte of data.
According to various example embodiments, a range cell may be a form of the sonar data that indicates an amplitude of an echo return at a particular depth (or distance from the transducer). In this regard, the range cell data may include an indication of the amplitude of the echo returns at particular timings for the echo returns. For example, if a sonar column is broken up into individual elements (e.g., echo returns), each element may define a respective range cell. The range of values that a range cell may be assigned can be implementation dependent. For example, a range for range cell values may be 0 to 7, 0 to 255, or the like. If a range of 0 to 255 is used, a value of 0 may represent no return of echo data, while a value of 255 may represent the strongest return of echo data.
When rendering the sonar data, the range cell values may be converted into pixel values. For example, the pixels may be formatted in a 32-bit ARGB (Alpha, Red, Green, Blue) pixel format, where each segment of the pixel may be 8 bits. For explanation purposes, consider the alpha portion of each pixel to be 255, indicating no transparency. Based on an example range cell that has a value of 142 on a 0 to 255 range, a pixel in a first color palette may be derived that has a value of (255, 0, 83, 189) (i.e., mostly blue with a little green). If an alternative color palette is used, that same range cell value of 142 may be used to derive a pixel having a value of (255, 137, 115, 63), which is brownish in appearance.
The use of the range cell value allows different color palettes to be implemented, where changes in contrast do not affect the information provided in the resultant pixel values. If, on the other hand, a pixel value-to-pixel value direct conversion between color palettes is performed, the contrast setting may have an impact on the conversion. To perform a pixel value-to-pixel value direct conversion, a conversion table associating each pixel value in a first color palette to each pixel value in a second color palette may be used. For example, a blue color palette pixel value of (255, 0, 83, 189) may be converted to (255, 137, 115, 63) when the brown palette is selected based on the entries in a table. As such, in some example embodiments, conversion tables for converting between each of the palettes may be generated. In contrast, the use of range cell values to derive pixel values can avoid the need to generate and store these conversion tables.
Further, the use of range cell values can avoid issues that can arise from dependence on a contrast setting. For example, consider a worst case scenario where the contrast is set to an undesirable setting. The contrast setting may cause the pixel value to be all white—(255, 255, 255, 255). Accordingly, if pixel values are stored, for example to a Saved Mode data structure, after a contrast setting effects the pixel values, information that could be derived from the range cell values may be lost. Therefore, storing and using the range cell values, can avoid this loss of information introduced by the contrast setting.
A collection of range cells captured during a scan may be referred to as a sonar column. Additionally, a sonar column may include range cell data derived from scans taken by multiple transducers (e.g., two sidescan transducers). According to some example embodiments, each sonar column of range cell data may be processed to generate sonar image data (e.g., plotted color palette pixel values), which may be rendered as a visual representation of the sonar column on a display. When applied in the waterfall view, image data representative of a sonar column may be added to the top of the view as a row. To convert the range cell data to image data and render the representation of the sonar column, values in the range cell data may be converted to color palette pixel values, and each of the pixel values may be rendered on a display panel. The newest representation of a sonar column may be rendered at the top of the waterfall view 400 (i.e., rendered horizontally despite being referred to as columns), and existing historical data may be moved downward or off the view.
Each sonar column may be associated with a scan or beam emission performed by the transducer or a transducer array at a particular time. Based on a scan rate that may be controlled by processing circuitry of a sonar system, new sonar columns may be generated and prepared for rendering. Each sonar column may also be associated, by the processing circuitry, to a geo-location at the sonar column's center point. The geo-location of the sonar column may be determined based on the location of the watercraft at the time when the sonar column data was captured as indicated by the position sensing circuitry. The sonar column may also be time-stamped or given a sequence number that may be used to determine the ordering of the sonar columns. Similarly, the range cell data may be plotted and time-stamped.
Referring back to
Additionally, the only constant reference in the rendering of the waterfall view 400 is the location of the watercraft (or rather the location of the transducers). In other words, the rendering in the waterfall view itself is not geo-referenced, and therefore the waterfall view rendering could not be directly placed on a map. Since the watercraft is the only reference, movement of the watercraft is not apparent from the waterfall view. The direction and the speed of the watercraft (other than in a forward direction) are not considered when rendering the waterfall view. Regardless of whether the watercraft is headed on a straight bearing or the watercraft is turning in circles, both would appear on the waterfall view as movement in a straight line from the bottom of the view to the top of the view.
This aspect of the waterfall view is illustrated in the waterfall view 600 of
According to some example embodiments, a Live Mode rendering of the sonar data on a map may be implemented. In the Live Mode, the sonar data is presented on a map, as the data is being captured and processed, and is therefore provided as a sonar image trail. The Live Mode may render the sonar data to the user in real-time or near real-time (in consideration of processing delays). Another implementation mode may be Saved Mode. In Saved Mode, the range cell data is saved in a memory device and is converted into a modified format to facilitate rendering. Live Mode and Saved mode may be implemented in isolation from the other, or together at the same time.
In order to implement a Live Mode rendering, the range cell data of each sonar column may be separately considered, or, in some example embodiments each range cell may be considered separately. In this regard, each sonar column of range cells may be associated with positioning data indicative of a center point of the sonar column, and the sonar column may be plotted (i.e., associated with a location) at a geo-location associated with the center point, and thereby the range cell data of the sonar column can be plotted and rotated. According to some example embodiments, plotted and rotated range cell data may be referred to as adjusted range cell data. Based on the direction of movement of the watercraft, for example derived from historical positioning data, the sonar column and the range cell data may also be translated. To translate the range cell data of a sonar column in this manner, the aimed direction of the sonar beams for each transducer relative to the keel of the watercraft may be used. For example, where the range cells of the sonar column are side scan data that was generated by at a ninety-degree angle to the forward movement of the watercraft (to the keel), the sonar column may be oriented with a center point at the boat position when the sonar column was generated by a fan-shaped beam directed, and rotated to be perpendicular to the direction of movement at that time. As such, if the watercraft is in a turn, each sonar column may fan out through the turn. Accordingly, since the data of the sonar column is now plotted and rotated with respect to a geo-location and the direction of movement, each range cell in the sonar column can be associated with a given geo-location based on the range cell's offset from the center point of the sonar column. Accordingly, pixel data that is derived from the range cells can also be geo-located and rendered accordingly.
a illustrates sonar columns 715 of range cell data that have been plotted and rotated. Plotting may refer to the placement of the sonar columns and the associated range cell data at relative positions or geographic positions. The spacing between the sonar columns may account for or reflect the scan rate of the transducers and the speed of the watercraft. In this regard, at a fixed scan rate, a watercraft moving at high speed will collect fewer sonar columns per geographic unit area. As such, according to some example embodiments, the scan rate of the transducers may be dynamically controlled based on the speed of the watercraft to increase the number of scans per unit of time. For illustration purposes, the adjusted range cell data illustrated in
It can also be seen in
While
As mentioned above, the sonar columns captured during the turn may overlap in the interior portion of the turn. According to some example embodiments, the most recently captured information for a given location may be used for rendering. In other words, at a particular location where an overlap of sonar data has been captured, the most recently captured range cell data for that location may be used when rendering an indication of the sonar data.
As an alternative, rather than using the most recently captured range cell data for a given location when overlapping data has been captured, according to some example embodiments, the range cell data from various sonar columns may be merged by rendering the peak value for the each of the range cells captured at a given location. For example, if a first sonar column includes a range cell at a given location with a value of 146 and a second sonar column includes a range cell data at the same location with a value of 65, a pixel derived from the 146 value may be used for rendering, regardless of the order in which the sonar columns were captured. This technique of using the peak value range cell for rendering at a given location can be used in both Live Mode and Saved Mode, as described herein. Further, the technique may be used anytime data is overlapped, such as for example, when the same geographic area is captured during multiple passes. In this regard, overlapping of data need not occur only during a turn. Overlap may occur when surveying passes are being performed in a particular area and some areas are captured twice. As further described below, in Saved Mode multiple files of sonar data may be rendered simultaneously. These files may have been captured at substantially different times (e.g., weeks, months, or years apart), but may nonetheless have overlapping data at particular locations. These files may nonetheless be rendered together, and the peak value range cell for a given location may be determined from amongst a plurality of files to determine which range cell value to render at a given location. Further, when compiling overlapping data into a single data structure, the peak value range cell for a given location may be stored, while others for that same location are not stored or are discarded. According to some example embodiments, additional or alternative criteria may be considered when determining which range cell value to render and/or store. For example, according to some example embodiments, criteria such as the degree of turning by a vessel when the range cell value was captured (e.g., favoring range cell values that were captured when the vessel was traveling in mostly a straight line (low turn degree) and disfavoring range cells that were captured when the vessel was in a tight turn (high turn degree)). Additionally, or alternatively, range cell values near the extents of the sonar column (furthest from the transducer) may be favored over range cell values that were captured at closer distances to the transducer.
Additionally,
The sonar image data used to render the adjusted sonar representation 820 may be derived from the range cell data of the sonar columns and converted into color palette pixel values (similar to the coloring used in the waterfall view). According to some example embodiments, the sonar columns of range cell data may be rendered at a location on the geographic map that is associated with an area that the sonar beam of the transducer element captured to generate the associated raw sonar data. As indicated in
As stated above, the Live Mode composite map may be updated as new sonar data is received and processed. Similar to the waterfall view, a memory buffer may be used that, when full, removes the oldest sonar column and adds the most recent sonar column. Accordingly, in some example embodiments, based on the size of the memory buffer, a fixed number of sonar columns may be rendered on a display once the buffer is full. When rendering, the oldest incremental set of sonar image data may therefore be removed from the buffer or rendering may be otherwise discontinued (e.g., due to overwriting of the data), upon rendering a new incremental set of sonar image data.
According to some example embodiments, to reduce the processing power needed to perform a rendering of the data of a sonar column, the geographic region covered by the data of the sonar column may be considered prior to processing. In this regard, if no portion of the region covered by the data of the sonar column is currently viewable in the display (e.g., that portion of the map is not visible), then the data of the sonar column need not be processed for rendering. Alternatively, if a portion (e.g., one or more range cells) of the sonar column would be present on the current display, then the data of the sonar column may be processed and rendered.
Via a user interface of the display device, a user may activate Live Mode. Once activated, the sonar columns may be rendered on the display as the data is received. According to some example embodiments, after activation of the Live mode, the sonar columns may be rendered based on a regular timer signal, or upon receipt of a given or threshold number of sonar columns that have yet to be rendered.
An alternative to presenting indications of the actual sonar data in the Live View composite map, may be to render extent trails. Since the rendering of the actual sonar data may be processing intensive, some applications may require only that the areas that have been scanned be indicated on the composite map.
As described above, the data of a sonar column may have a determinable corresponding physical width. Based on this width, extent trails of the sonar beams can be rendered on a composite map to indicate the areas from which sonar data has been collected, without the need of actually rendering indications of the actual sonar data.
Extent trails functionality may be useful in a variety of applications including, for example, surveying applications. To create a high-quality survey, consecutive passes made by the watercraft should be aligned next to each other with little or no overlap of the side scan beam. With the use of extent trails, this type of surveying can be conducted since a rendering of the covered areas is provided on the display. Additionally, since Live Mode rendering can require substantial processing power, some sonar systems that lack the requisite processing power may use the extent trails functionality to indicate the areas where data has been acquired for subsequent use as part of the Saved Mode, which may be supported by sonar systems having lesser processing power. Further, the extent trails may be rendered for a longer period than a Live Mode rendering, since rendering of the extent trails does not require the memory capacity that a Live Mode rendering may require.
Yet another optional feature that may be implemented in the Live Mode or in the Saved Mode (as described below) may be a composite map with depth sounding indicators. The composite map 1000 of
According to some example embodiments, a sonar system may be configured to implement a Saved Mode. In the Saved Mode, raw sonar data may be converted into sonar columns of range cell data, and the range cell data may be stored in a local memory device (e.g., memory device 120). The range cell data may be further transformed into a data structure comprising a collection of tile-based resolution layers that facilitate the rendering of sonar data either on a display of a sonar system installed in a watercraft or on an external display device that may not have an interface to transducers and other sonar hardware (e.g., a business or household computer system, a mobile computing device such as a smartphone or a tablet device, or the like).
In the Saved Mode, there may be no limitation on the amount of data that may be rendered. Unlike the Live Mode, implementation of the Saved Mode renders sonar data that was previously stored in a memory device. Accordingly, the Saved mode may be useful in surveying applications and the like.
As such, Saved Mode operation may involve the conversion of range cell data into an intermediate form, prior to a subsequent conversion to image data at rendering time. According to some example embodiments, range cell data is generated from the raw sonar data provided by the transducer element, and stored as a sonar log file (e.g., an .sl2 file) which may be stored in a memory device such as a data storage device. The sonar log files may be further converted, according to some example embodiments, into a data structure (e.g., a file) that facilitates rendering of the sonar data through the use of tile-based resolution layers. The data structure may be organized as a file and referred to as a StructureMap file or .smf file. The data structure may also be organized to support rendering on various mapping platforms, such as, for example, Google Earth. The data structure may be stored on a memory that is internal to a sonar system or a removable memory such as, for example, an SD card. When a rendering request is made, the data structure may be processed for rendering the sonar data overlaying a map.
To generate the data structure, processing of the range cell data may be performed to plot and rotate the range cell data of a sonar column as described above with respect to the processing for the Live Mode. However, in the Saved Mode, further processing of the plotted and rotated (adjusted) range cell data may be performed. In this regard, the sonar columns included in a sonar log file may be considered in the aggregate, and a grid system may be applied to the range cell data.
The range cell data located within each of the tiles may be grouped to the tile area. The tile areas may be defined in any number of ways, including, but not limited to, the tile definition provided in
As mentioned above, the actual data values stored in the tiles may be range cell data, and as such, the tiles and the data within the tiles are not yet interpreted as images. In other words, the data in the tiles need not be pixels with an applied color palette. The process to render the data of the data structure and the tiles may begin with a chart request or may occur automatically when new data structure is created. When the composite map is redrawn, an iteration over all the Saved Mode data structures may be performed to identify the data structures with geographic areas that intersect with the map. The data of the tiles inside the data structure may be given a palette and may be rotated and scaled to fit the chart view. The data of the tiles may then be drawn to the chart, with optional transparency.
According to various example embodiments, the composite map that is generated with the sonar data may be an interactive map that permits zooming and panning. In this regard, according to some example embodiments, a single top-most tile having the highest resolution may be used to render the interactive map. This is an example of an implementation with a single-resolution layer data structure that is rendered, regardless of the zoom level. However, in some example embodiments, multiple-resolution layers having differing resolutions can be generated and rendered, as needed, to increase the efficiency of user interactions with the map. To facilitate the ability to increase the efficiency of map interactions, the data structure generated for use in, for example, the Saved Mode, may include a collection of layers of range cell data that are formatted for different resolutions. In this regard, according to some example embodiments, the resolution layers may be constructed such that the resolution layers differ by half-resolution increments.
Various file formats may be used for compiling the data structure. In some example embodiments, the data structure may take the form of a file (e.g., a .smf file) that includes fields and packets. In this regard, the file may include a file header. The file header may comprise a field that identifies the file type (e.g., identifies the file as a .smf file) and thereby indicates the formatting of the file. Further, the file header may include a version field indicating a version number for the file for compatibility determinations.
The file may also include any number of data packets with each packet having a header. In this regard, each packet may begin with a common header that specifies a packet type. Upon reading the packet type, a decision may be made as to whether the remainder of the packet should be considered based upon the operation currently being performed. The size of the packet, which need not include the size of the common header, may also be provided in the common packet header. Indicating the size of the packet may allow a read operation to be aware of the end of the packet based on the packet's size. Example packet types in the file may include an overall log information type, a tile type, a spot soundings type, or a table node type.
A file may include a single overall log information packet that may be the first packet in the file. The overall log information packet may follow the file header. If the overall log information packet is not encountered at the correction location, an error indication may be issued or subsequent behavior may be undefined.
The overall log information packet may include information about the characteristics of the sonar log file. In this regard, the overall log information packet may include fields for indicating center coordinates for the sonar data in the log file, a length and width of the grid that encompasses the sonar data in the log file, and the size (e.g., width, or width and length) of the tiles indicating the number of cells in a tile. The overall log information packet may also include an indicator of the highest resolution layer, and the number of resolution layers. The overall log information packet may also include a byte offset value for use in determining where a tile tree table can be located in the file.
The file may also include one or more tile packets. The payload of the tile packets may be the tile data (e.g., the range cell data for the tile). The payload may be compressed using various techniques. The tile packet may also include a field indicating a tile identifier, coordinates for the tile center, an indication of the size of the data in the tile, and a resolution value for the tile.
The file may further include spot sounding packets. Each spot sounding packet may include an indication of a number of soundings in the packet. For each sounding, the packet may include coordinates indicating the location of the sounding and a depth value.
Additionally, the file may include table node packets. A first table node packet may be a master node that represents the lowest resolution layer, which may be a single tile layer that includes data from the entire log file. If there are children nodes from a table node packet, then those nodes may be read thereafter to determine the architecture of the table. As such, the table node packets may include various fields such as a tile center indicating the coordinates of the center, a tile width (and length), a resolution value, a file offset of the tile indicating the start of the common header, and the number of children table node packets.
Having generally described the process of converting the range cell data into a data structure, such as the file structure described above,
At 1520, each tile in the current resolution layer may be processed. Processing of the tiles may include attempting to render the range cell data in the sonar log file. If the attempt to render the range cell data in the cell is successful, then the data may be saved in association with the tile. In this regard, the groups of range cell data may be separately stored based on the boundaries of the tiles. The characteristics of the tile may be stored for consideration when building a table node tree. A tile header may be saved with the data for the cell. If no data is present in the cell, no further operations with respect to that tile need to be performed.
At 1530, a determination may be made as to whether the current resolution layer includes data in more than one tile. If so, then the resolution of the range cell data for the current layer may be reduced by one half at 1540, and a new resolution layer may be considered. In this regard, for example, when a determination of the number of tiles for the new resolution layer is determined at 1510, the number of tiles on each side of the grid for the new resolution layer would be reduced by one-half of the number of tiles on the respective sides of the previous resolution layer.
This process may be repeated until the current resolution layer includes only one tile. When the single tile resolution layer is considered, then processing of the sonar log file is complete and the node table indicating the relationships between the tiles may be constructed and saved at 1550. Subsequently, the process may end at 1560.
Rendering the sonar image data of Saved Mode data structure may be performed in various ways. For example, sonar image data may be rendered with the presentation of a geographic map where the sonar image data is the derived from range cell data of a tile associated with one of the plurality of resolution layers of a data structure. Further, based on a resolution of the presentation of the geographic map, one of the plurality of resolution layers may be selected for rendering. The node tree indicative of an architecture of the resolution layers and tiles of the data structure may also be used in the selection of a resolution layer. According to some example embodiments, the adjusted range cell data with a tile to be rendered may be scaled and oriented based on an orientation and zoom level of the presentation of the geographic map. A color palette may also be applied to the range cell data of tile to be rendered. The coloring of the range cell data may impart information indicating a density of echo returns at a location of the range cell data of the given tile.
At 1610, a determination may be made as to whether the data meets specific criteria for rendering. In this regard, for example, an analysis of the geo-location of the data may be performed to determine if any of the data intersects with the currently requested map or a portion of the map presented on a display. Similarly, an analysis of the master node representative of the single tile resolution layer may be performed to determine if the boundaries of the master node intersect with the currently requested map or a portion of the map presented on a display. If the data fails one or more of the criteria, then the rendering process may be ended.
However, if the criteria are met, then a determination of which resolution layer to render may be made at 1620. In this regard, a resolution of the map may be determined and a resolution layer having a resolution that is greater than or equal to the resolution of the map may be used. In some instances, the resolution layer having the highest resolution may be used because no higher resolution layer may be available. When the proper resolution layer is determined, the data for a tile within the resolution layer may be loaded. To do so, the offset given by an associated child node may be used to retrieve the data. At the location indicated by the offset, a common header and a tile packet may be located. Additionally, other related packets may be found following the tile packet. For example, a spot sounding packet may follow. Further, in an instance where a tile that is being analyzed is not at the proper resolution, then an analysis of a child tile may be performed and an intersection of the tile with the map may be made as described at 1610 and the process may continue from that point with respect to each child tile. Further, this process may continue in a recursive manner.
After loading the data of the tile, palette colors may be applied to the range cell data in the tile at 1630. Further, the data may be scaled and oriented as appropriate for rendering on the map. At 1640, the representation of the sonar data may be rendered with the map as provided, for example, in
Many modifications and other embodiments of the inventions set forth herein will come to mind to one skilled in the art to which these embodiments pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the inventions are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
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| Number | Date | Country | |
|---|---|---|---|
| 20130148471 A1 | Jun 2013 | US |
