The movies are quite short, the longest should take no more than 1 minute to download over a reasonable Internet connection, be patient.
SideScan Signal levels in MosaicOne are automatically mapped in dB relative to a computed 0dB level for the entire mosaic. This means that no part of the mosaic will ever be completely "black" (zero signal) or completely "white" (max signal). This is important, especially for modern sidescan sonars with a large dynamic range of signal levels.
Sample Images:
Above: Intensity based imagery, carefully adjusted to show both the highest (white) and lowest (black) signal levels.
Below: The same data in a dB based image, the levels were picked automatically by MosaicOne. The darker (low signal) areas are much clearer but preserve the detail in the lighter (high signal) parts of the image.
Note: the upper, Intensity image was created by the Triton Isis mosaicing engine and saved as a DDS_VIF (TritonMap) file, MosaicOne retains the ability to load and display this image type.
Many side scan sonars collect data in short files, especially remotely operated or autonomous vehicles (AUVs, ASVs). When creating a mosaic the discontinuities cause the image to be broken at the start and end of these files. MosaicOne has an automatic feature that allows to user to select a number of XTF files and join them into one continuous file:
Click the image to view a short movie of the process.
It is often necessary to re-track the first return in an XTF file for accurate slant-range correction, in MosaicOne it is possible to review the whole file, zooming in to re-track a part of the file, either automatically or manually.
Click the image to view a short movie of the necessary steps.
Interactive, fine user control of the TVG curve used to generate the mosaic image. The waterfall is used initially to generate an XML file that defines the TVG curve to be used, the file is then called during the mosaicing process to correct the mosaic.
Click the image to view a movie of the TVG feature in action,
A feature that allows the user to unmerge a line of data from a side scan mosaic image, move its position to align with a known seabed feature, determine the exact X and Y shift and re-merge the line into the mosaic. The offsets of each line relative to their original position is maintained. All such offsets can later be reset to their original position if necessary.
Click the image to view a short movie of the Line Move Tool
When a mosaic is created links back to the original raw data (.XTF) files can be maintained as part of the project. In that case the user can review the raw data interactively for any part of the mosaic, either by playing the data back in the waterfall or by moving the small "pipper" to any part of the mosiac.
Click the image to see a short movie of the interactive waterfall display.
Export any image created in Perspective directly to a KML file for import to Google Earth:
Reson 7125 data from Shallow2008 survey (click for movie)
There is an automatic feature in MosaicOne called AutoFlip that detects the line direction and chooses the appropriate channel (port or starboard) to add to the mosaic image, click the image to see a short demo of the effect:
Most side scan sonars have at least 2 channels Port and Starboard. Surveys always allow some overlap between adjacent lines, however in the area of the overlap objects end up have two shadows which creates a confusing image. If there is sufficient overlap between lines it may be possible to improve the quality of a mosaic by only using one channel, alternating the channel to be used depending on the line direction. The resulting mosaic is ensonified or illuminated from one direction only. This removes the potentially confusing conflict with overlapping acoustic shadows from adjacent survey lines. Also some seabed textures (for example sand ripples) can appear very differently when illuminated from different directions due to the steeper slope on one side of a typical sand ripple.
The Custom Cursor feature allows the readout of a position in the main map window in any supported coordinate system. (Click the image for a short movie)
