All sidescan-sonar data were processed using USGS sidescan-sonar processing software packages XSonar and ShowImage. A median filtering routine was applied to the sidescan-sonar data to remove speckle noise, resulting in a 0.06-m pixel size. TVG was applied to sonar data collected on Julian Day 118 and 133 (year 2004), as the dynamic range of these data were low. Sonar data were further processed to correct for slant-range and radiometric distortion inherent in the sonar data. All processed data were mosaicked using XSonar, resulting in an enhanced, geographically correct, sidescan-sonar mosaic with 1 meter/pixel resolution. The composite mosaic was converted to a TIFF image using the following LINUX commands:
rawtopgm -headerskip 80 11000 9000 mosaic.ras | pnmtotiff - > mosaic.tif
An associated TIF world file was then created using LINUX 'vi'.