More information about the individual USGS surveys conducted as part of the northern Cape Cod Bay project can be found on the Woods Hole Coastal and Marine Science Center Field Activity webpage:
06012: <http://quashnet.er.usgs.gov/data/2006/06012/> 07001: <http://quashnet.er.usgs.gov/data/2007/07001/> 07002: <http://quashnet.er.usgs.gov/data/2007/07002/> 07003: <http://quashnet.er.usgs.gov/data/2007/07003/> 08002: <http://quashnet.er.usgs.gov/data/2008/08002/>
Field activities 07001 and 08002: The Klein 3000 towfish was deployed from a davit on the port side aft on the R/V Rafael. Real-time kinematic (RTK) GPS navigation data were provided by an Ashtech Z-Surveyor Extreme receiver and recorded to the raw data files (XTF) via the Klein SonarPro (version 9.6 and 10.0) acquisition software. A conservative estimate of positional accuracy is ± 10 m, but when the navigation system was providing the "fixed" RTK signal, positional accuracy is likely <1 m.
Acoustic backscatter data acquisition for field activities 07001 and 08002: The Klein 3000 towfish was deployed from a davit on the port side of the R/V Rafael approximately 1 m astern and 0.5 m below the water surface. These data were acquired using a 75-100 m range(150-200 m total width).
1) The rectified mosaic (*.pix) files from 07001 and 08002 were added to the new mosaic.
2) The rectified mosaic (*.pix) files for 06012 and 07002 were mosaiced together in PCI (CCB_offshore.pix) and then exported to a GeoTIFF (CCB_offshore.tif). The 8-bit range of the image (color stretch) was adjusted to visually match the inshore backscatter data in CCB_Klein_bs_1m.pix.
3) The color adjusted GeoTIFF (CCB_offshore_Adj.tif) was imported back into PCI and mosaicked into the CCB_Klein_bs_1m.pix file to generate a 1-m mosaic of Klein data.
4) The final mosaic (CCB_Klein_bs_1m.pix) was exported to a GeoTIFF (CCB_Klein_bs_1m.tif). A TIFF world file (tfw) was generated for the GeoTIFF using GeoTIFFExaminer (no version).