Swath Data File: tahoe_98_361.0.em1000.mb51 MBIO Data Format ID: 51 Format name: MBF_EMOLDRAW Informal Description: Old Simrad vendor multibeam format Attributes: Simrad EM1000, EM12S, EM12D, and EM121 multibeam sonars, bathymetry, amplitude, and sidescan, 60 beams for EM1000, 81 beams for EM12S/D, 121 beams for EM121, variable pixels, ascii + binary, Simrad. Data Totals: Number of Records: 908 Bathymetry Data (121 beams): Number of Beams: 109868 Number of Good Beams: 54152 49.29% Number of Zero Beams: 55716 50.71% Number of Flagged Beams: 0 0.00% Amplitude Data (121 beams): Number of Beams: 109868 Number of Good Beams: 54152 49.29% Number of Zero Beams: 55716 50.71% Number of Flagged Beams: 0 0.00% Sidescan Data (1024 pixels): Number of Pixels: 929792 Number of Good Pixels: 640531 68.89% Number of Zero Pixels: 0 0.00% Number of Flagged Pixels: 289261 31.11% Navigation Totals: Total Time: 0.1589 hours Total Track Length: 1.9752 km Average Speed: 12.4326 km/hr ( 6.7203 knots) Start of Data: Time: 08 16 1998 20:44:57.020000 JD228 Lon: -120.0937 Lat: 39.1545 Depth: 46.2800 meters Speed: 0.0000 km/hr ( 0.0000 knots) Heading: 214.8000 degrees Sonar Depth: 0.0800 m Sonar Altitude: 46.2000 m End of Data: Time: 08 16 1998 20:54:28.960000 JD228 Lon: -120.1019 Lat: 39.1380 Depth: 96.4800 meters Speed: 12.3873 km/hr ( 6.6959 knots) Heading: 196.8000 degrees Sonar Depth: 0.0200 m Sonar Altitude: 96.4600 m Limits: Minimum Longitude: -120.1046 Maximum Longitude: -120.0903 Minimum Latitude: 39.1367 Maximum Latitude: 39.1550 Minimum Sonar Depth: -0.2000 Maximum Sonar Depth: 0.2100 Minimum Altitude: 40.5900 Maximum Altitude: 96.4600 Minimum Depth: 27.9000 Maximum Depth: 169.8600 Minimum Amplitude: -58.5000 Maximum Amplitude: -7.0000 Minimum Sidescan: -64.0000 Maximum Sidescan: 20.7500 Data Record Type Notices: DN: 908 MB_DATA_DATA (ID=1): survey data DN: 1143 MB_DATA_NAV (ID=12): Navigation record Nonfatal Error Notices: EN: 1143 MB_ERROR_OTHER (ID=-8): Neither a data record nor a comment record Problem Notices: PN: 4 DATA PROBLEM (ID=3): Instantaneous speed exceeds 25 km/hr Coverage Mask: CM dimensions: 10 10 CM: 0 0 0 0 0 1 1 1 1 1 CM: 0 0 0 0 0 1 1 1 1 1 CM: 0 0 0 0 1 1 1 1 1 1 CM: 0 0 0 1 1 1 1 1 0 0 CM: 0 0 1 1 1 1 1 0 0 0 CM: 0 0 1 1 1 1 1 0 0 0 CM: 0 1 1 1 1 1 1 1 0 0 CM: 1 1 1 1 1 1 0 1 1 0 CM: 1 1 1 1 1 1 0 0 0 0 CM: 1 1 1 1 1 1 0 0 0 0