Swath Data File: tahoe_98_46.0.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: 501 Bathymetry Data (121 beams): Number of Beams: 60621 Number of Good Beams: 18703 30.85% Number of Zero Beams: 41918 69.15% Number of Flagged Beams: 0 0.00% Amplitude Data (121 beams): Number of Beams: 60621 Number of Good Beams: 18703 30.85% Number of Zero Beams: 41918 69.15% Number of Flagged Beams: 0 0.00% Sidescan Data (1024 pixels): Number of Pixels: 513024 Number of Good Pixels: 190106 37.06% Number of Zero Pixels: 0 0.00% Number of Flagged Pixels: 322918 62.94% Navigation Totals: Total Time: 0.1961 hours Total Track Length: 1.6107 km Average Speed: 8.2125 km/hr ( 4.4392 knots) Start of Data: Time: 08 07 1998 23:13:29.510000 JD219 Lon: -120.0102 Lat: 39.2031 Depth: 256.1600 meters Speed: 0.0000 km/hr ( 0.0000 knots) Heading: 200.9000 degrees Sonar Depth: 0.0000 m Sonar Altitude: 256.1600 m End of Data: Time: 08 07 1998 23:25:15.570000 JD219 Lon: -120.0203 Lat: 39.1912 Depth: 380.3000 meters Speed: 6.4203 km/hr ( 3.4704 knots) Heading: 214.4000 degrees Sonar Depth: -0.2100 m Sonar Altitude: 380.5100 m Limits: Minimum Longitude: -120.0242 Maximum Longitude: -120.0027 Minimum Latitude: 39.1866 Maximum Latitude: 39.2042 Minimum Sonar Depth: -0.6300 Maximum Sonar Depth: 0.6500 Minimum Altitude: -0.6500 Maximum Altitude: 428.5900 Minimum Depth: 164.0600 Maximum Depth: 528.8000 Minimum Amplitude: -62.0000 Maximum Amplitude: -6.0000 Minimum Sidescan: -64.0000 Maximum Sidescan: -6.0000 Data Record Type Notices: DN: 502 MB_DATA_DATA (ID=1): survey data DN: 1403 MB_DATA_NAV (ID=12): Navigation record Nonfatal Error Notices: EN: 1 MB_ERROR_OUT_BOUNDS (ID=-2): Data outside specified location bounds EN: 1403 MB_ERROR_OTHER (ID=-8): Neither a data record nor a comment record Problem Notices: PN: 1 DATA PROBLEM (ID=3): Instantaneous speed exceeds 25 km/hr Coverage Mask: CM dimensions: 10 10 CM: 0 0 0 0 1 1 1 1 0 0 CM: 0 0 0 1 1 1 1 1 1 1 CM: 0 0 1 1 1 1 1 1 1 1 CM: 0 0 1 1 1 1 1 1 1 1 CM: 0 1 1 1 1 1 1 1 1 0 CM: 1 1 1 1 1 1 1 1 1 0 CM: 1 1 1 1 1 1 1 1 0 0 CM: 0 1 1 1 1 1 1 1 0 0 CM: 0 0 1 1 1 1 1 0 0 0 CM: 0 0 0 1 1 1 0 0 0 0