Swath Data File: tahoe_98_54.0.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: 46 Bathymetry Data (121 beams): Number of Beams: 5566 Number of Good Beams: 2199 39.51% Number of Zero Beams: 3367 60.49% Number of Flagged Beams: 0 0.00% Amplitude Data (121 beams): Number of Beams: 5566 Number of Good Beams: 2199 39.51% Number of Zero Beams: 3367 60.49% Number of Flagged Beams: 0 0.00% Sidescan Data (1024 pixels): Number of Pixels: 47104 Number of Good Pixels: 23173 49.20% Number of Zero Pixels: 0 0.00% Number of Flagged Pixels: 23931 50.80% Navigation Totals: Total Time: 0.0174 hours Total Track Length: 0.2142 km Average Speed: 12.3289 km/hr ( 6.6643 knots) Start of Data: Time: 08 08 1998 15:36:32.460000 JD220 Lon: -120.0238 Lat: 39.0557 Depth: 462.5400 meters Speed: 0.0000 km/hr ( 0.0000 knots) Heading: 172.6000 degrees Sonar Depth: -0.0300 m Sonar Altitude: 462.5700 m End of Data: Time: 08 08 1998 15:37:35.010000 JD220 Lon: -120.0236 Lat: 39.0540 Depth: 457.9400 meters Speed: 12.5201 km/hr ( 6.7676 knots) Heading: 174.7000 degrees Sonar Depth: -0.0300 m Sonar Altitude: 457.9700 m Limits: Minimum Longitude: -120.0324 Maximum Longitude: -120.0150 Minimum Latitude: 39.0533 Maximum Latitude: 39.0566 Minimum Sonar Depth: 0.0000 Maximum Sonar Depth: 0.0000 Minimum Altitude: 457.9700 Maximum Altitude: 462.6200 Minimum Depth: 445.2000 Maximum Depth: 466.3000 Minimum Amplitude: -50.0000 Maximum Amplitude: -15.5000 Minimum Sidescan: -64.0000 Maximum Sidescan: -21.3500 Data Record Type Notices: DN: 46 MB_DATA_DATA (ID=1): survey data DN: 129 MB_DATA_NAV (ID=12): Navigation record Nonfatal Error Notices: EN: 129 MB_ERROR_OTHER (ID=-8): Neither a data record nor a comment record Problem Notices: Coverage Mask: CM dimensions: 10 10 CM: 0 0 0 0 0 0 0 1 1 1 CM: 0 0 0 0 0 0 1 1 1 1 CM: 0 0 0 0 1 1 1 1 1 1 CM: 0 1 1 1 1 1 1 1 1 1 CM: 1 1 1 1 1 1 1 1 1 1 CM: 1 1 1 1 1 1 1 1 1 1 CM: 1 1 1 1 1 1 1 1 1 1 CM: 1 1 1 1 1 1 1 1 0 0 CM: 1 1 1 1 1 1 0 0 0 0 CM: 1 1 1 0 0 0 0 0 0 0