Swath Data File: tahoe_98_62.0.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: 2984 Bathymetry Data (121 beams): Number of Beams: 361064 Number of Good Beams: 133523 36.98% Number of Zero Beams: 227541 63.02% Number of Flagged Beams: 0 0.00% Amplitude Data (121 beams): Number of Beams: 361064 Number of Good Beams: 133523 36.98% Number of Zero Beams: 227541 63.02% Number of Flagged Beams: 0 0.00% Sidescan Data (1024 pixels): Number of Pixels: 3055616 Number of Good Pixels: 1414585 46.29% Number of Zero Pixels: 0 0.00% Number of Flagged Pixels: 1641031 53.71% Navigation Totals: Total Time: 1.1102 hours Total Track Length: 11.4684 km Average Speed: 10.3304 km/hr ( 5.5840 knots) Start of Data: Time: 08 08 1998 22:22:27.080000 JD220 Lon: -120.0683 Lat: 39.1709 Depth: 441.9000 meters Speed: 31891028.8798 km/hr (17238393.9891 knots) Heading: 165.8000 degrees Sonar Depth: 0.0600 m Sonar Altitude: 442.1600 m End of Data: Time: 08 08 1998 23:29:03.690000 JD220 Lon: -120.0760 Lat: 39.0711 Depth: 451.2000 meters Speed: 10.3461 km/hr ( 5.5925 knots) Heading: 188.8000 degrees Sonar Depth: 0.0400 m Sonar Altitude: 451.1600 m Limits: Minimum Longitude: -120.0883 Maximum Longitude: -120.0574 Minimum Latitude: 39.0699 Maximum Latitude: 39.1725 Minimum Sonar Depth: -0.4100 Maximum Sonar Depth: 186.8700 Minimum Altitude: -0.2900 Maximum Altitude: 517.3500 Minimum Depth: 218.1200 Maximum Depth: 536.7400 Minimum Amplitude: -64.0000 Maximum Amplitude: -4.0000 Minimum Sidescan: -64.0000 Maximum Sidescan: 19.6600 Data Record Type Notices: DN: 2984 MB_DATA_DATA (ID=1): survey data DN: 7902 MB_DATA_NAV (ID=12): Navigation record Nonfatal Error Notices: EN: 7902 MB_ERROR_OTHER (ID=-8): Neither a data record nor a comment record EN: 1 MB_ERROR_NOT_ENOUGH_DATA (ID=-21): Not enough data to perform spline interpolation Problem Notices: PN: 1 DATA PROBLEM (ID=2): Zero longitude or latitude in survey data PN: 5 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 1 1 CM: 0 0 0 1 1 1 1 1 1 1 CM: 0 0 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 1 1 1 0 0 0 0 CM: 1 1 1 1 1 1 0 0 0 0 CM: 1 1 1 1 1 1 1 0 0 0 CM: 0 1 1 1 1 1 1 0 0 0 CM: 0 1 1 1 1 1 1 0 0 0