Swath Data File: tahoe_98_291.0.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: 809 Bathymetry Data (121 beams): Number of Beams: 97889 Number of Good Beams: 42477 43.39% Number of Zero Beams: 55412 56.61% Number of Flagged Beams: 0 0.00% Amplitude Data (121 beams): Number of Beams: 97889 Number of Good Beams: 42477 43.39% Number of Zero Beams: 55412 56.61% Number of Flagged Beams: 0 0.00% Sidescan Data (1024 pixels): Number of Pixels: 828416 Number of Good Pixels: 334670 40.40% Number of Zero Pixels: 0 0.00% Number of Flagged Pixels: 493746 59.60% Navigation Totals: Total Time: 0.1682 hours Total Track Length: 1.8891 km Average Speed: 11.2318 km/hr ( 6.0712 knots) Start of Data: Time: 08 15 1998 23:24:18.020000 JD227 Lon: -120.1027 Lat: 39.0059 Depth: 11.3200 meters Speed: 162265324.4615 km/hr (87710986.1954 knots) Heading: 61.2000 degrees Sonar Depth: -0.0100 m Sonar Altitude: 11.3900 m End of Data: Time: 08 15 1998 23:34:23.520000 JD227 Lon: -120.1031 Lat: 39.0064 Depth: 26.5200 meters Speed: 14.9821 km/hr ( 8.0985 knots) Heading: 190.3000 degrees Sonar Depth: 0.0600 m Sonar Altitude: 26.4600 m Limits: Minimum Longitude: -120.1057 Maximum Longitude: -120.0919 Minimum Latitude: 39.0033 Maximum Latitude: 39.0159 Minimum Sonar Depth: -0.1400 Maximum Sonar Depth: 0.1700 Minimum Altitude: 0.0100 Maximum Altitude: 121.1700 Minimum Depth: 9.9000 Maximum Depth: 244.1200 Minimum Amplitude: -64.0000 Maximum Amplitude: -2.5000 Minimum Sidescan: -64.0000 Maximum Sidescan: 63.5000 Data Record Type Notices: DN: 810 MB_DATA_DATA (ID=1): survey data DN: 1201 MB_DATA_NAV (ID=12): Navigation record Nonfatal Error Notices: EN: 1 MB_ERROR_OUT_BOUNDS (ID=-2): Data outside specified location bounds EN: 1201 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: 2 DATA PROBLEM (ID=3): Instantaneous speed exceeds 25 km/hr Coverage Mask: CM dimensions: 10 10 CM: 0 0 1 1 0 1 1 0 0 0 CM: 0 1 1 1 1 1 1 1 0 0 CM: 1 1 1 1 1 1 1 1 0 0 CM: 1 1 1 1 1 1 1 1 1 0 CM: 1 1 1 1 1 1 1 1 1 1 CM: 1 1 1 1 0 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: 0 0 1 1 1 1 1 1 1 0 CM: 0 0 0 0 1 1 1 1 1 1