Swath Data File: tahoe_98_88.0.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: 1454 Bathymetry Data (121 beams): Number of Beams: 175934 Number of Good Beams: 81532 46.34% Number of Zero Beams: 94402 53.66% Number of Flagged Beams: 0 0.00% Amplitude Data (121 beams): Number of Beams: 175934 Number of Good Beams: 81532 46.34% Number of Zero Beams: 94402 53.66% Number of Flagged Beams: 0 0.00% Sidescan Data (1024 pixels): Number of Pixels: 1488896 Number of Good Pixels: 762136 51.19% Number of Zero Pixels: 0 0.00% Number of Flagged Pixels: 726760 48.81% Navigation Totals: Total Time: 0.1995 hours Total Track Length: 2.4997 km Average Speed: 12.5279 km/hr ( 6.7719 knots) Start of Data: Time: 08 09 1998 21:50:55.390000 JD221 Lon: -120.0922 Lat: 39.1803 Depth: 13.7400 meters Speed: 101263373.1473 km/hr (54736958.4580 knots) Heading: 1.2000 degrees Sonar Depth: 0.0100 m Sonar Altitude: 13.7500 m End of Data: Time: 08 09 1998 22:02:53.710000 JD221 Lon: -120.0847 Lat: 39.1989 Depth: 36.5200 meters Speed: 11.4801 km/hr ( 6.2055 knots) Heading: 79.2000 degrees Sonar Depth: 0.0500 m Sonar Altitude: 36.4700 m Limits: Minimum Longitude: -120.0942 Maximum Longitude: -120.0844 Minimum Latitude: 39.1803 Maximum Latitude: 39.2000 Minimum Sonar Depth: -0.1500 Maximum Sonar Depth: 0.1500 Minimum Altitude: -0.0400 Maximum Altitude: 59.6900 Minimum Depth: 3.3200 Maximum Depth: 167.0200 Minimum Amplitude: -64.0000 Maximum Amplitude: -1.5000 Minimum Sidescan: -64.0000 Maximum Sidescan: 43.0000 Data Record Type Notices: DN: 1454 MB_DATA_DATA (ID=1): survey data DN: 1435 MB_DATA_NAV (ID=12): Navigation record Nonfatal Error Notices: EN: 1435 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: 1 DATA PROBLEM (ID=3): Instantaneous speed exceeds 25 km/hr Coverage Mask: CM dimensions: 10 10 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 0 0 CM: 1 1 1 1 1 1 1 0 0 0 CM: 1 1 1 1 1 1 0 0 0 0 CM: 1 1 1 1 1 0 0 0 0 0 CM: 1 1 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: 0 1 1 1 1 0 0 0 0 0