Swath Data File: tahoe_98_65.0.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: 1292 Bathymetry Data (121 beams): Number of Beams: 156332 Number of Good Beams: 59859 38.29% Number of Zero Beams: 96473 61.71% Number of Flagged Beams: 0 0.00% Amplitude Data (121 beams): Number of Beams: 156332 Number of Good Beams: 59859 38.29% Number of Zero Beams: 96473 61.71% Number of Flagged Beams: 0 0.00% Sidescan Data (1024 pixels): Number of Pixels: 1323008 Number of Good Pixels: 586312 44.32% Number of Zero Pixels: 0 0.00% Number of Flagged Pixels: 736696 55.68% Navigation Totals: Total Time: 0.2387 hours Total Track Length: 2.8679 km Average Speed: 12.0169 km/hr ( 6.4956 knots) Start of Data: Time: 08 09 1998 00:22:08.250000 JD221 Lon: -120.0987 Lat: 39.1349 Depth: 187.1200 meters Speed: 0.0000 km/hr ( 0.0000 knots) Heading: 293.2000 degrees Sonar Depth: 0.0600 m Sonar Altitude: 187.0600 m End of Data: Time: 08 09 1998 00:36:27.420000 JD221 Lon: -120.1292 Lat: 39.1444 Depth: 49.7000 meters Speed: 10.8043 km/hr ( 5.8402 knots) Heading: 297.6000 degrees Sonar Depth: -0.0600 m Sonar Altitude: 49.7600 m Limits: Minimum Longitude: -120.1297 Maximum Longitude: -120.0975 Minimum Latitude: 39.1314 Maximum Latitude: 39.1451 Minimum Sonar Depth: -0.3200 Maximum Sonar Depth: 0.2500 Minimum Altitude: 49.7600 Maximum Altitude: 201.2300 Minimum Depth: 31.8000 Maximum Depth: 274.9600 Minimum Amplitude: -57.0000 Maximum Amplitude: -5.0000 Minimum Sidescan: -64.0000 Maximum Sidescan: 2.5000 Data Record Type Notices: DN: 1292 MB_DATA_DATA (ID=1): survey data DN: 1698 MB_DATA_NAV (ID=12): Navigation record Nonfatal Error Notices: EN: 1698 MB_ERROR_OTHER (ID=-8): Neither a data record nor a comment record Problem Notices: Coverage Mask: CM dimensions: 10 10 CM: 1 1 1 0 0 0 0 0 0 0 CM: 1 1 1 1 0 0 0 0 0 0 CM: 1 1 1 1 1 0 0 0 0 0 CM: 1 1 1 1 1 1 0 0 0 0 CM: 0 1 1 1 1 1 1 1 0 0 CM: 0 0 1 1 1 1 1 1 1 1 CM: 0 0 0 0 1 1 1 1 1 1 CM: 0 0 0 0 0 1 1 1 1 1 CM: 0 0 0 0 0 0 0 1 1 1 CM: 0 0 0 0 0 0 0 0 1 1