Swath Data File: tahoe_98_188.0.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: 5051 Bathymetry Data (121 beams): Number of Beams: 611171 Number of Good Beams: 297634 48.70% Number of Zero Beams: 313537 51.30% Number of Flagged Beams: 0 0.00% Amplitude Data (121 beams): Number of Beams: 611171 Number of Good Beams: 297634 48.70% Number of Zero Beams: 313537 51.30% Number of Flagged Beams: 0 0.00% Sidescan Data (1024 pixels): Number of Pixels: 5172224 Number of Good Pixels: 3143906 60.78% Number of Zero Pixels: 0 0.00% Number of Flagged Pixels: 2028318 39.22% Navigation Totals: Total Time: 0.8624 hours Total Track Length: 10.4210 km Average Speed: 12.0842 km/hr ( 6.5320 knots) Start of Data: Time: 08 12 1998 21:00:46.480000 JD224 Lon: -119.9378 Lat: 39.1903 Depth: 28.2400 meters Speed: 0.0000 km/hr ( 0.0000 knots) Heading: 2.7000 degrees Sonar Depth: 0.0300 m Sonar Altitude: 28.2100 m End of Data: Time: 08 12 1998 21:52:31.010000 JD224 Lon: -119.9980 Lat: 39.2397 Depth: 22.6200 meters Speed: 11.9891 km/hr ( 6.4806 knots) Heading: 172.0000 degrees Sonar Depth: -0.0100 m Sonar Altitude: 22.6300 m Limits: Minimum Longitude: -119.9989 Maximum Longitude: -119.9326 Minimum Latitude: 39.1903 Maximum Latitude: 39.2475 Minimum Sonar Depth: -0.1500 Maximum Sonar Depth: 0.1400 Minimum Altitude: 0.0300 Maximum Altitude: 107.7600 Minimum Depth: 9.5400 Maximum Depth: 227.9200 Minimum Amplitude: -64.0000 Maximum Amplitude: -0.5000 Minimum Sidescan: -64.0000 Maximum Sidescan: 8.0000 Data Record Type Notices: DN: 5051 MB_DATA_DATA (ID=1): survey data DN: 6210 MB_DATA_NAV (ID=12): Navigation record Nonfatal Error Notices: EN: 6210 MB_ERROR_OTHER (ID=-8): Neither a data record nor a comment record Problem Notices: PN: 1 DATA PROBLEM (ID=3): Instantaneous speed exceeds 25 km/hr Coverage Mask: CM dimensions: 10 10 CM: 1 1 1 1 1 0 0 0 0 0 CM: 1 1 1 1 1 1 1 1 0 0 CM: 0 0 0 0 0 1 1 1 1 0 CM: 0 0 0 0 0 0 0 1 1 1 CM: 0 0 0 0 0 0 0 0 1 1 CM: 0 0 0 0 0 0 0 0 1 1 CM: 0 0 0 0 0 0 0 0 1 1 CM: 0 0 0 0 0 0 0 0 1 1 CM: 0 0 0 0 0 0 0 0 1 1 CM: 0 0 0 0 0 0 0 0 1 1