Swath Data File: tahoe_98_13.0.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: 3930 Bathymetry Data (121 beams): Number of Beams: 475530 Number of Good Beams: 184731 38.85% Number of Zero Beams: 290799 61.15% Number of Flagged Beams: 0 0.00% Amplitude Data (121 beams): Number of Beams: 475530 Number of Good Beams: 184731 38.85% Number of Zero Beams: 290799 61.15% Number of Flagged Beams: 0 0.00% Sidescan Data (1024 pixels): Number of Pixels: 4024320 Number of Good Pixels: 1897675 47.16% Number of Zero Pixels: 0 0.00% Number of Flagged Pixels: 2126645 52.84% Navigation Totals: Total Time: 1.0807 hours Total Track Length: 15.6512 km Average Speed: 14.4824 km/hr ( 7.8283 knots) Start of Data: Time: 08 05 1998 18:40:41.290000 JD217 Lon: -119.9500 Lat: 39.1639 Depth: 287.7000 meters Speed: 0.0000 km/hr ( 0.0000 knots) Heading: 31.3000 degrees Sonar Depth: -0.0100 m Sonar Altitude: 287.7100 m End of Data: Time: 08 05 1998 19:45:31.830000 JD217 Lon: -120.0206 Lat: 39.1964 Depth: 212.4200 meters Speed: 15.1662 km/hr ( 8.1980 knots) Heading: 219.6000 degrees Sonar Depth: -0.0300 m Sonar Altitude: 212.4500 m Limits: Minimum Longitude: -120.0226 Maximum Longitude: -119.9418 Minimum Latitude: 39.1623 Maximum Latitude: 39.2400 Minimum Sonar Depth: -0.1500 Maximum Sonar Depth: 0.1000 Minimum Altitude: 0.0100 Maximum Altitude: 339.3400 Minimum Depth: 70.0200 Maximum Depth: 479.1400 Minimum Amplitude: -56.0000 Maximum Amplitude: 0.5000 Minimum Sidescan: -64.0000 Maximum Sidescan: 1.0000 Data Record Type Notices: DN: 3930 MB_DATA_DATA (ID=1): survey data DN: 2 MB_DATA_VELOCITY_PROFILE (ID=6): SVP DN: 8089 MB_DATA_NAV (ID=12): Navigation record Nonfatal Error Notices: EN: 8091 MB_ERROR_OTHER (ID=-8): Neither a data record nor a comment record Problem Notices: Coverage Mask: CM dimensions: 10 10 CM: 0 0 0 1 1 1 1 1 0 0 CM: 0 0 0 1 1 1 1 1 1 0 CM: 0 0 1 1 1 0 0 1 1 1 CM: 0 1 1 1 0 0 0 0 1 1 CM: 1 1 1 1 0 0 0 0 1 1 CM: 1 1 0 0 0 0 0 0 1 1 CM: 1 1 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