Swath Data File: tahoe_98_246.0.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: 3658 Bathymetry Data (121 beams): Number of Beams: 442618 Number of Good Beams: 216535 48.92% Number of Zero Beams: 226083 51.08% Number of Flagged Beams: 0 0.00% Amplitude Data (121 beams): Number of Beams: 442618 Number of Good Beams: 216535 48.92% Number of Zero Beams: 226083 51.08% Number of Flagged Beams: 0 0.00% Sidescan Data (1024 pixels): Number of Pixels: 3745792 Number of Good Pixels: 2128483 56.82% Number of Zero Pixels: 0 0.00% Number of Flagged Pixels: 1617309 43.18% Navigation Totals: Total Time: 0.2940 hours Total Track Length: 3.6152 km Average Speed: 12.2955 km/hr ( 6.6462 knots) Start of Data: Time: 08 15 1998 14:55:04.490000 JD227 Lon: -119.9535 Lat: 39.2379 Depth: 11.4000 meters Speed: 161785855.4234 km/hr (87451813.7424 knots) Heading: 100.1000 degrees Sonar Depth: 0.0100 m Sonar Altitude: 11.4000 m End of Data: Time: 08 15 1998 15:12:42.990000 JD227 Lon: -119.9327 Lat: 39.2135 Depth: 18.1800 meters Speed: 0.0107 km/hr ( 0.0058 knots) Heading: 167.8000 degrees Sonar Depth: -0.0200 m Sonar Altitude: 18.2000 m Limits: Minimum Longitude: -119.9536 Maximum Longitude: -119.9320 Minimum Latitude: 39.2133 Maximum Latitude: 39.2386 Minimum Sonar Depth: -0.0600 Maximum Sonar Depth: 0.0900 Minimum Altitude: -0.0100 Maximum Altitude: 32.1900 Minimum Depth: 8.1600 Maximum Depth: 90.8800 Minimum Amplitude: -62.5000 Maximum Amplitude: -5.5000 Minimum Sidescan: -64.0000 Maximum Sidescan: 44.5000 Data Record Type Notices: DN: 3674 MB_DATA_DATA (ID=1): survey data DN: 2078 MB_DATA_NAV (ID=12): Navigation record Nonfatal Error Notices: EN: 16 MB_ERROR_OUT_BOUNDS (ID=-2): Data outside specified location bounds EN: 2078 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: 23 DATA PROBLEM (ID=3): Instantaneous speed exceeds 25 km/hr Coverage Mask: CM dimensions: 10 10 CM: 1 1 1 1 0 0 0 0 0 0 CM: 0 1 1 1 1 1 1 0 0 0 CM: 0 0 0 1 1 1 1 0 0 0 CM: 0 0 0 0 0 1 1 1 0 0 CM: 0 0 0 0 0 0 1 1 0 0 CM: 0 0 0 0 0 0 1 1 1 0 CM: 0 0 0 0 0 0 0 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