Swath Data File: tahoe_98_76.0.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: 336 Bathymetry Data (121 beams): Number of Beams: 40656 Number of Good Beams: 18788 46.21% Number of Zero Beams: 21868 53.79% Number of Flagged Beams: 0 0.00% Amplitude Data (121 beams): Number of Beams: 40656 Number of Good Beams: 18788 46.21% Number of Zero Beams: 21868 53.79% Number of Flagged Beams: 0 0.00% Sidescan Data (1024 pixels): Number of Pixels: 344064 Number of Good Pixels: 191321 55.61% Number of Zero Pixels: 0 0.00% Number of Flagged Pixels: 152743 44.39% Navigation Totals: Total Time: 0.0919 hours Total Track Length: 1.0937 km Average Speed: 11.8987 km/hr ( 6.4317 knots) Start of Data: Time: 08 09 1998 16:04:34.000000 JD221 Lon: -120.1180 Lat: 39.0821 Depth: 83.0400 meters Speed: 66467921.5633 km/hr (35928606.2505 knots) Heading: 127.5000 degrees Sonar Depth: -0.0300 m Sonar Altitude: 84.4300 m End of Data: Time: 08 09 1998 16:10:04.900000 JD221 Lon: -120.1115 Lat: 39.0745 Depth: 49.5800 meters Speed: 11.8185 km/hr ( 6.3884 knots) Heading: 173.6000 degrees Sonar Depth: 0.0200 m Sonar Altitude: 49.5600 m Limits: Minimum Longitude: -120.1199 Maximum Longitude: -120.1086 Minimum Latitude: 39.0744 Maximum Latitude: 39.0858 Minimum Sonar Depth: -0.0700 Maximum Sonar Depth: 0.0800 Minimum Altitude: 25.9700 Maximum Altitude: 84.4300 Minimum Depth: 19.1800 Maximum Depth: 283.9800 Minimum Amplitude: -62.0000 Maximum Amplitude: -4.5000 Minimum Sidescan: -64.0000 Maximum Sidescan: -0.7500 Data Record Type Notices: DN: 336 MB_DATA_DATA (ID=1): survey data DN: 668 MB_DATA_NAV (ID=12): Navigation record Nonfatal Error Notices: EN: 668 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 0 0 0 0 1 1 1 CM: 0 0 1 0 1 1 0 0 1 0 CM: 0 1 1 1 1 1 1 0 0 0 CM: 1 1 1 1 1 1 1 0 0 0 CM: 1 1 1 1 1 1 1 1 1 0 CM: 0 0 0 1 1 1 1 1 1 0 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 1 1 1 1 1 CM: 0 0 0 0 0 0 1 1 1 1