Swath Data File: tahoe_98_374.0.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: 748 Bathymetry Data (121 beams): Number of Beams: 90508 Number of Good Beams: 44684 49.37% Number of Zero Beams: 45824 50.63% Number of Flagged Beams: 0 0.00% Amplitude Data (121 beams): Number of Beams: 90508 Number of Good Beams: 44684 49.37% Number of Zero Beams: 45824 50.63% Number of Flagged Beams: 0 0.00% Sidescan Data (1024 pixels): Number of Pixels: 765952 Number of Good Pixels: 418688 54.66% Number of Zero Pixels: 0 0.00% Number of Flagged Pixels: 347264 45.34% Navigation Totals: Total Time: 0.0518 hours Total Track Length: 11256.6302 km Average Speed: 217297.8110 km/hr (117458.2762 knots) Start of Data: Time: 08 16 1998 23:22:11.240000 JD228 Lon: -120.1240 Lat: 39.1594 Depth: 14.8200 meters Speed: 0.0000 km/hr ( 0.0000 knots) Heading: 285.0000 degrees Sonar Depth: 0.0100 m Sonar Altitude: 14.8100 m End of Data: Time: 08 16 1998 23:25:17.730000 JD228 Lon: -120.1312 Lat: 39.1615 Depth: 12.4600 meters Speed: 12.5014 km/hr ( 6.7575 knots) Heading: 300.5000 degrees Sonar Depth: 0.0200 m Sonar Altitude: 12.4400 m Limits: Minimum Longitude: -120.1315 Maximum Longitude: -120.1238 Minimum Latitude: 39.1589 Maximum Latitude: 39.1618 Minimum Sonar Depth: -0.2200 Maximum Sonar Depth: 0.1800 Minimum Altitude: 11.5500 Maximum Altitude: 15.1900 Minimum Depth: 11.1000 Maximum Depth: 21.5400 Minimum Amplitude: -51.5000 Maximum Amplitude: -7.0000 Minimum Sidescan: -64.0000 Maximum Sidescan: 62.0000 Data Record Type Notices: DN: 748 MB_DATA_DATA (ID=1): survey data DN: 372 MB_DATA_NAV (ID=12): Navigation record Nonfatal Error Notices: EN: 1 MB_ERROR_TIME_GAP (ID=-1): Time gap in data EN: 372 MB_ERROR_OTHER (ID=-8): Neither a data record nor a comment record EN: 2 MB_ERROR_NOT_ENOUGH_DATA (ID=-21): Not enough data to perform spline interpolation Problem Notices: PN: 2 DATA PROBLEM (ID=2): Zero longitude or latitude in survey data PN: 1 DATA PROBLEM (ID=4): Average speed exceeds 25 km/hr Coverage Mask: CM dimensions: 10 10 CM: 1 1 0 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 1 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 1 1 1 1 CM: 0 0 0 0 0 0 0 0 1 1