Swath Data File: tahoe_98_279.0.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: 3853 Bathymetry Data (121 beams): Number of Beams: 466213 Number of Good Beams: 230576 49.46% Number of Zero Beams: 235637 50.54% Number of Flagged Beams: 0 0.00% Amplitude Data (121 beams): Number of Beams: 466213 Number of Good Beams: 230576 49.46% Number of Zero Beams: 235637 50.54% Number of Flagged Beams: 0 0.00% Sidescan Data (1024 pixels): Number of Pixels: 3945472 Number of Good Pixels: 2428241 61.55% Number of Zero Pixels: 0 0.00% Number of Flagged Pixels: 1517231 38.45% Navigation Totals: Total Time: 0.2756 hours Total Track Length: 3.2966 km Average Speed: 11.9623 km/hr ( 6.4661 knots) Start of Data: Time: 08 15 1998 19:36:05.560000 JD227 Lon: -119.9556 Lat: 39.0385 Depth: 21.7800 meters Speed: 144689935.4896 km/hr (78210775.9404 knots) Heading: 38.6000 degrees Sonar Depth: 0.0100 m Sonar Altitude: 21.7500 m End of Data: Time: 08 15 1998 19:52:37.650000 JD227 Lon: -119.9508 Lat: 39.0674 Depth: 10.8600 meters Speed: 11.4774 km/hr ( 6.2040 knots) Heading: 305.2000 degrees Sonar Depth: -0.0500 m Sonar Altitude: 10.9100 m Limits: Minimum Longitude: -119.9563 Maximum Longitude: -119.9488 Minimum Latitude: 39.0381 Maximum Latitude: 39.0677 Minimum Sonar Depth: -0.1400 Maximum Sonar Depth: 0.1600 Minimum Altitude: 8.4100 Maximum Altitude: 22.3800 Minimum Depth: 6.6400 Maximum Depth: 33.0600 Minimum Amplitude: -58.5000 Maximum Amplitude: -2.5000 Minimum Sidescan: -64.0000 Maximum Sidescan: 55.5000 Data Record Type Notices: DN: 3871 MB_DATA_DATA (ID=1): survey data DN: 1941 MB_DATA_NAV (ID=12): Navigation record Nonfatal Error Notices: EN: 18 MB_ERROR_OUT_BOUNDS (ID=-2): Data outside specified location bounds EN: 1941 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: 42 DATA PROBLEM (ID=3): Instantaneous speed exceeds 25 km/hr Coverage Mask: CM dimensions: 10 10 CM: 0 0 0 0 0 0 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 1 1 1 1 0 CM: 0 0 0 0 0 1 1 1 1 0 CM: 0 0 0 0 0 1 1 1 1 0 CM: 0 0 0 1 1 1 1 1 0 0 CM: 0 0 1 1 1 1 1 0 0 0 CM: 0 0 1 1 1 1 0 0 0 0 CM: 1 1 1 1 1 0 0 0 0 0