Swath Data File: tahoe_98_252.0.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: 5121 Bathymetry Data (121 beams): Number of Beams: 619641 Number of Good Beams: 298363 48.15% Number of Zero Beams: 321278 51.85% Number of Flagged Beams: 0 0.00% Amplitude Data (121 beams): Number of Beams: 619641 Number of Good Beams: 298363 48.15% Number of Zero Beams: 321278 51.85% Number of Flagged Beams: 0 0.00% Sidescan Data (1024 pixels): Number of Pixels: 5243904 Number of Good Pixels: 2870390 54.74% Number of Zero Pixels: 0 0.00% Number of Flagged Pixels: 2373514 45.26% Navigation Totals: Total Time: 0.6528 hours Total Track Length: 8.7888 km Average Speed: 13.4624 km/hr ( 7.2770 knots) Start of Data: Time: 08 15 1998 15:35:11.550000 JD227 Lon: -119.9326 Lat: 39.2139 Depth: 15.3400 meters Speed: 149809017.1972 km/hr (80977847.1336 knots) Heading: 161.7000 degrees Sonar Depth: -0.0300 m Sonar Altitude: 15.3300 m End of Data: Time: 08 15 1998 16:14:21.790000 JD227 Lon: -119.9471 Lat: 39.1399 Depth: 14.4000 meters Speed: 13.3996 km/hr ( 7.2430 knots) Heading: 219.0000 degrees Sonar Depth: -0.0200 m Sonar Altitude: 14.4200 m Limits: Minimum Longitude: -119.9490 Maximum Longitude: -119.9303 Minimum Latitude: 39.1397 Maximum Latitude: 39.2141 Minimum Sonar Depth: -0.0800 Maximum Sonar Depth: 0.0400 Minimum Altitude: 0.0000 Maximum Altitude: 119.2400 Minimum Depth: 3.3000 Maximum Depth: 262.0800 Minimum Amplitude: -61.0000 Maximum Amplitude: 0.5000 Minimum Sidescan: -64.0000 Maximum Sidescan: 63.5000 Data Record Type Notices: DN: 5122 MB_DATA_DATA (ID=1): survey data DN: 4645 MB_DATA_NAV (ID=12): Navigation record Nonfatal Error Notices: EN: 1 MB_ERROR_OUT_BOUNDS (ID=-2): Data outside specified location bounds EN: 4645 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: 15 DATA PROBLEM (ID=3): Instantaneous speed exceeds 25 km/hr Coverage Mask: CM dimensions: 10 10 CM: 0 0 0 0 0 0 0 0 1 1 CM: 0 0 0 0 0 0 0 1 1 1 CM: 0 0 0 0 0 1 1 1 1 0 CM: 0 0 0 0 0 0 1 1 1 1 CM: 0 0 0 0 1 1 1 1 1 1 CM: 0 0 0 1 1 1 1 1 1 1 CM: 0 0 0 1 1 1 1 1 0 0 CM: 0 0 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 0 0 0 0