Swath Data File: tahoe_98_409.0.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: 2548 Bathymetry Data (121 beams): Number of Beams: 308308 Number of Good Beams: 152248 49.38% Number of Zero Beams: 156060 50.62% Number of Flagged Beams: 0 0.00% Amplitude Data (121 beams): Number of Beams: 308308 Number of Good Beams: 152248 49.38% Number of Zero Beams: 156060 50.62% Number of Flagged Beams: 0 0.00% Sidescan Data (1024 pixels): Number of Pixels: 2609152 Number of Good Pixels: 1297955 49.75% Number of Zero Pixels: 0 0.00% Number of Flagged Pixels: 1311197 50.25% Navigation Totals: Total Time: 0.1766 hours Total Track Length: 2.2624 km Average Speed: 12.8140 km/hr ( 6.9265 knots) Start of Data: Time: 08 17 1998 22:02:34.010000 JD229 Lon: -120.1283 Lat: 39.1732 Depth: 8.3600 meters Speed: 0.0000 km/hr ( 0.0000 knots) Heading: 91.7000 degrees Sonar Depth: 0.0700 m Sonar Altitude: 8.2900 m End of Data: Time: 08 17 1998 22:13:09.600000 JD229 Lon: -120.1031 Lat: 39.1687 Depth: 13.4400 meters Speed: 0.0027 km/hr ( 0.0014 knots) Heading: 118.4000 degrees Sonar Depth: -0.1100 m Sonar Altitude: 13.5500 m Limits: Minimum Longitude: -120.1284 Maximum Longitude: -120.1028 Minimum Latitude: 39.1682 Maximum Latitude: 39.1735 Minimum Sonar Depth: -0.2800 Maximum Sonar Depth: 0.3100 Minimum Altitude: 0.0100 Maximum Altitude: 14.1800 Minimum Depth: 7.9600 Maximum Depth: 19.8000 Minimum Amplitude: -50.0000 Maximum Amplitude: -4.0000 Minimum Sidescan: -64.0000 Maximum Sidescan: 63.5000 Data Record Type Notices: DN: 2548 MB_DATA_DATA (ID=1): survey data DN: 1263 MB_DATA_NAV (ID=12): Navigation record Nonfatal Error Notices: EN: 1263 MB_ERROR_OTHER (ID=-8): Neither a data record nor a comment record Problem Notices: PN: 9 DATA PROBLEM (ID=3): Instantaneous 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 0 0 0 0 0 0 0 CM: 0 1 1 1 0 0 0 0 0 0 CM: 0 0 1 1 1 1 0 0 0 0 CM: 0 0 0 1 1 1 1 1 0 0 CM: 0 0 0 0 1 1 1 1 1 0 CM: 0 0 0 0 0 1 1 1 1 1 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 0 1