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In January of 2007, California Department of Water Resources tasked a team consisting of the URS Corporation and Fugro EarthData to obtain and process high resolution topographic data using lidar. The project area encompassed the Sacramento-San Joaquin Delta, Suisan Marsh, and the Los Vaqueros reservoir in California. Total project area in square miles was 1646 with a 100-ft buffer along the project boundary. The aerial lidar survey for this purpose was collected at a nominal 1-meter post spacing. Airborne 1 flew the lidar and processed the boresight calibration, Towill Inc. surveyed the ground control, and Fugro EarthData Inc. did all the lidar processing. The major acquistion window occurred in Jan/Feb of 2007 with reflights completing during Feb/March of 2008. The processed lidar was delivered in ascii, las, and ESRI geodatabase formats along with 1ft contours and a 1m DEM bare earth grid.
All data are registered to UTM Zone 10, NAD83 horizontal datum and NAVD88 vertical datum. The elevations are in feet and the cell size is 1m by 1m.
The accuracy specifications are as follows: Vertical accuracy: 95% at 0.6 ft and 90% at 0.5 ft. Horizontal accuracy: 1.0 ft, 1 sigma.
In January of 2007, California Department of Water Resources tasked a team consisting of the URS Corporation and Fugro EarthData to obtain and process high resolution topographic data using lidar. The project area encompassed the Sacramento-San Joaquin Delta, Suisan Marsh, and the Los Vaqueros reservoir in California. Total project area in square miles was 1646 with a 100-ft buffer along the project boundary. The aerial lidar survey for this purpose was collected at a nominal 1-meter post spacing. Airborne 1 flew the lidar and processed the boresight calibration, Towill Inc. surveyed the ground control, and Fugro EarthData Inc. did all the lidar processing. The major acquistion window occurred in Jan/Feb of 2007 with reflights completing during Feb/March of 2008. The processed lidar was delivered in ascii, las, and ESRI geodatabase formats along with 1ft contours and a 1m DEM bare earth grid.
All data are registered to UTM Zone 10, NAD83 horizontal datum and NAVD88 vertical datum. The elevations are in feet and the cell size is 1m by 1m.
The accuracy specifications are as follows: Vertical accuracy: 95% at 0.6 ft and 90% at 0.5 ft. Horizontal accuracy: 1.0 ft, 1 sigma.