THE MONOSCOPIC AND STEREOSCOPIC GEOLOCATION ACCURACY OF THE DIGITALGLOBE SATELLITE CONSTELLATION

摘要

The geolocation accuracy of DigitalGlobe's satellite constellation has been monitored over the last 2 years. Using quarterly statistics compiled from the analysis of monoscopic images, the horizontal geolocation accuracy of each satellite was shown to be stable over time. QuickBird-2 always had a quarterly 90th percentile between 13 and 18 meters projected to nadir over the last two years. WorldView-1 accuracy varied between 3.6 to 4.9 meters at nadir over the same 2 year period. Throughout 2010, WorldView-2 monoscopic accuracy fluctuated between 2.4 and 3.5 meters at nadir. In addition, WorldView-2 stereo pairs have been examined using similar methods. Quarterly statistics reveal stable accuracies in both the horizontal and vertical components of stereoscopic geolocation error. During 2010, the CE90 of horizontal error ranged between 2.6 and 4.6 meters, while the LE90 of vertical error was between 3.1 to 4.5 meters.