Geometric Accuracy Assessment of Digital Map Derived from QuickBird High Resolution Satellite Imagery

Abstract

The evaluation of the geometric accuracy obtainable from orthorectified QuickBird HighResolution Satellite Image (HRSI) product with an approximate Ground Sampling Distance (GSD) of 70cm, has been carried out using 49 Independent Check Points (ICPs). The ICPs which wereselected on the QuickBird HRSI were  represented as distinct point features conducive for highprecision measurement in both the HRSI and on the ground, well spread over the study area. These ICPs were surveyed using South Differential Global Positioning System (DGPS) based on thesame coordinate reference and projection as that of the QuickBird HRSI, to obtain their corresponding coordinates of Ground Control Points (GCPs). The results obtained indicated that the differences were of small magnitude and random in nature. The computed Root Mean Square Error (RMSE2D of 0.722481 m) and adjusted R2(0.999999) indicates that the accuracy obtained,conformed to the resolution of the orthorectified QuickBird HRSI. Hence, the orthorectified QuikBird HRSI could be applied for map creation, change detection, image analysis, and to geolocate features in remote areas without the use of ground control points as well as otherrelevant mapping applications.