Four years of Landsat-7 on-orbit geometric calibration and performance |
| |
Authors: | Lee D.S. Storey J.C. Choate M.J. Hayes R.W. |
| |
Affiliation: | Earth Resources Obs. Syst. Data Center, Sci. Applic. Int. Corp., Sioux Falls, SD, USA; |
| |
Abstract: | Unlike its predecessors, Landsat-7 has undergone regular geometric and radiometric performance monitoring and calibration since launch in April 1999. This ongoing activity, which includes issuing quarterly updates to calibration parameters, has generated a wealth of geometric performance data over the four-year on-orbit period of operations. A suite of geometric characterization (measurement and evaluation procedures) and calibration (procedures to derive improved estimates of instrument parameters) methods are employed by the Landsat-7 Image Assessment System to maintain the geometric calibration and to track specific aspects of geometric performance. These include geodetic accuracy, band-to-band registration accuracy, and image-to-image registration accuracy. These characterization and calibration activities maintain image product geometric accuracy at a high level-by monitoring performance to determine when calibration is necessary, generating new calibration parameters, and verifying that new parameters achieve desired improvements in accuracy. Landsat-7 continues to meet and exceed all geometric accuracy requirements, although aging components have begun to affect performance. |
| |
Keywords: | |
|
|