What are consequences of the wrong ephemeris data on a product?
If the ephemeris data is wrong, then the systematic corrections are not correctly applied, and as a consequence, geometrical errors can arise. During processing, any wrong and missing values are corrected; however an ephemeris group shift could remain. Usually, the shift, inherent to estimated spacecraft positions, is more important in along track (AL) direction than in across track (AC) direction. For instance, a wrong onboard counter induces a shift in time which means the Landsat scene is shifted in the AL direction.. Q38. I am presently conducting a project using a pixel-by-pixel change detection method. Could I superpose two systematic corrected products? What are the specifications concerning the temporal registration? Bands of similar resolution coming from systematic corrected products of a same location and with same output map projection parameters can be superimposed. The satellite is held from +/-5 km from its repeat of the ground track, and therefore satellite altitude may
