4. RESULTS
The cross-talk problem (Iwasaki et al., 2001) was solved using a "cross talk correction" program developed by ERSDAC (2001). Afterwards resampling of SWIR bands from 30 to 15 m was done, in order to integrate with VNIR.
For the registration of the ASTER images, 20 control points were identified, using a first grade polynomial and resampling of pixels by the nearest neighbor algorithm. During the evaluation of the exactness of registration using as reference the image from 2003, a RMS error of 0,27 was obtained. This result is considered as reasonable, because for a spatial resolution of 15 m of ASTER images, the internal error of points used for mapping (4 m) is less than half a pixels' spatial resolution of the images. As for the 2002 image, the RMS error of 0.05 was considered excellent.