Page 209 - MATLAB Recipes for Earth Sciences

204 8 Image Processing

Fig. 8.3 Indexed color image using a colormap containing 16 different colors. The result
is displayed using imshow. Original image courtesy of NASA/GSFC/METI/ERSDAC/
JAROS and U.S./Japan ASTER Science Team.

8.4 Importing, Processing and Exporting Satellite Images

In the previous chapter we used a processed ASTER image that we have
downloaded from the ASTER web page. The original ASTER raw data con-
tain a lot more information and resolution than the free-of-charge image
stored in unconform.jpg. The ASTER instrument produces two types of data,
Level-1A and 1B. Whereas the L1A data are reconstructed, unprocessed in-
strument data, L1B data are radiometrically and geometrically corrected.
Each ASTER data set contains 15 data arrays representing the intensity val-
ues from 15 spectral bands (see the ASTER-web page for more detailed