User Manual - pancroma

the special image processing utilities in order to produce acceptable synthetictrue color images from SPOT data.Creating SPOT Pan Sharpened ImagesSPOT sensors also produce a 10m-resolution panchromatic band file. This canbe combined with the four 20m band files in order to produce pan sharpenedpseudo color images. The process for doing this is exactly the same as thatdescribed previously for Landsat images, except of course that you must openthe appropriate SPOT bands instead of Landsat bands. You can use any threeof the four 20m bands plus the 10m panchromatic band. The data set for myexample file would look like this:S4_11930_5531_20060629_m20_1_utm10.tifS4_11930_5531_20060629_m20_2_utm10.tifS4_11930_5531_20060629_m20_3_utm10.tifS4_11930_5531_20060629_p10_1_utm10.tifthe latter band being the panchromatic. The main difference in pan sharpeningSPOT data is that the files are smaller so that they process faster. The GeoBaseSPOT data is of exceptionally high quality and produces very impressive pansharpened images.Decomposing Earth Explorer SPOT RGB ImagesIt is possible to download 20m RGB SPOT composited images from the EarthExplorer website. These images cover all of the United States. Unfortunately,the panchromatic data is not available from this source, nor is the band 4 data.However the band 1, 2 and 3 files can be easily extracted from the color RGBfile. PANCROMA TM provides a utility for doing this. Once extracted and savedto disk, the bands can be recombined to produce true color composites using theutility described above, or recombined in other ways or with data obtained fromother sources.To decompose an RGB file, open the file and select ‘Display Files’ | ’Display OneColor Composite Image’ from the menu. Doing so will automatically generateboth the false color image (as downloaded from Earth Explorer) and the threegrayscale band files. Save the data in either .jpg or .bmp format.IMPORTANT NOTE: The color image and the grayscale band files must besaved in separate operations. To save the color image, select ‘File’ | ‘Save RGBImage’ and then choose either .jpg, .bmp or .png format. To save the band files,select ‘Save Grayscale Image’ and select either .jpg or .bmp format. All threeband files will be saved in a single operation. Suffixes ‘1’, ‘2’. And ‘3’ will beappended to the file name that you assign.94