User Manual - pancroma

It is also possible to combine the ENHG and the other algorithms. ENHG usesthe NIR band to modify the green band, increasing the pixel values of vegetatedareas and creating a new ENHG band file. This file can be used in place of thegreen band. The ENHG file can be prepared manually or combined with the HSImethod using the automatic utility. If prepared manually, it can be combined withthe XIONG or AJISANE algorithms as well.The final image shows the result of preprocessing the green band using theENHG algorithm (using a factor of 0.07), then substituting the ENHG band for thegreen band in the AJISANE method. I also adjusted the water body tones usingthe ‘Change Dark Pixels’ utility on the Image Processing Data Input form using acutoff of 42 and adding 20 to the blue channel. All three channels brightened by20 and some contrast and sharpening applied. The green tones are a bit betterand this image and the water looks OK. While not an exact match for the RGBimage, is acceptably close.This exercise has demonstrated how the spectra fidelity of pan sharpenedLandsat images can be further improved by combining the PANCROMA TM ENHGand other pan sharpening methods, including the AJISANE, helping to achievecolor tones in the pan sharpened image that approach those of the standardRGB composite. The final image is the entire scene, first the RGB compositeand then the pan sharpened image using the ENHG and AJISANE methods incombination.386