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Topographic Normalization

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Is there any advice about how to prepare topographic Normalization for an image via GIS, to have a same result we have if we prepare it via ERDAS 9.1,

Note: i did it several time via Erdas but still have the same error: the pixels appear bigger as if u have a mosaic Art sheet ( the image pixel size 30*30 land sat) and i used a Dem file which converted from a TIN file via GIS the contour interval is 5m

thanks in advance :)

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