Hi I'm trying to create a base layer for a topo map using a DEM and landsat data.
To make sure everything isn't simply a smear of colors I use ratioing of the landsat bands so that I can draw with a couple of different colors. I currently use 4-3/4+3 (ndvi) and 5-6/5+6. Now I would like to pan-sharpen to improve the resolution of the finished product, and I'm wondering what the best way to do this is. First: Do I pan-sharpen the original band data before ratioing, or do I sharpen the ratio output somehow? Second: What's the best way to pan-sharpen this? Most examples I could find talked a lot about getting a natural-looking rgb image, which isn't what I want. I tried i.fusion.brovey, and sharpened bands 3, 4 and 5 and then tried ratioing based on that but the output was very different (in a worse way) than the normal NDVI. Then I tried a receipe from "Open Source GIS" which translated the image to HIS and back again with band 80 as intensity, this seems to have helped the resolution of the 5/6 ratio, but not the 4/3. I did the sharpening using red=band30 green=band40 blue=band50. Oh, and is it possible to pan-sharpen band 6 data too? PS: I'd appreciate copies of replies directly to me in addition to to the list since I often don't have the time to read the list. -- Knut Arne Bjørndal aka Bob Kåre [email protected] bobk...@irc
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