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Hi there, thanks again for all your help on this. I now figured out why ArcGIS didn`t like to create my watersheds... I had missed to install Service Pack 2! That was the whole problem! Now I`m happy to have my watersheds ready for further processing. Best, Carina
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08-30-2011
01:33 PM
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Just looked it through - it`s all fine. The same projection and datum.
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08-29-2011
01:51 PM
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Hmm... I have adapted the extent to the one of the DEM every time I used a tool (under the environment settings). The green pixel represents the pour point I calculated by using the snap pour point tool. It belongs to the red point below at the right hand side and should normally be placed on it.
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08-29-2011
01:09 PM
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yes they are all in one projection (MAGNA_Colombia_Bogota) and cell size is 30 x 30 m
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08-29-2011
12:54 PM
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Hi all, first of all thanks a lot for your help! Unfortunately I couldn`t solve my problem yet. I have been trying several ways: 1) I made sure that my pour points have been set (manually) on the flowacc layer and all extents and projections are well chosen, then I entered the pour points and the flowdirection files into the watershed tool. --> Result: tiny watersheds 2) I created a few pour points manually and then applied the snap pour points tool on them. --> Result: the snapped pour points appear displaced (each around 8x2 pixels into the same direction) from the old points I set manually. (I am attaching a screenshot). 3) The same thing happens when I convert points to raster. The newly created raster cell always remains displaced from the original point. I am working with the Magna_Colombia_Bogota projection only and have made sure that it has been set correctly in the Environment options. Do you see any possible error? Cheers, Carina
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08-29-2011
12:30 PM
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Hi, I am having the same problem right now. Some of my watersheds appear as single pixels only. The extension solution does not work. Anyone has another idea? Thanks!
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08-26-2011
09:15 AM
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