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Modeling big watersheds

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Hi

I m modeling a big watershed (around 4000km from east to west), which occupies five UTM zones, and the program requires the DEM to be in planimetric coordinate in order to run TOPAZ, but the convertion only accept ONE UTM zone. I dont know what to do, or how to properly convert the coordinates of my watershed. By the way, i m running the model in china.

thanks

ana

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Hi Ana,

This may turn out to be a difficult problem, but I think you should be able to convert all your data to your western-most UTM zone. This should make all your DEM values positive so TOPAZ will run. TOPAZ may have troubles running if your coordinates are very large, but I think we have fixed this limitation in TOPAZ. I don't think TOPAZ will run if you send it a DEM with negative X/Y coordinates, so the western-most UTM zone will probably be your best bet.

I hope this helps with your problem. Let us know how things turn out.

Chris

Hi

I m modeling a big watershed (around 4000km from east to west), which occupies five UTM zones, and the program requires the DEM to be in planimetric coordinate in order to run TOPAZ, but the convertion only accept ONE UTM zone. I dont know what to do, or how to properly convert the coordinates of my watershed. By the way, i m running the model in china.

thanks

ana

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