HI M_Dakota and everyone else! I have a similar challenge with my data: I got many data file for Solar radiation (hourly data for 10 years, in kWh per m²) in asc format. Furthermore I have polygon layer, which represents the available roof areas, for which I would like to calculate the solar potential. My tasks are right now: 1) i need define a spatial reference for all data, which is easy possible with a batch. 2) I need to "combine"/calculate the raster information (radiation) for each polygon (roof area) for ALL ~ 20.000 datafiles. Does anybody has experience with this kind of task and might explain me how to proceed? Is it really necessary to use ArcMap for this or is there any better possiblity? Thanky for every kind of help!! Didi
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