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most efficient way to combine six 1 band rasters and then extract by global coastal watersheds shapefile while retaining watershed IDs

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12-19-2022 12:38 PM
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hydrochristina
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Hi, 

I am using the rasters from this website (http://glass.umd.edu/KGClim) to classify global coastal watershed change for several variables (like annual total precip, and annual mean temp) for historical and future (2050s) periods. 

What is the best process for streamlining this analysis? Is there a way to combine all the raster files first (without overwriting the original data) so I could use a spatial join with my watershed polygon shapefile to extract data by watershed? I eventually need to be able to see how each watershed's variables changed across the two time periods.

Thanks.

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