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I have a spreadsheet that lists the file extensions for 400+ geotiffs that I need to add to ArcMap 10. Is there a way to automate the "Add Data" function? Thanks!

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Rather than write something to add 400 raster layers into your map (and Table of Contents) you might be better to Create a Raster Catalog from them so that just one layer results.

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Tip search in ArcCatalog (can be mapped drives and search geotiffs only) and drag & drop into an Open ArcMap Document and save.

Though your might find it more efficient to have all those geotiffs loaded into one file geodatabase.

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