Hola Alex, The .adf file you have downloaded is actually a raster grid file; this can be directly brought into ArcMap. If you would like to take this file further, you are able to simply right click on it and export it to any format needed. I am including some documentation on this file type, this should assist you further. Gracias, Alex! Raster To Other Format (Conversion) http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//001200000032000000 Esri Grid format http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//009t0000000w000000 Supported raster dataset file formats http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//009t0000000q000000 Hi Juan, can you explain me the step by step procedure how to open adf file in arcmap. thanks
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