What is the cell size of your output rasters? This is likely the cause of the large file sizes. For example, one meter resolution for the state of Minnesota generated files closer to TB in size rather than GB.
I'd look into Jarlath's suggestion unless you need a capability outside the suggested tools.
Chris Martin
Application Developer
Esri - Professional Services
Washington, DC
------------------------------------------------------------------------- This list (NEARC-L) is an unmoderated discussion list for all NEARC Users. If you no longer wish to receive e-mail from this list, you can remove yourself by going to http://listserv.uconn.edu/nearc-l.html.Hi,I am creating a global hillshade file from the GLSDEM. I've mosaiced the tiles into four hemisphere-wide rasters (16-bit signed integer). I am running each mosaic through the ESRI 10.2 Hillshade tool which outputs 8-bit unsigned files. There are 2 issues:1) The output files are still huge (20GB or something ridiculous). I have tried tif, jp2 and img but none of them help with file size.2) I'd like to remove or make transparent the non-shaded areas. ESRI directions say to use a reclassify or extract by attribute to separate non-zero values. Thing is, most of the resulting hillshade pixel values are non-zero so not much area would be made transparent by creating such a file.Any ideas?It seems that much of the support documentation assumes you want to use mosaic datasets which I cannot in this case.Many thanks,Christi