On Mar 25, 2015, at 3:14 PM, Christi Ludlow Townsend <[log in to unmask]> wrote:

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

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