Smathermather's Weblog

Remote Sensing, GIS, Ecology, and Oddball Techniques

Hillshade using PerryGeo’s ported GRASS utility

Posted by smathermather on December 22, 2009

Using the same LiDAR DEM from which we generated the contours, we can create hillshade tifs using  http://www.perrygeo.net/wordpress/?p=7.  It compiles easily on a mac, probably even easier on a Linux machine following his directions.  Then another simple loop:

#!/bin/bash
x=0
for f in $( ls *.txt); do
 x=`expr $x + 1`
 echo $x $f
 hillshade $f $f.tif
done

I’d like this all in a single tif:

gdal_merge.py *.tif

or in my case with such a large area:

gdal_merge.py -co "BIGTIFF=YES" *.tif

Then overviews:

gdaladdo -r average out.tif 2 4 8 16 32 64 128 256 512 1024

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