GDAL is a very useful and robust open source tool set for manipulating raster data sets. Unfortunately, there are only limited resources available to learn the GDAL command line utilities or the associated APIs for Linux and Windows users. Below are some useful websites for learning more about GDAL, open-source geoprocessing applications, and how to apply them.
GDAL.org
Source location for GDAL open source project. Foundational information on command line utilities, API, programming, and open source rasters. Critical resource.
http://www.gdal.org/
http://www.gdal.org/gdal_utilities.html
OSGEO Trac
Important open source organization for geospatial tools and tutorial.
http://www.osgeo.org/
https://trac.osgeo.org/gdal/wiki/UserDocs/RasterProcTutorial
FWtools
Aggegator of open source tools. Has binaries for Windows and Linux
http://fwtools.maptools.org/
Utah State University Course Notes
Course notes about geoprocessing with Python and GDAL. Well organized and widely referenced. Good place to start learning open source geoprocessing.
http://www.gis.usu.edu/~chrisg/python/
Max Konig’s Blog on Geoinformatics
A useful blog with many scripting examples on how to process large datasets with open source geomatics tools. One of the best places to learn basic GDAL procedures.
http://geoinformaticstutorial.blogspot.com/
Michigan View
Introduction to GDAL from state of Michigan geospatial and remote sensing resources
http://wiki.americaview.org/display/miview/Introduction+to+GDAL
DM Solutions Group
Tutorial on working with elevation data in GDAL
http://research.dmsolutions.ca/?p=350
Remotely Senseless
FWTools / GDAL tutorials for file conversion
http://dgsg.wordpress.com/
http://dgsg.wordpress.com/2008/03/12/using-gdal-to-import-a-lot-of-images-or-one-image-with-multiple-bands-at-one-time/
http://live.osgeo.org/en/quickstart/gdal_quickstart.html
UC DAVIS- California Soils Resource Lab
Information on open source processing of vector and raster data for Soil Scientists but universally useful
http://casoilresource.lawr.ucdavis.edu/drupal/node/95
http://casoilresource.lawr.ucdavis.edu/drupal/node/98
http://casoilresource.lawr.ucdavis.edu/drupal/node/105
UCSB – National Center for Ecological Analysis and Synthesis
GDAL reference info
http://help.nceas.ucsb.edu/GDAL
Africa Cybertaxonomy Portal – Royal Museaum of Central Africa
Pyramid and raster tutorial
http://cybertaxonomy.africamuseum.be/node/49