Tag Archives: GDAL

Working In GDAL (WIG) – Calculating Slope

Posted on June 25th, 2012

In this new monthly series, I turn my attention to one of the most powerful software packages for raster processing available – the Geospatial Data Abstraction Library (GDAL) – and as an added bonus, it’s free! Each month, I will focus on a different utility offered in GDAL, walking the reader through its applications and offering up a series of tips and illustrations so that you can emulate this process in your office and/or home. In this first edition of WIG, I show our readers how to use GDAL to calculate slope from a raster digital elevation model (DEM). About GDAL GDAL is an open source software application that was launched in 1998 and has been updated multiple times since. While the current version of GDAL (i.e. version 1.9) can be downloaded from multiple locations, I find this site to be the most up-to-date and easy to navigate. I suggest downloading the stable version of the MSVC2010 build for either 32-bit or 64-bit PCs depending on which you have access to. GDAL contains a wide array of utilities to help you process raster files. I find that GDAL is more stable and runs quicker than ArcGIS, ENVI and PCI for … testContinue reading

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