Creating coloured rasters with GDAL

Posted by & filed under gdal, QGIS.

One of the most popular posts on my blog ever is my article about creating GDAL hillshades: ‘A workflow for creating beautiful relief shaded DEMS using GDAL‘. In the techniques outlined in the aforementioned article, colours are assigned across a continuum to and superimposed on top of a hillshaded model. The GDAL tools in QGIS… Read more »

Selecting GDAL Drivers on the fly with QGIS

Posted by & filed under gdal, QGIS.

There is quite an old ticket in the QGIS bug tracker relating to the need to be able to select which GDAL drivers to use. The issues is this: GDAL in some cases provides multiple drivers for the same image type. For example, JPEG2000 datasets can be opened using ECW’s proprietary driver, KAKADU (gotta love… Read more »

Improvements to raster performance in QGIS master

Posted by & filed under gdal, QGIS.

Today I committed changes to QGIS master that I started working on at the Lisbon hackfest and finalised this week (along with a unit test yay!). The changes implement improvements to the way in which statistics are gathered for rasters. First a little history: the raster stats code in QGIS is some of the earliest work… Read more »

Frank Warmerdam to become a Google guy

Posted by & filed under gdal.

If you follow the osgeo planet blog aggregator, you may have noticed Frank Warmerdam’s recent blog post mentioning that he is off to work for Google. If I think back to the blog posts I have written, GDAL features in a great many of them – its a mainstay tool for me and barely a… Read more »

Batch clipping with GDAL and bash

Posted by & filed under gdal, General FOSSGIS.

I know the little bash scripts I write and post here are popular so here is another one.  The script sequentially unzips worldclim future climate scenario datasets, and then clips them to the bounding box of Tanzania using gdal. After clipping, it removes the extracted files again so you are left with just your original downloaded… Read more »