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Archive for 'GIS'

Merge Subdirectories of Shapefiles Using OGR

As a follow-up to my post “Merge A Directory of Shapefiles Using OGR,” I came across a similar problem today.  I had a bunch of data in subfolders inside a parent folder.  I wanted to merge all of these shapefiles into one, without manually moving them into a single directory (and since they all had [...]

Merge A Directory of Shapefiles Using OGR

Here’s something that may seem obvious to power users of GDAL/OGR, but not to those that are just new to using these great free tools.  This is something that I use on an almost daily basis, and works when a lot of other options (QGIS, Kosmo, etc.) seem to fail.  Essentially, this sequence of commands [...]

“It’s Turtles All The Way Down”

All I can say is that Paul Ramsey is a genius.  This is the best presentation I’ve seen in a long time, so despite it being posted elsewhere, I’m posting it here again anyway:  Why Your Data Sucks Please upgrade your browser

OSM/Potlatch Easter Egg for Easter Weekend

Happy Easter for all of you out there celebrating!  For those that aren’t; enjoy the time off work if you get it.  I know I will! Matt and I spent some time the other night playing with Open Street Map, updating roads in the Perth area, and just generally investigating how it works.  Using Potlatch [...]

Never Underestimate the Humble Spatial Index

This is more a reminder to myself than anything else,  but will be a good reminder for everyone out there in OSGEO land. When performing any geoprocessing task in QGIS, don’t forget to build a spatial index first. It really does help!  Save the hours of frustration and waiting by clicking that one little button!  [...]