Some geek eyecandy

Posted by & filed under General FOSSGIS.

We and our clients regularly work with very large spatial datasets. One of the servers I set up for a client gives this when I run du: Filesystem            Size  Used Avail Use% Mounted on /dev/sdd1              14T   11T  2.1T  84% /mnt/storage /dev/sdc1              14T  143M   13T   1% /mnt/storage2 With apologies to non-geeks who don’t see the point… 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 »

Raster Masks in QGIS/FOSSGIS

Posted by & filed under General FOSSGIS, QGIS.

A common activity in GIS is to mask off parts of an image such that it has transparent pixels in the masked area. We can do this in QGIS too with a bit of help from gdal. Lets look at this niche model I ran for Anopheles gambiae: What I really want is all the… Read more »

Addition to the Linfiniti team

Posted by & filed under General FOSSGIS, Uncategorized.

Just an update to let you know that I have recently joined Linfiniti. I was lucky enough to be an intern earlier in the year, and am happy to be part of the team again, and helping in bringing Open Source GIS to Africa and other parts of the world A quick introduction – my… Read more »

A week in Tanzania

Posted by & filed under General FOSSGIS, Postgres & PostGIS, QGIS.

I spent most of last week in Dar es Salaam, Tanzania. A lovely tropical country in the heart of Africa. I was there as part of a project I am working to create tools for Biodiversity Informatics practitioners. Of course the tools are based on Free Software: Quantum GIS and openModeller. The attendees at the… Read more »

Overpainting with Mapnik

Posted by & filed under General FOSSGIS, Postgres & PostGIS.

The problem I’ve been having a little poke around with Mapnik today (awesome software!). One of the things on my todo list has been to sort out rendering issues with roads we have been having. Our last iteration described roads something like this: A style… <Style name=”Freeway30th_style”> <Rule> <LineSymbolizer> <CssParameter name=”stroke”>rgb(169,170,153)</CssParameter> <CssParameter name=”stroke-width”>12.26</CssParameter> <CssParameter name=”stroke-linejoin”>bevel</CssParameter>… Read more »