This video shows the procedure for installing our special version of QGIS which includes the various tools we created for
Posts Categorized: General FOSSGIS
Some geek eyecandy
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 »
A workflow for creating beautiful relief shaded dems using GDAL
Sometimes I create hillshades using the QGIS hillshade plugin and then overlay the original DEM over it. I set the DEM to have a false colour pallette and set it to be semi-transparent to produce something like this: That is all well and good but a bit impractical. It would be much nice to have… Read more »
QGIS & PostGIS Training at AIMS
This week we (Gavin Fleming, Sam Lee Pan and myself) are doing more training – a week of QGIS and PostGIS. Its a small group this time and they have GIS knowledge already so we get to go much deeper into the nuts & bolts of QGIS than I normally would do on a course… Read more »
Batch clipping with GDAL and bash
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
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
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
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
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 »
Django’s ForeignKey and inheritance limitations – solved
Last week I had to cope with one of the (few!) limitations of Django ORM model about inheritance. For the GeoDjango website we are developing, we created a model that stores user-layer pairs, so that a logged user can restore the state of map and legend as [s]he left it at previous login, and anonymous… Read more »