Digital Geography

Landsat in Love with QGIS: the newest coup from Luca

landsat previewThe normal way of getting Landsat data for your GIS projects often was: visit a Landsat data mart like landcover.org, earthexplorer or WIST, search for your area and time and download/order your desired data. Once you’ve done this, you were prepared to add, analyse and publish this data/results with QGIS. Luca Congedo from the blog “From GIS to Remote Sensing” .

How to create a wind map in QGIS

vector fieldA few days ago I saw Franz Leonardo’s post on the ArcGIS group on facebook: He visualised wind speed and direction in ArcGIS for a wind map and I thought by myself: let’s do it with QGIS… Here is the tutorial which covers some aspects of interpolation, symbol levels, classification and formulas…

Short Announcement: QGIS 2.8 Wien released

2015-02-22 19_08_16-Program ManagerQGIS 2.8 (the new “Long Term Release”) was released a few days ago. It is a minor release according to the changelog but it will be supported in this setup at least for the next year: Some good news for all those working in a bigger, administrated environment as it is always a problem to update software in these bigger infrastructures. New features: >1000 issues flagged by static analysis tools fixed new code commits and pull requests are now automatically tests against our testing framework. more responsive browser support for contextual WMS legend graphics custom prefixes for joins creation of…

Creating ARCs in QGIS: The Python Way

curves in QGISSo I came across this nice little project which focussed on trip planning and route over large distances… And there was this nice little post from Nathan Yau at flowingdata.com where he describes the making of great circles from one point to different other points in R and the other example from Anita Graser where she shows how to deal with an Arc in QGIS but using postgis functionality. So what about QGIS itself and a programmatic way? See yourself…

Create A Raster Layer Index With QGIS And GDAL

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When working with raster datasets, it is hard to keep an overview of the raster files in use and their coverage. Most raster data providers may keep metadata in the filename itself, like path, row and a timestamp. But for more convenience, it is possible to create an index of your raster maps. This article will show you, how to accomplish this in QGIS or with the Terminal.

Python in QGIS and ArcGIS: A Small Example

usage info python consoleOften the usage of GIS never touches the world of programming and I think a lot of GIS users today feel fine with using simple tools and try to avoid tools like Python for their daily work. Despite any prejudices regarding programming, Python can be a big help in your basic tasks and is a very easy scripting language to learn. So let us check out Python in ArcGIS and QGIS with a buffer analysis as an easy example. Nevertheless I recommend to take some coding lessons in Python using CodeAcademy.

Posts 2014: our Top Ten List

D3 line simplification toolYesterday I received the mail from Anita Graser’s blog about the best 10 articles on QGIS planet. Therefore I decided to have a look on our own top ten list of most read articles this year. And I have to admit: It’s not the open source world who leads this list…

QGIS 2.8: A Preview

screenshot-from-2014-12-16-174447QGIS 2.6 landed recently on this planet and it already brought great improvements to our daily work with geodata, the way we publish our results and the convenience in our workflows. But due to the very ambitious release plan of the QGIS core team and the great work of Klas we can have a look at the upcoming features in QGIS 2.8 major version already. Check em out:

Quick QGIS Tips on YouTube

Screenshot from 2014-12-14 18:33:04

I’ve been experimenting with very short QGIS tips on YouTube, and if you like them I’ll continue to create them. They may or may not reveal something extraordinary, and if you have an idea of something worth creating a short video on, leave a comment or send me an e-mail, tweet, or whatever.

Create custom markers with R for your webmap

piechart markerWhen it comes to webmapping there are thousands of possible markers you can choose from but when it comes to markers depending on the data, which is inside the shapefile, possibilities are more limited. In leaflet you can define different icons according to the attributes of your data by defining the icon url in an attribute. Let me show you, how to use the data in each feature to create a custom icon like a piechart marker using R.

Amazing styling in QGIS 2.6

Screenshot from 2014-11-23 14:49:53

Since QGIS 2.6 was released with a lot of new features and functions I’ve been testing it sporadic and have come to realise that the quality and functionality of symbol styling and labelling is so high that ESRI ArcMap no longer can match it. Honestly I haven’t tested the 10.3 version of ArcMap, so my experience is based on previous versions. Here I’ll use an example to highlight some of the extensive possibilities offered in QGIS.

QGIS 2.6: insights

QGIS 2.6 sttart screen

Yesterday QGIS 2.6 Brighton was released. Now all systems are supported as also KyngChaos compiled a new version for QGIS 2.6 (source). In this post, I thought myself to go through the advertised features and changes introduced, so it may be a bit far. So let’s follow the QGIS changelog. Export DXF enhancements DXF is not something I normally use, but in many CAD and measuring instruments (total stations type), it is a common format. Exports can be created via the menu (Project> DXF Export …). Since I am not used to work with DXF it is difficult to have…