Digital Geography

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…

How to use OpenStreetMap, guides for beginners and advanced users on LearnOSM.org

2014-10-28 19_14_51-LearnOSM

OpenStreetmap is the fastest growing community mapping project of all times. Beside the “normal” map result, what you can use for your daily navigation through cities and countries like Google Maps, OpenStreetMap allows you to get the geodata and use it for your own ideas and projects (with some licence regulations). For many peoples the difficult part is not getting the data but the usage and adoption. Therefore the Humanitarian OpenStreetMap Team created LearnOSM.org.

DEM comparison: SRTM 3 vs. ASTER GDEM v2

ASTER vs SRTMLet’s get ready to rumble! No, just kidding. We are all excited about the recent message from the white house: SRTM “1” (1 equals 1 arcsecond, whereas 3 was indicating the 3 arcsecond a.k.a. 90m DEM) or the official title SRTM-2 will be available for free in the next months (orig. here, dg here). So why is it so important? Most DEM-interested people will answer: “Use the ASTER DEM if you need 30m!”. But let us have a closer look on both systems and how they perform.

QGIS 2.6 Feature Freeze

Screenshot from 2014-09-20 12:13:31

Are you curious about QGIS 2.6? Well on Friday (9-26) QGIS development goes into feature freeze and focus will shift towards fixing bugs and enhancing stability. What can we expect from the upcoming release. Read on to find some interesting news.

QGIS 2.6 – Sneak Peak

Picker

The release of QGIS 2.6 is planned for October 24, but you don’t have to wait to test new functions in development. In this post I’ll look closer on two new features that in my mind will make GIS life easier, even if some improvements should be made with the first of the new features described here.

Exploring OSM Israel/Palestine

Screenshot from 2014-07-27 10:25:23

In this post I’ll show how to explore (or data mine) Open Street Map data and use features off-line that normally can be hard to get. Many use http://download.geofabrik.de to download zipped shapefiles to be used directly in GIS systems, but are surprised when it does not contain as much data as the same area in Open Street Map on-line. You can still use geofabrik.de but download the *.osm.bz2 files instead. They include raw data from OSM that needs to be processed in order to be used in QGIS or other GIS applications. In QGIS there’s a tool in the…

Military Expenditure on a map

Screenshot from 2014-07-17 14:34:15

Statistical data for a geographer is fun! War is not! Regardless what you think of the military it never hurts to be informed, so… Lets play a bit with military expenditure statistics. I’m using data from SIPRI (Stockholm International Peace Research Institute), which covers military expenditure for regions and countries based on for instance GDP. The data is in Excel format (.xlsx) which is a problem for QGIS, so it has to be converted to a format that QGIS understands. First however some other issues must be addressed. In order to use the years as field names they must be…

regular spaced points… interpolation madness…

rasterized point shapefile in QGISThe geodata department of the city of Berlin offers a great portfolio of free geodata for everyone to use. One dataset is the result of some LIDAR measurements and is offered as a txt with x,y and d values. This is commonly known as xyz data but should not be mistaken as a simple whatever-delimited text file. This dataset is regular spaced and therefore can be threatened easily with QGIS. But let me first show you some interpolation results which can be produced as well. Interpolational madness If you want to create raster data from a point shapefile or a…

reproject and filetype change in python/pyqgis for QGIS plugin

featured_2In my current work on the qgis2leaf plugin I had the idea to place raster data on a leaflet map as an image overlay. With this in mind and looking at a webmap I needed to consider a good filesize, a strict projection of EPSG:4326 and a strict filetype as well. So decision was: projecting everythin to EPSG:4326 and changing file type to *.jpg. I know, how to do this in the Terminal and in QGIS. But what options do you have using python/ pyqgis only? Terminal For doing this work in the terminal/shell/command line the one and only choice…