Wrong navigation instructions can be annoying and sometimes even dangerous, but they happen. No dataset is free of errors. That’s why it’s important to assess the quality of datasets. One spe...
https://anitagraser.com/2016/07/23/osm-turn-restriction-qa-with-qgis/
CKAN is for data portals what QGIS is for GIS. The project describes itself as CKAN is a powerful data management system that makes data accessible – by providing tools to streamline publishing...
https://anitagraser.com/2016/06/26/exploring-ckan-data-portals-with-qgis/
The upcoming 2.14 release of QGIS features a new renderer. For the first time in QGIS history, it will be possible to render 2.5D objects directly in the map window. This feature is the result of...
https://anitagraser.com/2016/02/14/experiments-in-the-3rd-dimension/
Monday, January 4th 2016, was the open data release date of the official Austrian street network dataset called GIP.at. As far as I know, the dataset is not totally complete yet but it should be ...
https://anitagraser.com/2016/01/06/a-qgis-router-for-gip-at/
IDF is the data format used by Austrian authorities to publish the official open government street graph. It’s basically a text file describing network nodes, links, and permissions for differe...
https://anitagraser.com/2015/07/23/open-source-idf-parser-for-qgis/
A few weeks ago, the city of Vienna released a great dataset: the so-called “Flächen-Mehrzweckkarte” (FMZK) is a polygon vector layer with an amazing level of detail which contains roads, bu...
https://anitagraser.com/2015/04/17/routing-in-polygon-layers-yes-we-can/
At FOSS4G2013, I had the pleasure to attend a presentation about the ODVIS.AT project by Marius Schebella from the FH Salzburg. The goal of the project – which ended in Summer 2014 – was “t...
https://anitagraser.com/2014/12/21/exploring-open-government-population-data-collected-by-odvis-at/
Correct turn restriction information is essential for the vehicle routing quality of any street network dataset – open or commercial. One of the challenges of this kind of information is that t...
https://anitagraser.com/2014/12/13/qa-for-turn-restrictions-in-osm/
A while ago I wrote about the 5 meter elevation model of the city of Vienna. In the meantime the 5 meter model has been replaced by a 10 meter version. For future reference, I’ve therefore publ...
https://anitagraser.com/2014/08/03/5-meter-elevation-model-of-vienna-published/
Over the last years, research on OpenStreetMap data quality has become increasingly popular. At this year’s FOSS4G, I had the honor to present some work we did at the AIT to assess OSM quality ...
https://anitagraser.com/2013/12/15/osm-quality-assessment-with-qgis-positional-accuracy/