Digital Geography

Using OpenStreetMap on your GARMIN

Since most people working with digital-data they are always interested in obtaining their own data using a Global Positioning System (GPS). Therefore I’ll give a short introduction for all of you, using a GARMIN device and like to have a free background map on the screens. There’ll be also the possibility to make routings to certain addresses or Points of Interest. Although the OpenStreetMap Wiki gives some explanations and tipps on bringing OSM to your device, there are some easier ways to do so. But first we have to clarify the question if your device can handle with OpenStreetMap-data: The following devices…

MapServer needs your help

Folks, have you ever questioned yourself how to show a shapefile or your own geotiff on a webmap as a WMS or WFS? MapServer is one thing to do this. Another on is Geoserver which seems to be used more often. MapServer, according to the WIKI entry will have it’s 20th birthday this year. So it’s time for us to support them to get ready for 20 more years.

CLAVIN – open source context-based geotagging

“Big data is coming!” Everyday you can read this in current blogs and magazines. Geotagging is one of the special-interest issues of digital-geography and so I want to combine this two fields and introduce you to CLAVIN, the context-based geotagging service of Berico Technologies. The name of this open source project is a summarize of the main functionality “Cartographic Location And Vicinity Indexer” of documents.

Data extraction and clean up with tabula and open refine

Everyone working with data knows the problem: You found some interesting data for your journalistic project or statistics for preparing a nice map, but the data comes messy and hidden in PDF-files, not automatically readable for your program. Normally you have to write out and clean up the data by hand. But there are tools for that…

Freeware SAR processing (Part 1.)

One thing about working with synethic aperture radar (SAR) data is that regular image processing functions are often unsuitable. This is because most processes were design to deal with issues related to passive multispectral data in the visible-thermal infrared wavelength range. SAR imagery is derived from an active sensor which introduces particular problems or rather requires special solutions. The wavelength range is also very different meaning that the interaction between the energy and target is dissimilar to that of visible-infrared radiation. Hence we need a different set of tools to work with SAR data. If you have the money there…

Install QGIS 2.0 on Ubuntu

Today QGIS 2.0 was officially released and we will come up with several tutorials in the next weeks. First of all: the installation. As we are fans of open source we would like to show you the installation on a fresh build Ubuntu system: Installation on Ubuntu QGIS strongly depends on the grass libraries so as a first step we will install them: As QGIS 2.0 is not part of the official Ubuntu repositories (aka software provider) we need to enhance the list of software providers. Open up the terminal and edit the sources.list which helds this list: Now the…

short announcement: QGIS 2.0.1 Dufour now available on Ubuntu

Times are changing and so should a GIS. Since a long time there was the announcement to release QGIS 2.0 to the public by June. But as there were some blockers in the roadmap the release date was not updated. Everyone suspected a release after the QGIS hackathon and during the FOSS4g conference in Nottingham. Now it is out: Updating your ubuntugis-unstable PPA in Ubuntu will now install the brand new QGIS 2.0.1 Dufour! Enjoy and keep on visiting digital-geography!!! But as Nathan Woodrow (@madmanwoo) answered on my Tweet: “@dig_geo_com @qgis @QGISInfo @qgiswatch /sigh the packages aren’t meant to be…

OpenSource QGIS + PostGIS installation: “the Windows way”

A short time ago I’ve posted an article on the installation of QGIS in combination with a PostGIS database in the background. As we all know, Windows is mostly used as OS on a PC so this is the Windowized version. This is a short summary that sums up the article of a site called Boston GIS. I’ll show you how to install QGIS version 1.8 (which will be updated in some days) and PostgreSQL with PostGIS extension and show you the first steps in the import of shapefiles and raster data.

Python Script for “depth vs. data” plots

Today I want to share a Python script that I wrote to plot some lab data against the core depth it was taken from. I know its not very special if you are a Python guru, but I know that many students and scientists have problems to visualize their data in a proper way. My idea was to collect some ideas and developers who are interested to test and to enhance the script. Also, I want it to be open source, so feel free to fork it on GitHub or give feedback. The usage is not that easy at the moment,…