Schlagwort-Archive: GIS

Fedora and QGIS-Flatpak – LTS versus recent version

Just for fun I gave Fedora and Gnome with version 34 a try again 🙂 One of the first things to do as a geoscientist has been the installation of QGIS… because of the not always up-to-date repo versions (and COPR), I selected the Flatpak-version… but got 3.16 LTS alltough I expected it to be 3.18.2 :-/ What I did not know, Flathub encapsulates 2 versions in one “Repo”.

Fedora and QGIS-Flatpak – LTS versus recent version weiterlesen

MongoDB and geodata part 2 – getting spatial

After importing geodata from the GIS to MongoDB and creating a spatial index (part 1), the exciting (spatial) adventure starts. With “normal” (relational) databases and their spatial extensions (Oracle spatial, PostgreSQL/PostGIS, SQLite/Spatialite,…) a lot of spatial queries and geoprocessing are possible. So let’s try to find out which adresses have to be evacuated 250m around some “event”…

QGIS_Adressen_Umkreis
How to perform a spatial query like this with MongoDB ?

MongoDB and geodata part 2 – getting spatial weiterlesen

NTv2 Transformation to ETRS89 for Austria(MGI) the commmand-line way (ogr2ogr)

Sometimes (eg. doing it for a bulk of geodatasets) converting and transforming geodatasets from their Source-CRS to another with command line tools like ogr2ogr (http://www.gdal.org/ ) can be helpful.

With ogr2ogr it’s also an easy task to use NTv2-based transformations like for Austria the AT_GIS_GRID.

NTv2 Transformation to ETRS89 for Austria(MGI) the commmand-line way (ogr2ogr) weiterlesen