Pro tip for overturemaps building footprint downloads: While the official data download can be tricky, explore.overturemaps.org is a handy alternative (though limited to zoom 15). Need to check multiple areas? Here's a QGIS field calculator hack:
'https://explore.overturemaps.org/#15/' || to_string(y(centroid($geometry)), 5) || '/' || to_string(x(centroid($geometry)), 5)
This generates clickable URLs for each grid cell! 
#QGIS #OpenData #overturemaps
Trying to take a look at ways to measure contrast and accessibility of maps.
Here, looking at OpenStreetMap tiles, and contrast
Used QGIS raster calculator to convert to greyscale (by luminance), then applied the whiteboxtools 'range filter' with a 3x3 kernel
Colourised with Rocket colour scale. Yellow and white show the highest contrast, black is areas of solid colour.
@arnaud_vandecasteele @panoramax @LizmapForQgis @lizmapforqgis@bird.makeup voilà qui sera complémentaire avec le plugin pour #QWC https://metrotopic.net/post/panoramax_qwc_web
I have a raster where each cell is categorized with a value of either 1, 2 or 3.
In #QGIS, how would I determine the percentage of cells in each category?
Discuss.
The largest competitor to proprietary #GIS is open source software and tools – #FOSSGIS infrastructure is now at a level where municipalities and companies shift away from proprietary solutions. Would anyone happen to have any material (case studies etc.) on this topic to prove this point?
#QGIS #Esri #Geospatial
Afgelopen vrijdag verzorgden we vanuit #QGISNL 2 workshops tijdens de Open GIS 3D Studiedag voor gemeenten, georganiseerd door @gemeenteamsterdam, #VNG Realisatie & @osgeonl: @hansakwast over puntenwolken en #3D visualisatie in #QGIS & @terglobo over 3D-data exporteren van QGIS naar #Blender3D. Het was een heel nuttige dag om kennis uit te wisselen over #opensource 3D-technologie! #OSGeoNL #GIS
Les inscriptions aux #QGISFR2025 ouvrent à 14h !
N'oubliez pas la 3e journée, qui vous permettra cette année de poser votre 1e pierre à l'édifice #QGIS !
RDV sur le site des rencontres https://conf.qgis.osgeo.fr/z25_inscription.html pour obtenir votre sésame pour Avignon!
Dépêchez-vous, les places sont limitées!
Die FOSS Academy ist das Schulungsinstitut der WhereGroup.
„Aufwind durch Wissen“ – unter diesem Motto veranstaltet die FOSS Academy praxisorientierte Schulungen zum Thema „GIS mit Open Source Software“ Wir bieten Schulungen zu #OpenStreetMap #PostGIS #QGIS #Mapbender #MapServer #GeoServer #MapProxy #GDI #OpenSource #Geospatial #FOSSGIS #OSGeo & mehr
#FOSSGIS2025
Do #QGIS pre- and postprocessing scripts work for anyone (especially in 3.40)?
https://docs.qgis.org/3.40/en/docs/training_manual/processing/hooks.html
Whatever I put in there, nothing seems to be executed. No print(), no QgsMessageLog.logMessage, no Path.touch()
Example script for testing:
from pathlib import Path
Path("/tmp/preprocessing").touch()
I have a #GDAL / #QGIS question for the #GIS commnunity in the Fediverse #askFedi concerning the use of geolocation arrays in raster datsets, i.e. in bands the hold (for example) the latitude and longitude of each cell in the raster.
I'm used to produce datasets in UTM format, for which adding the appropriate georeference metadata is simple. However, in this case I'm producing a raster dataset where the cells are distributed in a “warped” area (think aerial imagery with non-affine transform from data matrix to geo coordinates). I have arrays holding resp. the latitude and longitude of each pixel, and can add it to the dataset, I can specify the GCRS (lat/lon WGS84), but I can't seem to be able to find the metadata to add to the raster so that the goelocation arrays are correctly identified as such.
Online there seems to be only sparse documentation about this, generally implying that this is only supported for specific dataset types in specific formats (usually, the standard format from common satellite data) and the only pages I've found on how to “roll your own” refer to a single old-ish mailing list contribution that recommends the use of a sidecar VRT file. Are there any more modern solutions possible?
Nach der #FOSSGIS2025 Lust auf mehr Know-How-Aufbau rund um #OpenSource #GEOSPATIAL? Die FOSS Academy bietet zahlreiche Schulungen an zu #Mapbender #PostGIS #QGIS #MapServer #GeoServer #NAS #MapProxy #OSM & mehr
https://foss-academy.com/ #FOSSGIS #OSGeo
Thank you to #Kone & Mai and Tor Nessling Foundations for supporting this work. A quantitative work like this would not be possible without a robust suite of FOSS tools. My thanks to the maintainers of #QGIS, #pandas, #geopandas, #duckdb, #dask, #statsmodels, #jupyter and many more!
Weiter gehts gleich mit #QGIS im Teamplay mit #Blender3d
https://pretalx.com/fossgis2025/talk/BDV3YY/
I am toying with the idea to build a (physical) globe myself. Preferably using #QGIS and maybe Inkscape for final touches (or other OS tools).
I would like to design the globe as far as possible in QGIS and then use an appropriate projection to output the lobes. Then glue to a sphere using wallpaper glue etc. - I imagine it difficult to get the labels right.
Surprisingly, I can find few resources on how to approach such a project.
Any pointers or own experience?
Did you attend the presentation on G3W-SUITE this morning at FOSSGIS2025? Are you curious and want to see it in action and learn how it works? We look forward to seeing you tomorrow morning at 9:00 AM (BoF3/Exp. (Senatssaal)).
Hast du heute Morgen auf der FOSSGIS2025 die Präsentation über G3W-SUITE gesehen? Bist du neugierig und möchtest es in Aktion sehen und erfahren, wie es funktioniert? Dann erwarten wir dich morgen früh um 9:00 Uhr (BoF3/Exp. (Senatssaal)).
We’re proud to partner with Oslandia on the new #QGIS Security Initiative!
This community-funded project will help QGIS meet modern security standards (CRA, NIS2), improve code and plugin security, and strengthen trust across the ecosystem.
Support the initiative and learn more at https://security.qgis.oslandia.com or talk to us at #FOSSGIS2025
