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#qgis

18 posts17 participants2 posts today

Thanks to massive support by our fellow QGIS friends at @oslandia, we @wheregroup are proud to release a new version of the Profile Manager #QGIS plugin

It allows you to copy data sources and other things between profiles, export profiles for the QGIS Deployment Toolbelt etc.

Check it out!
(And please handle it with care still, it is not too well tested yet. It does create backups without asking you btw.)

plugins.qgis.org/plugins/profi

Used Python to quickly scrape megalithic.co.uk to get 75 prehistoric sites in Shetland, download shetland.gov.uk's paths and routes shapefiles, then upload them all to my phone with QField and an Thunderforest topo map...

Megalithic basic API: megalithic.co.uk/modules.php?o

Shetland Access Routes & Core Paths: shetland.gov.uk/downloads/down

Thunderforest: thunderforest.com/docs/map-til

QField qfield.org/

after a whole day of morning of trying to figure out how to extract "bare rock" from aerial imagery of the Scilly Isles, I just went to overpass-turbo.eu/ and exported polygons marked "bare rock" from OpenStreetMap. Along with DTM data from environment.data.gov.uk/survey can now run a simple analysis to pinpoint rock outcrops above 10m asl - potential sites for Great Black Back Gulls to nest

overpass-turbo.euoverpass turboA web based data mining tool for OpenStreetMap which runs any kind of Overpass API query and shows the results on an interactive map.
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@dasgrueneblatt Locally, you can easily display #OsmAnd favorites by just open it in #JOSM, but it does not looks very nice. For local customization, it is quite easy to enable labels with just a few clicks in #QGIS. Or (esp. if you want to publish the map) you can use service like umap.openstreetmap.de (you also need to enable labels either as always-on or on-popup in GPX layer)

umap.openstreetmap.deuMap - Online map creatoruMap lets you create maps with OpenStreetMap layers in a minute and embed them in your site.

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.

The largest competitor to commercial #GIS is open source software and tools – #FOSSGIS infrastructure is now at a level where municipalities and companies shift away from commercial solutions. Would anyone happen to have any material (case studies etc.) on this topic to prove this point?
#QGIS #Esri #Geospatial

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?

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?