A program for extracting polygons from Microsoft's GlobalMLBuildingFootprints data, which are located inside a specified bounding box.
This data is in GeoJSONL format, which means every GeoJSON feature is on its own line. The program enumerates every line and checks if at least one of the coordinates of the polygon is inside a bounding box. In this case, the feature is written to the output file.
The output file is already in GeoJSON format to ensure maximum compatibility with programs that cannot parse GeoJSONL (yet).
Since the input files are pretty big (Germany has nearly 10 GiB), the files are not loaded into memory but parsed line by line. Running this program with the Germany extract processed over 28 million polygons and took about eight minutes on a nearly ten year old CPU with about 8 MiB RAM usage.
- .NET Core 3.1 runtime
- 64 bit Operating System
Tested on Debian 11 and Windows 7. Output files were successfully loaded in QGIS 3.26.
bbox-extractor Infile MinLon MinLat MaxLon MaxLat [Outfile]
Infile Path to source file in GeoJSONL format
MinLon Minimum longitude
MinLat Minimum latitude
MaxLon Maximum longitude
MaxLat Maximum latitude
Outfile Path to file with extracted polygons in GeoJOSN format
If not specified, the file will be saved in the
same directory as the Infile.
bbox-extractor D:\Germany.geojsonl 10.2 50.1 11.9 51.6
Process the polygons located in D:\Germany.geojsonl and save every polygon inside the bounding box 10.2 50.1 11.9 51.6 in the file D:\Germany-extracted.geojson.
- Download source file from Microsoft
- Extract it
- Choose your bounding box using Geofabrik's excellent Tile Calculator
- Run
bbox-extractorwith the source file and the chosen bounding box - If needed convert the GeoJSON to OSM XML
- ...
- Profit!
- CommunityToolkit (© .NET Foundation and Contributors; MIT license)
MIT License (see LICENSE)