OSM Streetblocks extraction
This repository contains a Python script (Jupyter notebook) implementing extraction of street blocks from OpenStreetMap (or other sources of vectorial data) using PostGis.
This code was published belong to the following paper:
Grippa & al. Mapping Urban Land Use at Street Block Level Using OpenStreetMap, Remote Sensing Data, and Spatial Metrics. ISPRS Int. J. Geo-Inf. 2018, 7, 246. doi:10.3390/ijgi7070246
Cite this code
Please use the following DOI for citing this code:
Related code
The code provided in this repository could be combined with the one provided in https://github.com/tgrippa/Street_blocks_features_computation, to reproduce the aforementioned research.
Workflow and outputs
The general workflow is as follow:
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Input of the AOI as a polygon
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Creation of tiles for download of OSM data
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Linestrings extracted from OSM
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Extraction of street blocks polygons from linestrings
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Optical image
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Linestrings before snapping using PostGis topology
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Linestrings snapped (using PostGis topology)
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Initial extraction of street blocks - Presence of artifacts polygons
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Final street blocks layer - Artifacts were removed
Known issues
- Some issues could appear on Windows when using 'osm2pgsql' command, regarding to the password for the Postgis databse.
- The resulting layer could contain self-intersecting polygons. Add extra step should be added after the extraction of the block in order to check is there are self-interecting polygons, and fix them in this case.