README.md

Points In Poygons

Script performs point-in-polygon (PIP) for multiple points and multiple polygons (raster tile index) and updates the points shapefile with the pixel value from the correct raster.

Dependencies:

• GDAL, must also be in the PATH
• libspatialindex

Install & Setup:

$ git clone git@github.com:dmofot/pnts_n_polys.git
$ cd pnts_n_polys
$ python3 -m venv venv
$ source venv/bin/activate
$ pip install -r requirements.txt

Inputs:

• points_shapefile (in EPSG 4326) - input_pnts.shp
• input_rasters OR raster_tile_index - ./tiles/*.tif OR tile_index_4326.shp

Outputs:

• points_updated_shapefile - input_pnts_updated.shp
• raster_tile_index - tile_index_4326.shp

Examples:

$ python pnts_n_polys.py ./test/test_index_pnts_4326.shp ./test/tiles/*.tif
Loading rasters into tile_index_4326.shp...
Creating new index file...
Loading points from ./test/test_index_pnts_4326.shp...
Building spatial index...
Checking if points are in polygons...
Progress: 100%|█████████████████████████████████████████████████████████████████████████████████████████| 100/100 [00:01<00:00, 93.51pnts/s]
Saving updates to ./test/test_index_pnts_4326_updated.shp...

$ python pnts_n_polys.py ./test/test_index_pnts_4326.shp ./test/tile_index_4326.shp
Loading raster tile index ./test/tile_index_4326.shp...
Loading points from ./test/test_index_pnts_4326.shp...
Building spatial index...
Checking if points are in polygons...
Progress: 100%|█████████████████████████████████████████████████████████████████████████████████████████| 100/100 [00:01<00:00, 96.31pnts/s]
Saving updates to ./test/test_index_pnts_4326_updated.shp...