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Included roads processing and area calculation

Nicolas Garcia Ospina requested to merge tile-area into master

This merge request focuses on refining the built areas with the OBM_roads database, I included 4 new functions:

  • reproject_polygon: manages reprojecting polygons between different crs (generic to be used among other functions)
  • process_dataframe_with_tile: Process any dataframe with the tile specs (meant to be used with roads)
  • polygon_difference: Simple difference between 2 geometries
  • albers_area_calculation: does the albers transformation and calculates the area

I also included a Jupyter notebook for documentation of how a tile is being processed. I think it is important to have this explicit documentation with graphs.

\approve @fd @ds

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