Exercise solution for vector format conversion

1. Convert to GeoJSON

   $ gdal vector convert timisoara.osm.pbf out_points.geojson --input-layer points
   $ gdal vector convert timisoara.osm.pbf out_lines.geojson --input-layer lines
   $ gdal vector convert timisoara.osm.pbf out_multilinestrings.geojson --input-layer multilinestrings
   $ gdal vector convert timisoara.osm.pbf out_multipolygons.geojson --input-layer multipolygons
   $ gdal vector convert timisoara.osm.pbf out_other_relations.geojson --input-layer other_relations
   

2. "Exploding" collections in single primitives (points, lines, polygons).

   $ gdal vector explode-collections timisoara.osm.pbf timisoara.gpkg --overwrite
   

3. Create a layer for each geometry type

   $ gdal vector filter timisoara.gpkg other_relations_points.gpkg \
       --input-layer other_relations  --where "ST_GeometryType(geom) = 'POINT'" --overwrite
   
   $ gdal vector filter timisoara.gpkg other_relations_lines.gpkg \
       --input-layer other_relations  --where "ST_GeometryType(geom) = 'LINESTRING'" --overwrite
   
   $ gdal vector filter timisoara.gpkg other_relations_polygons.gpkg \
       --input-layer other_relations  --where "ST_GeometryType(geom) = 'POLYGON'" --overwrite