Geojson Doctor

A Python utility library for cleaning, normalizing, and transforming GeoJSON geometries.

Developed at Concordia university in Canada as part of the research group from the Next Generation Cities Institute.

It provides functions to:

• Fix invalid geometries.
• Ensure proper polygon ring orientation.
• Removes redundant vertices.
• Add ID field based on properties
• Reproject geometries between coordinate reference systems (CRS).
• Convert single-polygon MultiPolygons to Polygons.
• Remove interior points from Polygons

Usage

pip install geojson-doctor

Imports

from geojson_doctor import fix
from geojson_doctor.transform import change_crs, multipolygon_to_polygon, remove_interior
from geojson_doctor.utilities import generate_ids

Simple example

with open('data/example.geojson', encoding='utf-8') as f:
  data = json.load(f)

data = fix(data)

Full example

with open('data/example.geojson', encoding='utf-8') as f:
  data = json.load(f)

data = generate_ids(data, from_property="name")
data = change_crs(data, 'EPSG:32188', 'EPSG:4326')
data = multipolygon_to_polygon(data, method='keep_first')
data = remove_interior(data)
data = fix(data, workflow=['fix_validity'])

Logging

This package uses Python’s built-in logging to provide warnings whenever geometries are modified.

Modifications to geometry are all applied as a warning. While removed geometries are logged as an error. Use logging level to suppress warnings.

import logging

logging.getLogger().setLevel(logging.ERROR)