Question 1

How do I fix a GeoJSON file that crosses the antimeridian using Python?

Accepted Answer

Install antimeridian via pip, then use `antimeridian.fix_geojson()` on your GeoJSON dictionary. For batch processing, install the CLI extras and run `antimeridian fix input.json > output.json` from the terminal.

Question 2

What's the difference between antimeridian and general geometry libraries like shapely?

Accepted Answer

antimeridian is specialized for splitting geometries at the 180th meridian to ensure GeoJSON compliance, whereas shapely provides broader geometric operations but doesn't handle antimeridian crossings natively. It's a niche tool for a specific problem.

Question 3

Does antimeridian work with large datasets or is it too slow?

Accepted Answer

While efficient for typical use, the splitting algorithm involves computational geometry that may not scale well to massive datasets; performance depends on geometry complexity, so testing with your data is advised.

Question 4

How to handle antimeridian issues in JavaScript instead of Python?

Accepted Answer

Use the TypeScript port available at https://github.com/krisaoe/antimeridian-ts, which offers similar functionality for Node.js or browser-based geospatial applications.

Question 5

Can antimeridian fix geometries in shapefiles or do I need to convert first?

Accepted Answer

No, it only supports GeoJSON, Shapely objects, and __geo_interface__; you must convert shapefiles or other formats to one of these compatible types before using the library.

Question 6

What happens to properties in GeoJSON features when antimeridian splits them?

Accepted Answer

Properties are preserved in the corrected features; the library ensures data integrity by retaining all metadata after splitting geometries, as per GeoJSON standards.

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