Generate a GeoJSON FeatureCollection string from multiple features.

Arguments

• coords — Flat Float64Array with all feature coordinates concatenated
• types — Comma-separated geometry types (one per feature)
• properties_json — Properties for each feature, separated by \x01 (unit separator). Each segment should be a valid JSON object string. Use "{}" for empty properties.

Returns

A JSON string representing a GeoJSON FeatureCollection.

Example (JS)

const coords = new Float64Array([116.4, 39.9, 121.5, 31.2]);
const json = core.geoJsonFeatureCollection(coords, "Point,Point", '{"name":"BJ"}\x01{"name":"SH"}');
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