Question 1

How to install and use rgeo-geojson in a Rails app?

Accepted Answer

Add 'gem "rgeo-geojson"' to your Gemfile, run bundle install, and require 'rgeo/geo_json' in your code. Then use RGeo::GeoJSON.decode and .encode methods as shown in the README example for handling GeoJSON data in models or controllers.

Question 2

rgeo-geojson vs geojson gem: which one should I use?

Accepted Answer

Choose rgeo-geojson if you need tight integration with RGeo for geometric operations; it's better for GIS applications. The standalone geojson gem is lighter for basic parsing without RGeo dependencies, but lacks advanced spatial analysis.

Question 3

How to access custom properties from a decoded GeoJSON Feature?

Accepted Answer

After decoding, custom properties are stored as a hash on the feature object. Use feature['property_name'] to retrieve values, similar to the README example where feature['color'] returns 'red'.

Question 4

Does rgeo-geojson support 3D coordinates or only 2D?

Accepted Answer

It depends on RGeo's configuration; RGeo supports 3D geometries, so rgeo-geojson can handle them if set up correctly. Check RGeo's documentation for enabling 3D modes, as the README doesn't specify details.

Question 5

How to encode a complex geometry like a polygon with holes to GeoJSON?

Accepted Answer

Create an RGeo polygon object with holes using RGeo's factory methods, then pass it to RGeo::GeoJSON.encode. The library automatically generates a GeoJSON-compliant hash or JSON string, handling nested structures per the specification.

Question 6

Is rgeo-geojson thread-safe for concurrent usage in web servers?

Accepted Answer

Thread safety relies on RGeo's implementation; geometric objects are generally immutable, but always test in production. Refer to RGeo's documentation for concurrency guarantees, as the README doesn't address this directly.

rgeo-geojson

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