PostGIS and Rails: A Simple Approach

PostGIS is a geospatial extension library for PostgreSQL that allows you to perform a ton of geometric and geographic operations on your data at high speeds. For example: Compute the distance between two points Find all the points within X meters of point P Determine which points are enclosed in polygon P A million other things In Ruby land, there is a gem called RGeo that provides a ton of object

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これやってみたい。