RGeo Factories and contians? in geographic domain

[Pratuat Amatya]

I am new to GIS and RGeo.

I was using RGeo::Geographics.spherical_factory for creating polygons and point with lat/lon data.

I am getting following errors on polygon.contains?(point)

RGeo::Error::UnsupportedOperation: Method Geometry#contains? not defined.

from /Users/pratuat/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rgeo-0.3.20/lib/rgeo/feature/geometry.rb:409:in `contains?'

I noticed another post recommended the usage of RGeo::Geos.factory instead but again GEOS is said to be implementation of the SFS using a Cartesian coordinate system. 

So whats the right way to achieve polygon.contains?(point) in geographic coordinate system.

PS: Going through Daniel Azuma's article series, I realized the spatial data I will be using are locale specific and hence it would be good idea to switch to simple_mercator_factory but again the requirements is such that I need to store the locaiton data in lat/lon. How can I work that out ?

[Ken-ichi Ueda]

+1. If this isn't implemented, the documentation should say so. If anyone can recommend an alternative strategy that would be helpful. I'm particularly interested using contains? for polygons that cross longitude 180.

-ken-ichi

[Jules Ivanic]

Hi,

You have to use the RGeo::Geos.factory

Like this for example : 

  self.rgeo_factory_generator = RGeo::Geos.factory_generator
  set_rgeo_factory_for_column(:columnn_name, RGeo::Geographic.simple_mercator_factory)

And one thing very important is to install the system dependancies BEFORE installing the gem, as explain in the last comment of this issue : https://github.com/rgeo/rgeo/issues/52

[ravi.l...@nestaway.com]

Hey,

did you figure out an answer for that ?