If you're using proj4b in rails you must add the following to your environment.rb file:
config.gem "proj4rb", :lib => "proj4"
and then do "rake gems:install"
Note the ':lib' bit, which I guess enables the wrapped C library within the rails environment in some way.
Without this, I was stuck for a while with an error message: "no implicit conversion to float from nil" occurring on the line where I was calling 'forward' to perform a projection.
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proj4rb in rails [ reply ]