[postgis-users] prj2esri.org

[Andrea Aime]

On Tue, Jan 12, 2016 at 3:52 AM, Clifford Snow <clifford at snowandsnow.us>
wrote:

> I'm looking for code to suggest to QGIS developers to use. Right now QGIS
> doesn't recognize Washington State Plane North/South. And besides, I'm
> curious how it's accomplished. Doing it by hand resulted in me picking the
> wrong match!
>

I wrote the first version of site several years ago, it's a simple
application of the GeoTools referencing subsystem, backed by the EPSG
database.
Not sure how it works today, but I can tell you how it used to work back
then.

When you paste a PRJ, first it parses it and tries to perform a match
against the official EPSG database, by first making an indexed
search by projection name and a few other params, falling on a brute force
scan and compare if the first does not match.
If not even that works, then it has a secondary Lucene index with all
projections WKTs stored inside, and it will do a
text based search against it, hoping to find something similar (aka "shot
in the dark").

Hope this helps

Cheers
Andrea

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