Quickly get the EPSG code from a .prj file or WKT
Project description
Travis CI stuff goes here
Overview
epsg_ident is a command-line utility and Python module for quickly identifying the EPSG Registry Code from a .prj file typically associated with ESRI Shapefiles. It ships with a SQlite3 database containing mappings of Well-known Text strings to EPSG codes, the bulk of which was manually sourced and cleaned from an ESRI website. It’s not complete, however, and in the event you test it against a WKT string not in the database it will search the prj2epsg.org API. If the API returns an exact match, that code is returned and saved to the SQLite database. Handling several partial matches is currently planned, but not yet implemented.
Background
Think of projections as character encoding for spatial data. Spatial data lacking information about the coordinate system on which it has been projected is all but useless, just as if you had text data in an unknown encoding.
Command-Line usage
$ epsg_ident seattle_land_use.prj
2285
Python module usage
>>> from epsg_ident import EpsgIdent
>>> # Read .prj file from the filesystem
>>> ident = EpsgIdent()
>>> ident.read_prj_from_file('seattle_land_use.prj')
>>> ident.get_epsg()
2285
>>> # Paste in Well-Known Text string directly
>>> ident = EpsgIdent(prj="""PROJCS["NAD_1983_StatePlane_Washington_North_FIPS_4601_Feet",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",1640416.666666667],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-120.8333333333333],PARAMETER["Standard_Parallel_1",47.5],PARAMETER["Standard_Parallel_2",48.73333333333333],PARAMETER["Latitude_Of_Origin",47.0],UNIT["Foot_US",0.3048006096012192]]""")
>>> ident.get_epsg()
2285
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