[Benchmarking] WKT for 900913

[Martin Daly]

The WKT for 900913 in spatial_ref_sys was:

PROJCS["Popular Visualisation CRS / Mercator (deprecated)",GEOGCS["Popular Visualisation CRS",DATUM["Popular_Visualisation_Datum",SPHEROID["Popular Visualisation Sphere",6378137,0,AUTHORITY["EPSG","7059"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6055"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4055"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],PROJECTION["Mercator_1SP"],PARAMETER["central_meridian",0],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",0],AUTHORITY["EPSG","3785"],AXIS["X",EAST],AXIS["Y",NORTH]]

Can you spot the mistake? The EBNF element order is wrong (EBNF sequences having strict order according to ISO/IEC 14977).

The correct WKT is:

PROJCS["Popular Visualisation CRS / Mercator (deprecated)",GEOGCS["Popular Visualisation CRS",DATUM["Popular_Visualisation_Datum",SPHEROID["Popular Visualisation Sphere",6378137,0,AUTHORITY["EPSG","7059"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6055"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4055"]],PROJECTION["Mercator_1SP"],PARAMETER["central_meridian",0],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["X",EAST],AXIS["Y",NORTH],AUTHORITY["EPSG","3785"]]

See? Much better. The first two parts - PROJCS and GEOGCS - are correct, but then the order *must* be: PROJECTION; (optional) PARAMETER(s); UNIT; (optional) AXIS(es?); (optional) AUTHORITY.

I have updated the database with that WKT.

IMHO the PostGIS spatial_ref_sys.sql will also need to be fixed, as will whatever produced this WKT: I'm guessing OGR. Just MHO though.

Regards,
Martin

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