Hello,
I'm using GeoTools v13.x and Proj.4 v4.9.1. When a WMS layer is brought
into QGIS as EPSG:4326 there is a noticeable offset compared to the same
local layer. The WMS layer source is EPSG:4267.
A WMS 4326 sample point has a coordinate of -97.2341220, 28.0611696 and the
same local 4326 sample point has a coordinate of -97.2339531, 28.0608752.
This is roughly a 40m difference. Some local calculations have shown the
error margin to be <=111m.
Here is the source 4267 definition in GeoTools:
GEOGCS["NAD27",
DATUM["North American Datum 1927",
SPHEROID["Clarke 1866", 6378206.4, 294.9786982138982,
AUTHORITY["EPSG","7008"]],
TOWGS84[2.478, 149.752, 197.726, 0.526, -0.498, 0.501, 0.685],
AUTHORITY["EPSG","6267"]],
PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]],
UNIT["degree", 0.017453292519943295],
AXIS["Geodetic longitude", EAST],
AXIS["Geodetic latitude", NORTH],
AUTHORITY["EPSG","4267"]]
Here is the source 4267 proj.4 definition:
GEOGCS["GCS_North_American_1927",DATUM["D_North_American_1927",SPHEROID["Clarke_1866",6378206.4,294.9786982]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]].
GeoTools is a really great library! Thank you for maintaining and
contributing to it.
Thank you,
Betsy Emmons
Betsy Emmons
Community Support Manager | Boundless <http://boundlessgeo.com/>
*[email protected] <[email protected]>*
908.208.9692 <908-208-9692>
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