[MetaCRS] joseangel@digi21.eu: Error in spatialreference.org]

Frank Warmerdam warmerdam at pobox.com
Thu Apr 26 17:14:15 EDT 2012 

Chris / Jose,

I can confirm that OGRSpatialReference now captures the axis order for
this coordinate system.

warmerdam at gdal:/usr/local/google/upgradegdal/google3$ gdalsrsinfo EPSG:3035

PROJ.4 : '+proj=laea +lat_0=52 +lon_0=10 +x_0=4321000 +y_0=3210000
+ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs '

OGC WKT :
PROJCS["ETRS89 / LAEA Europe",
    GEOGCS["ETRS89",
        DATUM["European_Terrestrial_Reference_System_1989",
            SPHEROID["GRS 1980",6378137,298.257222101,
                AUTHORITY["EPSG","7019"]],
            TOWGS84[0,0,0,0,0,0,0],
            AUTHORITY["EPSG","6258"]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4258"]],
    PROJECTION["Lambert_Azimuthal_Equal_Area"],
    PARAMETER["latitude_of_center",52],
    PARAMETER["longitude_of_center",10],
    PARAMETER["false_easting",4321000],
    PARAMETER["false_northing",3210000],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Y",NORTH],
    AXIS["X",EAST],
    AUTHORITY["EPSG","3035"]]

On Thu, Apr 26, 2012 at 1:45 PM, Christopher Schmidt
<crschmidt at crschmidt.net> wrote:
>
> I *think* that this is just a case of whatever tool generated this
> WKT (gdal/proj) failing to understand that this projection should be
> Y, X instead of X,Y. Does anyone know if this is fixed now, or if I
> need to do more work to get this working right?
>
> -- Chris
>
> ----- Forwarded message from José Ángel Martínez <joseangel at digi21.eu> -----
>
> Date: Thu, 23 Feb 2012 19:32:06 +0100
> From: José Ángel Martínez <joseangel at digi21.eu>
> To: crschmidt at crschmidt.net
> Subject: Error in spatialreference.org
>
> Hello Mr Christopher Schmidt,
>
>
> My name is Jose Angel. I don't know if you are the correct person for this
> email, and I hope not to be boring.
>
> I'm finishing my implementation of coordinate transformations following the
> rules of OpenGIS and I think that I've found an error in the implementation
> you have in your site spatialreference.org in relation of the coordinate
> axis.
>
> The EPSG:3035 coordinate system has the axis changed (first Y and then X).
> You can see it in the EPSG database and also in the test 5110 (Lambert
> Azimuthal Equal Area.) with the next SQL query against the EPSG database:
>
>
> SELECT * FROM [Coordinate Axis] WHERE COORD_SYS_CODE=4532 ORDER BY [ORDER]
>
>
> In this link http://spatialreference.org/ref/epsg/3035/ogcwkt/ your site
> shows the next WKT string:
>
> PROJCS["ETRS89 /
> ETRS-LAEA",GEOGCS["ETRS89",DATUM["European_Terrestrial_Reference_System_1989",SPHEROID["GRS
> 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","6258"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4258"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],PROJECTION["Lambert_Azimuthal_Equal_Area"],PARAMETER["latitude_of_center",52],PARAMETER["longitude_of_center",10],PARAMETER["false_easting",4321000],PARAMETER["false_northing",3210000],AUTHORITY["EPSG","3035"],AXIS
> ["X",EAST],AXIS["Y",NORTH]]
>
> and I think (maybe I'm wrong) that the correct string is this one
> (generated by my implementation):
>
>
> PROJCS["ETRS89 / LAEA Europe",GEOGCS["ETRS89",DATUM["European Terrestrial
> Reference System 1989",SPHEROID["GRS
> 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","6258"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],AXIS["Lat",
> NORTH],AXIS["Long",
> EAST],AUTHORITY["EPSG","4258"]],PROJECTION["Lambert_Azimuthal_Equal_Area"],PARAMETER["latitude_of_center",51.99999999999995],PARAMETER["longitude_of_center",9.999999999999989],PARAMETER["false_easting",4321000],PARAMETER["false_northing",3210000],PARAMETER["semi_major",6378137],PARAMETER["semi_minor",6356752.314140356],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Y",
> NORTH],AXIS["X", EAST],AUTHORITY["EPSG","3035"]]
>
> This is really important because if the implementation is following the
> standard, it have to concatenate an affine transformation to transformate
> from X,Y to Y,X after transforming from geographics to projected
> coordinates.
>
> This is the transformation WKT that generates my implementation for that
> coordinate system, I've marked the affine that switches the axis:
>
> CONCAT_MT[PARAM_MT["Affine", PARAMETER["num_row",3], PARAMETER["num_col",
> 3],PARAMETER["elt_0_0", 0],PARAMETER["elt_0_1", 1],PARAMETER["elt_0_2",
> 0],PARAMETER["elt_1_0", 1],PARAMETER["elt_1_1", 0],PARAMETER["elt_1_2",
> 0],PARAMETER["elt_2_0", 0],PARAMETER["elt_2_1", 0],PARAMETER["elt_2_2",
> 1]],PARAM_MT["Affine", PARAMETER["num_row",3], PARAMETER["num_col",
> 3],PARAMETER["elt_0_0", 0.01745329251994328],PARAMETER["elt_0_1",
> 0],PARAMETER["elt_0_2", 0],PARAMETER["elt_1_0", 0],PARAMETER["elt_1_1",
> 0.01745329251994328],PARAMETER["elt_1_2", 0],PARAMETER["elt_2_0",
> 0],PARAMETER["elt_2_1", 0],PARAMETER["elt_2_2",
> 0.01745329251994328]],PROJECTION["Lambert_Azimuthal_Equal_Area",
> AUTHORITY["EPSG","9820"]],PARAMETER["latitude_of_center",51.99999999999995],PARAMETER["longitude_of_center",9.999999999999989],PARAMETER["false_easting",247575063.2760287],PARAMETER["false_northing",183919452.2369943],PARAMETER["semi_major",6378137],PARAMETER["semi_minor",6356752.314140356],PARAM_MT["Affine",
> PARAMETER["num_row",3], PARAMETER["num_col", 3],PARAMETER["elt_0_0",
> 1],PARAMETER["elt_0_1", 0],PARAMETER["elt_0_2", 0],PARAMETER["elt_1_0",
> 0],PARAMETER["elt_1_1", 1],PARAMETER["elt_1_2", 0],PARAMETER["elt_2_0",
> 0],PARAMETER["elt_2_1", 0],PARAMETER["elt_2_2", 1]],PARAM_MT["Affine",
> PARAMETER["num_row",3], PARAMETER["num_col", 3],PARAMETER["elt_0_0",
> 0],PARAMETER["elt_0_1", 1],PARAMETER["elt_0_2", 0],PARAMETER["elt_1_0",
> 1],PARAMETER["elt_1_1", 0],PARAMETER["elt_1_2", 0],PARAMETER["elt_2_0",
> 0],PARAMETER["elt_2_1", 0],PARAMETER["elt_2_2", 1]]]
>
> And also in your implementation AUTHORITY appears before AXIS and must be
> after it.
>
> Thanks.
>
> ----- End forwarded message -----
>
> --
> Christopher Schmidt
> Web Developer
> _______________________________________________
> MetaCRS mailing list
> MetaCRS at lists.osgeo.org
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-- 
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Software Developer

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