Could somebody point me to the correct definition for the google maps
projection (epsg 90013)?
And I guess I need to add it to both the epsg.properties file and also to
the spatial_ref_sys table in postgis?
Thanks,
Steve
Stephen Crawford
Center for Environmental Informatics
The Pennsylvania State University
Stephen Crawford wrote:
Could somebody point me to the correct definition for the google maps
projection (epsg 90013)?
It now has an official code: EPSG:3785
http://www.iter.dk/post/2008/05/SphericalWeb-Mercator-EPSG-code-3785.aspx
--
Ben Caradoc-Davies <Ben.Caradoc-Davies@anonymised.com>
Software Engineer, CSIRO Exploration and Mining
Australian Resources Research Centre
26 Dick Perry Ave, Kensington WA 6151, Australia
Stephen Crawford schrieb:
Could somebody point me to the correct definition for the google maps
projection (epsg 90013)?And I guess I need to add it to both the epsg.properties file and also to
the spatial_ref_sys table in postgis?Thanks,
SteveStephen Crawford
Center for Environmental Informatics
The Pennsylvania State University-------------------------------------------------------------------------
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Steve,
in proj its this:
#Google Mercator projection
<900913> +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs
Regards, Till
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Ben Caradoc-Davies wrote:
Stephen Crawford wrote:
Could somebody point me to the correct definition for the google maps
projection (epsg 90013)?It now has an official code: EPSG:3785
http://www.iter.dk/post/2008/05/SphericalWeb-Mercator-EPSG-code-3785.aspx
And that link has the full definition from EPSG:
******
Full WKT with authorities (untested!):
PROJCS["Popular Visualisation CRS / Mercator", 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", 0.0174532925199433, AUTHORITY["EPSG", "9102"]], AXIS["E", EAST], AXIS["N", NORTH], AUTHORITY["EPSG",4055]], PROJECTION["Mercator"], PARAMETER["False_Easting", 0], PARAMETER["False_Northing", 0], PARAMETER["Central_Meridian", 0], PARAMETER["Latitude_of_origin", 0], UNIT["metre", 1, AUTHORITY["EPSG", "9001"]], AXIS["East", EAST], AXIS["North", NORTH], AUTHORITY["EPSG",3785]]
Projected CRS
COORD_REF_SYS_CODE: 3785
COORD_REF_SYS_NAME: Popular Visualisation CRS / Mercator
AREA_OF_USE_CODE: 3544
COORD_REF_SYS_KIND: projected
COORD_SYS_CODE: 4499
DATUM_CODE:
SOURCE_GEOGCRS_CODE: 4055 (see below)
PROJECTION_CONV_CODE: 19847
CMPD_HORIZCRS_CODE:
CMPD_VERTCRS_CODE:
CRS_SCOPE: Certain Web mapping and visualisation applications.
REMARKS: Uses spherical development. Relative to an ellipsoidal development errors of up to 800 metres in position and 0.7% in scale may arise. Some applications call this WGS 84. It is not a recognised geodetic system: see WGS 84 / World Mercator (CRS code 3395)
INFORMATION_SOURCE: Microsoft.
DATA_SOURCE: OGP
REVISION_DATE: 3/14/2008
CHANGE_ID:
SHOW_CRS: TRUE
DEPRECATED: FALSE
Geographic CRS:
COORD_REF_SYS_CODE: 4055
COORD_REF_SYS_NAME: Popular Visualisation CRS
AREA_OF_USE_CODE: 31262
COORD_REF_SYS_KIND: geographic 2D
COORD_SYS_CODE: 6422
DATUM_CODE: 6055 (see below)
SOURCE_GEOGCRS_CODE:
PROJECTION_CONV_CODE:
CMPD_HORIZCRS_CODE:
CMPD_VERTCRS_CODE:
CRS_SCOPE: Certain Web mapping and visualisation applications.
REMARKS: Some applications erroneously call this WGS 84. It uses a sphere with a radius having the same value as the semi-major axis of the WGS 84 ellipsoid. There is no geodetic recognition of this system.
INFORMATION_SOURCE: Microsoft.
DATA_SOURCE: OGP
REVISION_DATE: 3/13/2008
CHANGE_ID:
SHOW_CRS: TRUE
DATUM_CODE: FALSE
Datum:
Code: 6055
Datum Name: Popular Visualisation
Datum Type: geodetic
Origin Description: Not specified in the classical sense of defining a geodetic datum.
Datum Epoch:
Ellipsoid Code: 7059 (see below)
Prime Meridian Code: 8901
Area Code: 1262
Datum Scope : Used by certain popular Web mapping and visualisation applications.
Remarks: Not recognised by geodetic authorities.
Information Source: Microsoft.
Data Source: OGP
Revision Date: 13-Mar-08
Change ID:
Deprecated: No
Ellipsoid:
Code: 7059
Ellipsoid Name: Popular Visualisation Sphere
Semi-major axis (a): 6378137
Axes units code: 9001
Inverse flattening (1/f):
Semi-minor axis (b): 6378137
Ellipsoid?: No
Remarks: Sphere with radius equal to the semi-major axis of the GRS80 and WGS 84 ellipsoids. Used only for Web approximate mapping and visualisation. Not recognised by geodetic authorities.
Information Source: Microsoft.
Data Source: OGP
Revision Date: 14-Mar-08
Change ID:
Deprecated?: No
******
--
Ben Caradoc-Davies <Ben.Caradoc-Davies@anonymised.com>
Software Engineer, CSIRO Exploration and Mining
Australian Resources Research Centre
26 Dick Perry Ave, Kensington WA 6151, Australia
Stephen Crawford ha scritto:
Could somebody point me to the correct definition for the google maps
projection (epsg 90013)?And I guess I need to add it to both the epsg.properties file and also to
the spatial_ref_sys table in postgis?
Others have linked to the official EPSG code but I still haven't tried
it out and I don't know if it's correctly handled by the GeoTools
referencing subsystem.
The following is the one we're shipping along with GeoServer (paste
it all in one line inside your epsg.properties file):
900913=PROJCS["WGS84 / Google Mercator", GEOGCS["WGS 84", DATUM["World Geodetic System 1984", SPHEROID["WGS 84", 6378137.0, 298.257223563, AUTHORITY["EPSG","7030"]], AUTHORITY["EPSG","6326"]], PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]], UNIT["degree", 0.017453292519943295], AUTHORITY["EPSG","4326"]], PROJECTION["Mercator (1SP)", AUTHORITY["EPSG","9804"]], PARAMETER["semi_major", 6378137.0], PARAMETER["semi_minor", 6378137.0], PARAMETER["latitude_of_origin", 0.0], PARAMETER["central_meridian", 0.0], PARAMETER["scale_factor", 1.0], PARAMETER["false_easting", 0.0], PARAMETER["false_northing", 0.0], UNIT["m", 1.0], AUTHORITY["EPSG","900913"]]
Cheers
Andrea