[Geoserver-users] Rotated pole coordinate system

GeoServer GeoServer User
1

Hi,

is it possible to define in geoserver a custom coordinate system to handle rotated pole coordinates, quite common in NWP world?

Here is WKT working with gdal_translate. Last line is the key one, of course.

PROJCS["unnamed",
     GEOGCS["WGS 84",
         DATUM["WGS_1984",
             SPHEROID["WGS 84",6378137,298.257223563,
                 AUTHORITY["EPSG","7030"]],
             TOWGS84[0,0,0,0,0,0,0],
             AUTHORITY["EPSG","6326"]],
         PRIMEM["Greenwich",0,
             AUTHORITY["EPSG","8901"]],
         UNIT["degree",0.0174532925199433,
             AUTHORITY["EPSG","9108"]],
         AUTHORITY["EPSG","4326"]],
     PROJECTION["custom_proj4"],
     EXTENSION["PROJ4","+proj=ob_tran +o_proj=longlat +to_meter=0.0174533 +lon_0=-180 +o_lat_p=37.5 +o_lon_p=199.3 +ellps=WGS84 +datum=WGS84 +wktext +no_defs"]]

Regards

Maciej

2

Hi Maciej,

the specification of a user-defined CRS is explained in http://docs.geoserver.org/stable/en/user/advanced/crshandling/customcrs.html.
We specified a new CRS for the COSMO NWP model (http://www.cosmo-model.org/ ) as follows:

PROJCS["COSMO projection",
  GEOGCS["COSMO Coordinate System",
    DATUM["COSMO Kugel", SPHEROID["Erdkugel", 6371229.0, 0.0]],
    PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]],
    UNIT["degree", 0.017453292519943295],
    AXIS["Longitude", EAST],
    AXIS["Latitude", NORTH]],
  PROJECTION["Rotated_Latitude_Longitude"],
  PARAMETER["central_meridian", -170.0],
  PARAMETER["latitude_of_origin", 40.0],
  PARAMETER["scale_factor", 1.0],
  PARAMETER["false_easting", 0.0],
  PARAMETER["false_northing", 0.0],
  UNIT["m", 1.0],
  AUTHORITY["EPSG","1000003"]]

The COSMO model uses a "rotated latitude longitude" projection. This projection is not supported by GeoServer. If you wish then I can provide you the Java class that has to be added to the gt-referencing.jar library.

Kind regards,
Jürgen

-----------------------------------
Dr. Jürgen Seib
Deutscher Wetterdienst
TI1/K - IT-Koordination
Frankfurter Strasse 135
63067 Offenbach
Tel.: +496980622609
EMail: juergen.seib@anonymised.com

-----Ursprüngliche Nachricht-----
Von: Maciej Filocha [mailto:m.filocha@anonymised.com]
Gesendet: Freitag, 8. Mai 2015 11:41
An: GeoServer Mailing List List
Betreff: [Geoserver-users] Rotated pole coordinate system

Hi,

is it possible to define in geoserver a custom coordinate system to handle rotated pole coordinates, quite common in NWP world?

Here is WKT working with gdal_translate. Last line is the key one, of course.

PROJCS["unnamed",
     GEOGCS["WGS 84",
         DATUM["WGS_1984",
             SPHEROID["WGS 84",6378137,298.257223563,
                 AUTHORITY["EPSG","7030"]],
             TOWGS84[0,0,0,0,0,0,0],
             AUTHORITY["EPSG","6326"]],
         PRIMEM["Greenwich",0,
             AUTHORITY["EPSG","8901"]],
         UNIT["degree",0.0174532925199433,
             AUTHORITY["EPSG","9108"]],
         AUTHORITY["EPSG","4326"]],
     PROJECTION["custom_proj4"],
     EXTENSION["PROJ4","+proj=ob_tran +o_proj=longlat
+to_meter=0.0174533 +lon_0=-180 +o_lat_p=37.5 +o_lon_p=199.3
+ellps=WGS84 +datum=WGS84 +wktext +no_defs"]]

Regards

Maciej

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3

On Fri, May 8, 2015 at 3:01 PM, Seib Jürgen <Juergen.Seib@anonymised.com> wrote:

Hi Maciej,

the specification of a user-defined CRS is explained in
http://docs.geoserver.org/stable/en/user/advanced/crshandling/customcrs.html
.
We specified a new CRS for the COSMO NWP model (
http://www.cosmo-model.org/ ) as follows:

PROJCS["COSMO projection",
  GEOGCS["COSMO Coordinate System",
    DATUM["COSMO Kugel", SPHEROID["Erdkugel", 6371229.0, 0.0]],
    PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]],
    UNIT["degree", 0.017453292519943295],
    AXIS["Longitude", EAST],
    AXIS["Latitude", NORTH]],
  PROJECTION["Rotated_Latitude_Longitude"],
  PARAMETER["central_meridian", -170.0],
  PARAMETER["latitude_of_origin", 40.0],
  PARAMETER["scale_factor", 1.0],
  PARAMETER["false_easting", 0.0],
  PARAMETER["false_northing", 0.0],
  UNIT["m", 1.0],
  AUTHORITY["EPSG","1000003"]]

The COSMO model uses a "rotated latitude longitude" projection. This
projection is not supported by GeoServer. If you wish then I can provide
you the Java class that has to be added to the gt-referencing.jar library.

Why not contribute it to the main GeoTools library? We are getting a number
of
extra projections contributed by various parties this semester

Cheers
Andrea

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