Judging by the classes in the org.geotools.referencing.operation.projection
package, it doesn't appear that GeoTools supports Cylindrical Equal Area
projections:
https://github.com/geotools/geotools/tree/master/modules/library/referencing/src/main/java/org/geotools/referencing/operation/projection
Any hints on how to implement a Cylindrical Equal Area projection?
I have stubbed out a CylindricalEqualArea class that extends MapProjection and
assigned it to the org.geotools.referencing.operation.projection package.
What else should I do? Is there some way to register the class?
Also, I noticed that most of the projections have a static class called
"Provider" that extends "AbstractProvider". The Provider class has a
ParameterDescriptorGroup with keywords for OGC, ESRI, EPSG, etc.
There is also a GEOTOOLS key. For example, the EquidistantCylindrical class has
something like this:
new NamedIdentifier(Citations.GEOTOOLS,
Vocabulary.formatInternational(
VocabularyKeys.EQUIDISTANT_CYLINDRICAL_PROJECTION))
I guess I need to add an entry in VocabularyKeys as well?
Anything else?
Thanks in advance,Peter
From: Peter Borissow <peter.boris...@yahoo.com>
To: Geotools-gt2-users <geotools-gt2-users@lists.sourceforge.net>
Sent: Thursday, March 19, 2015 1:27 PM
Subject: Re: Behrmann Projection
Quick update. I tried to hand code the Behrmann projection using a
"Cylindrical_Equal_Area" with a standard parallel of 30 degrees:
String behrmannWKT =
"PROJCS[\"World_Behrmann\"," +
"GEOGCS[\"GCS_WGS_1984\"," +
"DATUM[\"WGS_1984\"," +
"SPHEROID[\"WGS_1984\",6378137,298.257223563]]," +
"PRIMEM[\"Greenwich\",0]," +
"UNIT[\"Degree\",0.017453292519943295]]," +
"PROJECTION[\"Cylindrical_Equal_Area\"]," +
"PARAMETER[\"False_Easting\",0]," +
"PARAMETER[\"False_Northing\",0]," +
"PARAMETER[\"Central_Meridian\",0]," +
"PARAMETER[\"Standard_Parallel_1\",30]," +
"UNIT[\"Meter\",1]," +
"AUTHORITY[\"EPSG\",\"54017\"]]";
CoordinateReferenceSystem crs = CRS.parseWKT(behrmannWKT);
Throws:
org.opengis.referencing.NoSuchIdentifierException: No transform for
classification "Cylindrical_Equal_Area".
Does geotools support any Cylindrical Equal Area Projections?
http://www.remotesensing.org/geotiff/proj_list/cylindrical_equal_area.html
From: Peter Borissow <peter.boris...@yahoo.com>
To: Geotools-gt2-users <geotools-gt2-users@lists.sourceforge.net>
Sent: Thursday, March 19, 2015 12:14 PM
Subject: Behrmann Projection
Hello- I would like to create a map using the Behrmann Equal Area Projection
(EPSG:54017). GeoTools doesn't seem to like this projection. When I call
CRS.decode("EPSG:54017") I'm getting the following exception:
org.opengis.referencing.FactoryException: Error in "PROJECTION": No transform
for classification "Behrmann".
When I try to pass in a Proj4 style string but I get a different exception.
CRS.decode("+proj=cea +lon_0=0 +lat_ts=30 +x_0=0 +y_0=0 +datum=WGS84
+ellps=WGS84 +units=m +no_defs")
Throws:
org.opengis.referencing.NoSuchAuthorityCodeException: No authority was defined
for code "+PROJ=CEA +LON_0=0 +LAT_TS=30 +X_0=0 +Y_0=0 +DATUM=WGS84 +ELLPS=WGS84
+UNITS=M +NO_DEFS". Did you forget "AUTHORITY:NUMBER"?
Any suggestions?
Thanks,Peter
Related
links:http://spatialreference.org/ref/esri/54017/http://mathworld.wolfram.com/BehrmannCylindricalEqual-AreaProjection.html
http://sourceforge.net/p/geoserver/mailman/message/24472263/
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