I'm trying to make uDig use a non-standard CRS (called NDS) on my data, instead
of converting all coordinates to WGS84 before uDig sees them.
My CRS is simply a scaled version of WGS84, where 360° = 2^32. The CRS is
defined by WKT, by replacing the UNIT clause from WGS84 by
UNIT["NDS", 0.000000001462918079267]
The MathTransforms between WGS84 and NDS seem to work.
Now I'm getting the following exception when opening my map:
Caused by: javax.measure.converter.ConversionException: rad*1.462918079267E-9
is not compatible with m
at javax.measure.unit.Unit.getConverterTo(Unit.java:224)
at
net.refractions.udig.project.internal.render.impl.ScaleUtils.fromCrsToMeter(ScaleUtils.java:64)
at
net.refractions.udig.project.internal.render.impl.ScaleUtils.calculateScaleDenominator(ScaleUtils.java:325)
at
net.refractions.udig.project.internal.render.impl.ViewportModelImpl.getScaleDenominator(ViewportModelImpl.java:1048)
at
net.refractions.udig.render.internal.feature.basic.BasicFeatureRenderer.render(BasicFeatureRenderer.java:298)
and the cause for this seems to be the isLatLong() method
/**
* Determines if the crs is a lat/long crs (has angular units)
*
* @return true if the crs is a latlong crs (has angular units)
*/
public static boolean isLatLong(CoordinateReferenceSystem crs) {
Unit<?> unit = getUnit(crs);
Unit<?> degrees = getUnit(DefaultGeographicCRS.WGS84);
boolean isLatLong = CRS.equalsIgnoreMetadata(unit, degrees);
return isLatLong;
}
In fact the comment does not seem to match the implementation. My CRS is a
lat/lon CRS and it has angular units, only the unit is not degree but a
multiple of degree, both are derived from rad.
Is something wrong with my definitions, is there a gap in the ScaleUtils, or
are all my attempts futile, since the implicit assumption lat/long=degrees is
used all over the place....?
Any hints appreciated...
Regards,
Harald
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