Hi Harald: I am not sure what ScaleUtils is doing here; I expect there is a gap. I think the assumption is about "units" rather than the name "lat" or "long". I suspect Jesse has an optimized path for lat/long and this method is used to check what is going on before taking a longer more expensive code path involving transformations?
Have a look at what calls this method? Also note we may need to teach the java units system about "NDS" in order to get this to work. Jody On Thu, Apr 9, 2009 at 2:11 AM, Wellmann, Harald <[email protected]> wrote: > 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 > > ******************************************* > innovative systems GmbH Navigation-Multimedia > Geschaeftsfuehrung: Edwin Summers - Michael Juergen Mauser > Sitz der Gesellschaft: Hamburg - Registergericht: Hamburg HRB 59980 > > ******************************************* > Diese E-Mail enthaelt vertrauliche und/oder rechtlich geschuetzte > Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail > irrtuemlich erhalten haben, informieren Sie bitte sofort den Absender und > loeschen Sie diese Mail. Das unerlaubte Kopieren sowie die unbefugte > Weitergabe dieser Mail ist nicht gestattet. > This e-mail may contain confidential and/or privileged information. If you > are not the intended recipient (or have received this e-mail in error) please > notify the sender immediately and delete this e-mail. Any unauthorized > copying, disclosure or distribution of the contents in this e-mail is > strictly forbidden. > ******************************************* > _______________________________________________ > User-friendly Desktop Internet GIS (uDig) > http://udig.refractions.net > http://lists.refractions.net/mailman/listinfo/udig-devel > _______________________________________________ User-friendly Desktop Internet GIS (uDig) http://udig.refractions.net http://lists.refractions.net/mailman/listinfo/udig-devel
