Hello, how can i transform a WMSLayer, or Layer from a WMS into a different
CRS?
I read how to transform JTS Geometries and how to transform GridCoverages,
but could not find any information on how to do this with WMSLayers.
So i start by getting the Layers from the service and setting the desired
CRS at the viewport. But how do i transform the layers now? I already
heard, that the transformation should be done if the CRS is set, before the
Layer is added. But trying this results in an invisible layer, so i assume
no transformation was done.
I could only fix visibility by
adding mapcontent.getViewport().setBounds(displayLayer.getBounds()); but
this sets the CRS right back to the original CRS of the WMS Layer.
WebMapServer wms = new WebMapServer(new URL("
https://www.geoportal-gruenheide.de/isk/grue_fp01?";));
List<Layer> wmsLayers = WMSLayerChooser.showSelectLayer(wms);
MapContent mapcontent = new MapContent();
mapcontent.getViewport().setCoordinateReferenceSystem(DefaultGeographicCRS.WGS84);
for (Layer wmsLayer : wmsLayers) {
WMSLayer displayLayer = new WMSLayer(wms, wmsLayer);
final CoordinateReferenceSystem targetCRS = DefaultGeographicCRS.WGS84;
// transform the displayLayer, so it is in the targetCRS
mapcontent.addLayer(displayLayer);
}
JMapFrame.showMap(mapcontent);
I also tried to transform the Geometries, but that did not work at all:
final SimpleFeatureIterator sFeatureIt =
displayLayer.toFeatureCollection().features();
while (sFeatureIt.hasNext()) {
final SimpleFeature sFeature = sFeatureIt.next();
final Geometry geometry = JTS.transform((Geometry)
sFeature.getDefaultGeometry(),
CRS.findMathTransform(displayLayer.getCoordinateReferenceSystem(),
targetCRS));
sFeature.setDefaultGeometry(geometry);
}
I thought about getting the GridCoverage from the Layer, to transform it
via resample, but could not find a way to do that either.
Or do i need to write a custom getMap request to set the CRS parameter to
what i want, because transformation afterwards is not possible?
Greetings, Jones
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