| http://www.w3.org/ns/prov#value | - And after a while it is OK.Here is a part of my code :AGSGeometryEngine *ge = [AGSGeometryEngine defaultGeometryEngine]; AGSEnvelope *actualEnv = (AGSEnvelope *)[ge projectGeometry:self.mapView.visibleArea.envelope toSpatialReference:self.spaRef] ; double xLength = actualEnv.xmax - actualEnv.xmin; With this, the actualEnv.xmax has a 0.0 value.
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