Add Projection.toMeters method to convert a distance in the projection's native units to meters.

Author: jericks

src/main/groovy/geoscript/proj/Projection.groovy

@@ -5,6 +5,7 @@ import geoscript.geom.Bounds
 import org.geotools.geometry.jts.GeometryCoordinateSequenceTransformer
 import org.geotools.metadata.iso.citation.Citations
 import org.geotools.referencing.CRS
+import org.geotools.renderer.lite.RendererUtilities
 import org.opengis.referencing.crs.CoordinateReferenceSystem
 import org.opengis.referencing.operation.MathTransform
 
@@ -128,6 +129,15 @@ class Projection {
         }
     }
 
+    /**
+     * Convert a distance in the Projection's native units to meters.
+     * @param distance A distance in the Projection's native units
+     * @return The distance in meters
+     */
+    double toMeters(double distance) {
+        RendererUtilities.toMeters(distance, crs)
+    }
+
     /**
      * Transform the Geometry to another Projection
      * @param geom The Geometry

src/test/groovy/geoscript/proj/ProjectionTestCase.groovy

@@ -166,5 +166,12 @@ class ProjectionTestCase {
     @Test void hasEpsgExtension() {
         assertNotNull new Projection("EPSG:104905")
     }
+
+    @Test void toMeters() {
+        Projection p = new Projection("EPSG:2927")
+        double meters = p.toMeters(5280)
+        assertEquals(1609.3472, meters, 0.001)
+    }
+
 }