GRS80 should be recognized as a WGS84 transformation type (#127)

* Fix for transform type WGS84 derection

Signed-off-by: bartels <andreas.bartels@disy.net>

Author: AndreasWBartels

core/src/main/java/org/locationtech/proj4j/BasicCoordinateTransform.java

@@ -15,7 +15,11 @@
  */
 package org.locationtech.proj4j;
 
+import java.util.Objects;
+import java.util.stream.DoubleStream;
+
 import org.locationtech.proj4j.datum.*;
+import org.locationtech.proj4j.util.ProjectionMath;
 
 /**
  * Represents the operation of transforming

core/src/main/java/org/locationtech/proj4j/datum/Datum.java

@@ -23,7 +23,6 @@
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Objects;
 
 import org.locationtech.proj4j.ProjCoordinate;
 
@@ -150,9 +149,8 @@ public double[] getTransformToWGS84() {
     public int getTransformType() {
         if (grids != null && grids.size() > 0) return TYPE_GRIDSHIFT;
 
-        if (Ellipsoid.WGS84.equals(ellipsoid) || Ellipsoid.GRS80.equals(ellipsoid)) {
+       if (Ellipsoid.WGS84.isEqual(ellipsoid) || Ellipsoid.GRS80.isEqual(ellipsoid)) {
             if (transform == null) return TYPE_WGS84;
-
             if (isIdentity(transform)) return TYPE_WGS84;
         }
 
@@ -269,4 +267,4 @@ public void inverseShift(ProjCoordinate xy) {
     public void setGrids(List<Grid> grids) {
         this.grids = grids;
     }
-}
+}

core/src/test/java/org/locationtech/proj4j/datum/TransformerTypeTest.java

@@ -0,0 +1,21 @@
+package org.locationtech.proj4j.datum;
+
+import org.junit.Test;
+import org.locationtech.proj4j.CRSFactory;
+import org.locationtech.proj4j.CoordinateReferenceSystem;
+
+import static org.junit.Assert.assertTrue;
+
+public class TransformerTypeTest {
+
+    private final CRSFactory crsFactory = new CRSFactory();
+
+    @Test
+    public void isTransformerTypeWgs84() {
+
+      String utm32znParameters = "+proj=tmerc +lat_0=0.0 +lon_0=9.0 +k_0=0.9996 +x_0=3.25E7 +y_0=0.0 +a=6378137.0 +f=298.257222101 +pm=Greenwich +units=m +no_defs";
+      CoordinateReferenceSystem utm32znCrs = crsFactory.createFromParameters("Anon", utm32znParameters);
+
+      assertTrue(utm32znCrs.getDatum().getTransformType() == Datum.TYPE_WGS84);
+    }
+}