common types and proj parsing updates

Author: bosborn

src/main/java/mil/nga/crs/common/Units.java

@@ -266,7 +266,7 @@ public Unit createUnit() {
 	 *            unit name
 	 * @return units type
 	 */
-	public static Units getType(String name) {
+	public static Units fromName(String name) {
 		return nameTypes.get(name.toLowerCase());
 	}
 
@@ -277,8 +277,8 @@ public static Units getType(String name) {
 	 *            unit
 	 * @return units type
 	 */
-	public static Units getType(Unit unit) {
-		return getType(unit.getName());
+	public static Units fromUnit(Unit unit) {
+		return fromName(unit.getName());
 	}
 
 	/**

src/main/java/mil/nga/crs/geo/Ellipsoid.java

@@ -229,6 +229,23 @@ public void addIdentifiers(List<Identifier> identifiers) {
 		this.identifiers.addAll(identifiers);
 	}
 
+	/**
+	 * Get the pole radius
+	 *
+	 * @return pole radius
+	 */
+	public double getPoleRadius() {
+		double poleRadius;
+		if (inverseFlattening != 0) {
+			double flattening = 1.0 / inverseFlattening;
+			double eccentricity2 = 2 * flattening - flattening * flattening;
+			poleRadius = semiMajorAxis * Math.sqrt(1.0 - eccentricity2);
+		} else {
+			poleRadius = semiMajorAxis;
+		}
+		return poleRadius;
+	}
+
 	/**
 	 * {@inheritDoc}
 	 */