Prime Meridians offset from greenwich in degrees

Author: bosborn

CHANGELOG.md

@@ -11,6 +11,7 @@ Adheres to [Semantic Versioning](http://semver.org/).
 * Additional included names in Ellipsoids
 * Ellipsoids saved reciprocal flattening value
 * Prime Meridians name capitalizations
+* Prime Meridians offset from greenwich in degrees
 
 ## [1.1.0](https://github.com/ngageoint/coordinate-reference-systems-java/releases/tag/1.1.0) (10-14-2021)
 

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

@@ -402,4 +402,35 @@ public static double convert(double value, Unit from, Unit to) {
 		return value * (from.getConversionFactor() / to.getConversionFactor());
 	}
 
+	/**
+	 * Determine if values can be converted between the two units
+	 * 
+	 * @param unit1
+	 *            first unit
+	 * @param unit2
+	 *            second unit
+	 * @return true if can convert
+	 * @since 1.1.1
+	 */
+	public static boolean canConvert(Units unit1, Units unit2) {
+		return canConvert(unit1.createUnit(), unit2.createUnit());
+	}
+
+	/**
+	 * Convert the value from a unit to a same typed unit, both with conversion
+	 * factors
+	 * 
+	 * @param value
+	 *            value to convert
+	 * @param from
+	 *            unit to convert from
+	 * @param to
+	 *            unit to convert to
+	 * @return converted value
+	 * @since 1.1.1
+	 */
+	public static double convert(double value, Units from, Units to) {
+		return convert(value, from.createUnit(), to.createUnit());
+	}
+
 }

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

@@ -3,6 +3,8 @@
 import java.util.HashMap;
 import java.util.Map;
 
+import mil.nga.crs.common.Units;
+
 /**
  * Common Prime Meridians
  * 
@@ -92,7 +94,7 @@ public enum PrimeMeridians {
 	private final String name;
 
 	/**
-	 * Offset from greenwich
+	 * Offset from greenwich in radians
 	 */
 	private final double offsetFromGreenwich;
 
@@ -133,14 +135,23 @@ public String getName() {
 	}
 
 	/**
-	 * Get the offset from greenwich
+	 * Get the offset from greenwich in radians
 	 * 
-	 * @return offset longitude
+	 * @return offset longitude in radians
 	 */
 	public double getOffsetFromGreenwich() {
 		return offsetFromGreenwich;
 	}
 
+	/**
+	 * Get the offset from greenwich in degrees
+	 * 
+	 * @return offset longitude in degrees
+	 */
+	public double getOffsetFromGreenwichDegrees() {
+		return Units.convert(offsetFromGreenwich, Units.RADIAN, Units.DEGREE);
+	}
+
 	/**
 	 * Get the prime meridians type from the name
 	 *