import org.onap.aaf.misc.env.util.Split;
public class GreatCircle {
- // Note: multiplying by this constant is faster than calling Math equivalent function
- private static final double DEGREES_2_RADIANS = Math.PI/180.0;
-
- public static final double DEGREES_2_NM = 60;
- public static final double DEGREES_2_KM = DEGREES_2_NM * 1.852; // 1.852 is exact ratio per 1929 Standard Treaty, adopted US 1954
- public static final double DEGREES_2_MI = DEGREES_2_NM * 1.1507795;
-
- /**
- *
- * Calculate the length of an arc on a perfect sphere based on Latitude and Longitudes of two points
- * Parameters are in Degrees (i.e. the coordinate system you get from GPS, Mapping WebSites, Phones, etc)
- *
- * L1 = Latitude of point A
- * G1 = Longitude of point A
- * L2 = Latitude of point B
- * G2 = Longitude of point B
- *
- * d = acos (sin(L1)*sin(L2) + cos(L1)*cos(L2)*cos(G1 - G2))
- *
- * Returns answer in Degrees
- *
- * Since there are 60 degrees per nautical miles, you can convert to NM by multiplying by 60
- *
- * Essential formula from a Princeton website, the "Law of Cosines" method.
- *
- * Refactored cleaned up for speed Jonathan 3/8/2013
- *
- * @param latA
- * @param lonA
- * @param latB
- * @param lonB
- * @return
- */
- public static double calc(double latA, double lonA, double latB, double lonB) {
- // Formula requires Radians. Expect Params to be Coordinates (Degrees)
- // Simple ratio, quicker than calling Math.toRadians()
- latA *= DEGREES_2_RADIANS;
- lonA *= DEGREES_2_RADIANS;
- latB *= DEGREES_2_RADIANS;
- lonB *= DEGREES_2_RADIANS;
+ // Note: multiplying by this constant is faster than calling Math equivalent function
+ private static final double DEGREES_2_RADIANS = Math.PI/180.0;
+
+ public static final double DEGREES_2_NM = 60;
+ public static final double DEGREES_2_KM = DEGREES_2_NM * 1.852; // 1.852 is exact ratio per 1929 Standard Treaty, adopted US 1954
+ public static final double DEGREES_2_MI = DEGREES_2_NM * 1.1507795;
+
+ /**
+ *
+ * Calculate the length of an arc on a perfect sphere based on Latitude and Longitudes of two points
+ * Parameters are in Degrees (i.e. the coordinate system you get from GPS, Mapping WebSites, Phones, etc)
+ *
+ * L1 = Latitude of point A
+ * G1 = Longitude of point A
+ * L2 = Latitude of point B
+ * G2 = Longitude of point B
+ *
+ * d = acos (sin(L1)*sin(L2) + cos(L1)*cos(L2)*cos(G1 - G2))
+ *
+ * Returns answer in Degrees
+ *
+ * Since there are 60 degrees per nautical miles, you can convert to NM by multiplying by 60
+ *
+ * Essential formula from a Princeton website, the "Law of Cosines" method.
+ *
+ * Refactored cleaned up for speed Jonathan 3/8/2013
+ *
+ * @param latA
+ * @param lonA
+ * @param latB
+ * @param lonB
+ * @return
+ */
+ public static double calc(double latA, double lonA, double latB, double lonB) {
+ // Formula requires Radians. Expect Params to be Coordinates (Degrees)
+ // Simple ratio, quicker than calling Math.toRadians()
+ latA *= DEGREES_2_RADIANS;
+ lonA *= DEGREES_2_RADIANS;
+ latB *= DEGREES_2_RADIANS;
+ lonB *= DEGREES_2_RADIANS;
- return Math.acos(
- Math.sin(latA) * Math.sin(latB) +
- Math.cos(latA) * Math.cos(latB) * Math.cos(lonA-lonB)
- )
- / DEGREES_2_RADIANS;
- }
-
- /**
- * Convert from "Lat,Long Lat,Long" String format
- * "Lat,Long,Lat,Long" Format
- * or all four entries "Lat Long Lat Long"
- *
- * (Convenience function)
- *
- * Since Distance is positive, a "-1" indicates an error in String formatting
- */
- public static double calc(String ... coords) {
- try {
- String [] array;
- switch(coords.length) {
- case 1:
- array = Split.split(',',coords[0]);
- if(array.length!=4)return -1;
- return calc(
- Double.parseDouble(array[0]),
- Double.parseDouble(array[1]),
- Double.parseDouble(array[2]),
- Double.parseDouble(array[3])
- );
- case 2:
- array = Split.split(',',coords[0]);
- String [] array2 = Split.split(',',coords[1]);
- if(array.length!=2 || array2.length!=2)return -1;
- return calc(
- Double.parseDouble(array[0]),
- Double.parseDouble(array[1]),
- Double.parseDouble(array2[0]),
- Double.parseDouble(array2[1])
- );
- case 4:
- return calc(
- Double.parseDouble(coords[0]),
- Double.parseDouble(coords[1]),
- Double.parseDouble(coords[2]),
- Double.parseDouble(coords[3])
- );
-
- default:
- return -1;
- }
- } catch (NumberFormatException e) {
- return -1;
- }
- }
+ return Math.acos(
+ Math.sin(latA) * Math.sin(latB) +
+ Math.cos(latA) * Math.cos(latB) * Math.cos(lonA-lonB)
+ )
+ / DEGREES_2_RADIANS;
+ }
+
+ /**
+ * Convert from "Lat,Long Lat,Long" String format
+ * "Lat,Long,Lat,Long" Format
+ * or all four entries "Lat Long Lat Long"
+ *
+ * (Convenience function)
+ *
+ * Since Distance is positive, a "-1" indicates an error in String formatting
+ */
+ public static double calc(String ... coords) {
+ try {
+ String [] array;
+ switch(coords.length) {
+ case 1:
+ array = Split.split(',',coords[0]);
+ if(array.length!=4)return -1;
+ return calc(
+ Double.parseDouble(array[0]),
+ Double.parseDouble(array[1]),
+ Double.parseDouble(array[2]),
+ Double.parseDouble(array[3])
+ );
+ case 2:
+ array = Split.split(',',coords[0]);
+ String [] array2 = Split.split(',',coords[1]);
+ if(array.length!=2 || array2.length!=2)return -1;
+ return calc(
+ Double.parseDouble(array[0]),
+ Double.parseDouble(array[1]),
+ Double.parseDouble(array2[0]),
+ Double.parseDouble(array2[1])
+ );
+ case 4:
+ return calc(
+ Double.parseDouble(coords[0]),
+ Double.parseDouble(coords[1]),
+ Double.parseDouble(coords[2]),
+ Double.parseDouble(coords[3])
+ );
+
+ default:
+ return -1;
+ }
+ } catch (NumberFormatException e) {
+ return -1;
+ }
+ }
}
//* @return
//*/
//public static double calc3(double alat, double alon, double blat, double blon) {
-// alat *= DEGREES_2_RADIANS;
-// alon *= DEGREES_2_RADIANS;
-// blat *= DEGREES_2_RADIANS;
-// blon *= DEGREES_2_RADIANS;
-// return 2 * Math.asin(
-// Math.min(1, Math.sqrt(
-// Math.pow(Math.sin((blat-alat)/2), 2) +
-// (Math.cos(alat)*Math.cos(blat)*
-// Math.pow(
-// Math.sin((blon-alon)/2),2)
-// )
-// )
-// )
-// )
-// / DEGREES_2_RADIANS;
+// alat *= DEGREES_2_RADIANS;
+// alon *= DEGREES_2_RADIANS;
+// blat *= DEGREES_2_RADIANS;
+// blon *= DEGREES_2_RADIANS;
+// return 2 * Math.asin(
+// Math.min(1, Math.sqrt(
+// Math.pow(Math.sin((blat-alat)/2), 2) +
+// (Math.cos(alat)*Math.cos(blat)*
+// Math.pow(
+// Math.sin((blon-alon)/2),2)
+// )
+// )
+// )
+// )
+// / DEGREES_2_RADIANS;
//}
//
//This is a MEAN radius. The Earth is not perfectly spherical
-// public static final double EARTH_RADIUS_KM = 6371.0;
-// public static final double EARTH_RADIUS_NM = 3440.07;
-// public static final double KM_2_MILES_RATIO = 0.621371192;
+// public static final double EARTH_RADIUS_KM = 6371.0;
+// public static final double EARTH_RADIUS_NM = 3440.07;
+// public static final double KM_2_MILES_RATIO = 0.621371192;
///**
//* Code on Internet based on Unknown book. Lat/Long is in Degrees
//* @param alat
//* @return
//*/
//public static double calc1(double alat, double alon, double blat, double blon) {
-// alat *= DEGREES_2_RADIANS;
-// alon *= DEGREES_2_RADIANS;
-// blat *= DEGREES_2_RADIANS;
-// blon *= DEGREES_2_RADIANS;
-//
-// // Reused values
-// double cosAlat,cosBlat;
-//
-// return Math.acos(
-// ((cosAlat=Math.cos(alat))*Math.cos(alon)*(cosBlat=Math.cos(blat))*Math.cos(blon)) +
-// (cosAlat*Math.sin(alon)*cosBlat*Math.sin(blon)) +
-// (Math.sin(alat)*Math.sin(blat))
-// )/DEGREES_2_RADIANS;
-//
+// alat *= DEGREES_2_RADIANS;
+// alon *= DEGREES_2_RADIANS;
+// blat *= DEGREES_2_RADIANS;
+// blon *= DEGREES_2_RADIANS;
+//
+// // Reused values
+// double cosAlat,cosBlat;
+//
+// return Math.acos(
+// ((cosAlat=Math.cos(alat))*Math.cos(alon)*(cosBlat=Math.cos(blat))*Math.cos(blon)) +
+// (cosAlat*Math.sin(alon)*cosBlat*Math.sin(blon)) +
+// (Math.sin(alat)*Math.sin(blat))
+// )/DEGREES_2_RADIANS;
+//
//}
/*
Code Review / aaf / authz.git / blobdiff