| java.lang.Object
 org.cougaar.tools.csmart.util.EarthConstants
| EarthConstants | | final public class EarthConstants (Code) | | Interface containing constants for doing math on the Earth:
Computing distances between points largely
Constants here taken from
OpenMap
Files: com.bbn.openmap.proj.ProjMath, com.bbn.openmap.proj.MoreMath
com.bbn.openmap.proj.GreatCircle and com.bbn.openmap.proj.Planet
Those files in turn rely in part on John Snyder's
Map Projection --A Working Manual
Some routines taken from Cougaar
and the class org.cougaar.glm.util.GeoUtils
|
| Method Summary | |
| public static float | DistanceBetweenLatLonPoints(LatLonPoint position1, LatLonPoint position2)
| | public static float | DistanceBetweenPoints(float latitude1, float longitude1, float latitude2, float longitude2)
Compute great-circle distance in KM between two points on globe
expressed as latitude and longitude. | | final public static boolean | approximately_equal(double a, double b, double epsilon)
Checks if a ~= b. | | final public static boolean | approximately_equal(float a, float b, float epsilon)
Checks if a ~= b. | | final public static float | arcRadius(float meters)
Convert the meters distance into arcRadius on the earth.
Parameters:
meters - distance, should be <= the Earth's Circumference. | | final public static double | degToRad(double deg)
Convert degrees to radians. | | final public static float | degToRad(float deg)
Convert degrees to radians. | | final public static int | hashLatLon(float lat, float lon)
Generate a hashCode value for a lat/lon pair. | | final public static double | radToDeg(double rad)
Convert radians to degrees. | | final public static float | radToDeg(float rad)
Convert radians to degrees. | | final public static LatLonPoint | spherical_between(float phi1, float lambda0, float c, float Az)
Calculate point at azimuth and distance from another point. | | final public static LatLonPoint | spherical_between(LatLonPoint point, float c, float Az)
Calculate point at azimuth and distance from another point. | | final public static LatLonPoint | spherical_between_degs(float lat, float lon, float c, float Az)
Calculate point at azimuth and distance from another point. | | final public static float | spherical_distance(float phi1, float lambda0, float phi, float lambda)
Calculate spherical arc distance between two points.
Computes arc distance `c' on the sphere. | | final public static float | spherical_distance(LatLonPoint p1, LatLonPoint p2)
Calculate spherical arc distance between two points.
Computes arc distance `c' on the sphere. | | final public static float | spherical_distance_deg(float lat1, float lon1, float lat2, float lon2)
Calculate spherical arc distance between two points.
Computes arc distance `c' on the sphere. |
| TWO_PI | | final public static float TWO_PI(Code) | | |
| equatorialCircumferenceMeters | | final public static transient float equatorialCircumferenceMeters(Code) | | |
| equatorialRadiusMeters | | final public static transient float equatorialRadiusMeters(Code) | | |
| polarRadiusMeters | | final public static transient float polarRadiusMeters(Code) | | |
| DistanceBetweenLatLonPoints | | public static float DistanceBetweenLatLonPoints(LatLonPoint position1, LatLonPoint position2)(Code) | | Compute great-circle distance (expressed as float Kilometers)
between two points on globe (expressed as LatLonPoint)
Parameters:
position1 - LatLonPoint of first point
Parameters:
position2 - LatLonPoint of second point double distance in KM of great-circle distance between points |
| DistanceBetweenPoints | | public static float DistanceBetweenPoints(float latitude1, float longitude1, float latitude2, float longitude2)(Code) | | Compute great-circle distance in KM between two points on globe
expressed as latitude and longitude.
Parameters:
latitude1 - float latitude of first point (decimal degrees)
Parameters:
longitude1 - float longitude of first point (decimal degrees)
Parameters:
latitude2 - float latitude of second point (decimal degrees)
Parameters:
longitude2 - float longitude of second point (decimal degrees) float great-circle distance between two points in KM |
| approximately_equal | | final public static boolean approximately_equal(double a, double b, double epsilon)(Code) | | Checks if a ~= b.
Use this to test equality of floating point numbers.
Parameters:
a - double
Parameters:
b - double
Parameters:
epsilon - the allowable error boolean |
| approximately_equal | | final public static boolean approximately_equal(float a, float b, float epsilon)(Code) | | Checks if a ~= b.
Use this to test equality of floating point numbers.
Parameters:
a - float
Parameters:
b - float
Parameters:
epsilon - the allowable error boolean |
| arcRadius | | final public static float arcRadius(float meters)(Code) | | Convert the meters distance into arcRadius on the earth.
Parameters:
meters - distance, should be <= the Earth's Circumference. float radians arc radius (0 < ret <= PI) |
| degToRad | | final public static double degToRad(double deg)(Code) | | Convert degrees to radians.
Parameters:
deg - degrees double radians |
| degToRad | | final public static float degToRad(float deg)(Code) | | Convert degrees to radians.
Parameters:
deg - degrees float radians |
| hashLatLon | | final public static int hashLatLon(float lat, float lon)(Code) | | Generate a hashCode value for a lat/lon pair.
Parameters:
lat - latitude
Parameters:
lon - longitude int hashcode |
| radToDeg | | final public static double radToDeg(double rad)(Code) | | Convert radians to degrees.
Parameters:
rad - radians double decimal degrees |
| radToDeg | | final public static float radToDeg(float rad)(Code) | | Convert radians to degrees.
Parameters:
rad - radians float decimal degrees |
| spherical_between | | final public static LatLonPoint spherical_between(float phi1, float lambda0, float c, float Az)(Code) | | Calculate point at azimuth and distance from another point.
Returns a LatLonPoint at arc distance `c' in direction `Az'
from start point.
Parameters:
phi1 - latitude in radians of start point
Parameters:
lambda0 - longitude in radians of start point
Parameters:
c - arc radius in radians (0 < c <= PI)
Parameters:
Az - azimuth (direction) east of north (-PI <= Az < PI) LatLonPoint |
| spherical_between | | final public static LatLonPoint spherical_between(LatLonPoint point, float c, float Az)(Code) | | Calculate point at azimuth and distance from another point.
Returns a LatLonPoint at arc distance `c' in direction `Az'
from start point.
Parameters:
point - LatLonPoint of start
Parameters:
c - arc radius in radians (0 < c <= PI)
Parameters:
Az - azimuth (direction) east of north (-PI <= Az < PI) in radians LatLonPoint |
| spherical_between_degs | | final public static LatLonPoint spherical_between_degs(float lat, float lon, float c, float Az)(Code) | | Calculate point at azimuth and distance from another point.
Returns a LatLonPoint at arc distance `c' in direction `Az'
from start point.
Parameters:
lat - latitude in degrees of start point
Parameters:
lon - longitude in degrees of start point
Parameters:
c - arc radius in radians (0 < c <= PI)
Parameters:
Az - azimuth (direction) east of north (-PI <= Az < PI) LatLonPoint |
| spherical_distance | | final public static float spherical_distance(float phi1, float lambda0, float phi, float lambda)(Code) | | Calculate spherical arc distance between two points.
Computes arc distance `c' on the sphere. equation
(5-3a). (0 <= c <= PI)
Parameters:
phi1 - latitude in radians of start point
Parameters:
lambda0 - longitude in radians of start point
Parameters:
phi - latitude in radians of end point
Parameters:
lambda - longitude in radians of end point float arc distance `c' in radians |
| spherical_distance | | final public static float spherical_distance(LatLonPoint p1, LatLonPoint p2)(Code) | | Calculate spherical arc distance between two points.
Computes arc distance `c' on the sphere. equation
(5-3a). (0 <= c <= PI)
Parameters:
p1 - LatLonPoint of first point
Parameters:
p2 - LatLonPoint of second point float arc distance `c' in radians |
| spherical_distance_deg | | final public static float spherical_distance_deg(float lat1, float lon1, float lat2, float lon2)(Code) | | Calculate spherical arc distance between two points.
Computes arc distance `c' on the sphere. equation
(5-3a). (0 <= c <= PI)
Parameters:
lat1 - latitude in degrees of start point
Parameters:
lon1 - longitude in degrees of start point
Parameters:
lat2 - latitude in degrees of end point
Parameters:
lon2 - longitude in degrees of end point float arc distance `c' in radians |
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