org.h2gis.functions.spatial.topography

Class ST_TriangleAspect

java.lang.Object

org.h2gis.api.AbstractFunction

org.h2gis.api.DeterministicScalarFunction

org.h2gis.functions.spatial.topography.ST_TriangleAspect

All Implemented Interfaces:

org.h2gis.api.Function, org.h2gis.api.ScalarFunction

public class ST_TriangleAspect
extends org.h2gis.api.DeterministicScalarFunction

This function is used to compute the aspect of a triangle. Aspect represents the main slope direction angle compared to the north direction.

Author:

Erwan Bocher

Field Summary

Fields inherited from interface org.h2gis.api.ScalarFunction

PROP_DETERMINISTIC, PROP_NOBUFFER

Fields inherited from interface org.h2gis.api.Function

PROP_NAME, PROP_REMARKS

Constructor Summary

Constructors

Constructor and Description
ST_TriangleAspect()

Method Summary

Modifier and Type	Method and Description
static Double	computeAspect(org.locationtech.jts.geom.Geometry geometry) Compute the aspect in degree.
String	getJavaStaticMethod()
static double	measureFromNorth(double angle) Transforms an angle measured in degrees counterclockwise from the x-axis (mathematicians) to an angle measured in degrees clockwise from the y-axis (geographers).

Methods inherited from class org.h2gis.api.AbstractFunction

addProperty, getProperty, removeProperty

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.h2gis.api.Function

getProperty

Constructor Detail

ST_TriangleAspect

public ST_TriangleAspect()

Method Detail

getJavaStaticMethod

public String getJavaStaticMethod()

computeAspect

public static Double computeAspect(org.locationtech.jts.geom.Geometry geometry)
                            throws IllegalArgumentException

Compute the aspect in degree. The geometry must be a triangle.

Parameters:

geometry - Polygon triangle

Returns:

aspect in degree

Throws:

IllegalArgumentException - ST_TriangleAspect accept only triangles

measureFromNorth

public static double measureFromNorth(double angle)

Transforms an angle measured in degrees counterclockwise from the x-axis (mathematicians) to an angle measured in degrees clockwise from the y-axis (geographers).

Parameters:

angle - Mathematician's angle

Returns:

Geographer's angle