程序包 org.meteoinfo.geometry.geoprocess

类 GeoComputation

java.lang.Object

org.meteoinfo.geometry.geoprocess.GeoComputation

public class GeoComputation
extends Object

GeoComputation class

作者:

Yaqiang Wang

构造器概要

构造器

构造器	说明
GeoComputation()

方法概要

修饰符和类型	方法	说明
static double	calArea(List<PointD> points)	Get polygon area on earth surface
static PointShape	clipPointShape(PointShape aPS, Object clipObj)	Clip point shape with a clipping object
static List<Polygon>	clipPolygon(Polygon inPolygon, Object clipObj)
static PolygonShape	clipPolygonShape(PolygonShape aPGS, Object clipObj)	Clip polygon shape with a clipping object
static PolygonShape	clipPolygonShape_Lat(PolygonShape aPGS, double lat)	Clip polygon shape with a latitude
static PolygonShape	clipPolygonShape_Lat(PolygonShape aPGS, double lat, boolean isTop)	Clip polygon shape with a latitude
static PolygonShape	clipPolygonShape_Lon(PolygonShape aPGS, double lon)	Clip polygon shape with a longitude
static PolylineShape	clipPolylineShape(PolylineShape aPLS, Object clipObj)	Clip polyline shape with a clipping object
static PolylineShape	clipPolylineShape_Lat(PolylineShape aPLS, double lat)	Clip polyline shape with a longitude
static PolylineShape	clipPolylineShape_Lat(PolylineShape aPLS, double lat, boolean isTop)	Clip polyline shape with a longitude
static PolylineShape	clipPolylineShape_Lon(PolylineShape aPLS, double lon)	Clip polyline shape with a longitude
static Shape	clipShape(Shape aShape, Object clipObj)	Clip a shape
static double	crossProduct(PointD p1, PointD p2, PointD p3)	Finds the cross product of the 2 vectors created by the 3 vertices.
static double	dis_PointToLine(PointD point, PointD pt1, PointD pt2)	Calculate the distance between point and a line segment
static double	distance(PointD pt1, PointD pt2)	Get distance between two points
static double	getArea(double[] x, double[] y, boolean isLonLat)	Get polygon area on earth surface
static double	getArea(double[] x, double[] y, boolean isLonLat, double earthRadius)	Get polygon area on earth surface
static double	getArea(List<? extends PointD> points)	Get polygon area on earth surface
static double	getArea(List<? extends PointD> points, boolean isLonLat)	Get polygon area on earth surface
static double	getArea(List<Number> x, List<Number> y, boolean isLonLat)	Get polygon area
protected static List<PointD>	getClipPointList(Object clipObj)
protected static List<PointD>	getClipPointList(Object clipObj, boolean z)
protected static PointD	getCrossPoint(Line lineA, Line lineB)
static double	getDistance(List<? extends PointD> points, boolean isLonLat)	Get distance
static double	getDistance(List<Number> xx, List<Number> yy, boolean isLonLat)	Get distance
static Array	getGridArea(double xOrig, double xCell, int xNum, double yOrig, double yCell, int yNum, boolean isLonLat, boolean allCell)	Calculate area of grid cells.
static Array	getGridArea(double xOrig, double xCell, int xNum, double yOrig, double yCell, int yNum, boolean isLonLat, boolean allCell, double earthRadius)	Calculate area of grid cells.
static List<GridLabel>	getGridLabels(Polyline inPolyLine, Extent clipExtent, boolean isVertical)	Get grid labels of a polyline
static double	haversine(double x)	Haversine function : hav(x) = (1-cos(x))/2
static Array	interpolation_Surface(Array x_s, Array y_s, Array a, Array X, Array Y)	Interpolate with surface method
static boolean	isClockwise(List<? extends PointD> pointList)	Determine if a point array is clockwise
static boolean	isClockwise(PointD[] points)	Determine if a point array is clockwise
protected static boolean	isExtentCross(Extent aExtent, Object clipObj)
protected static boolean	isLineSegmentCross(Line lineA, Line lineB)
protected static boolean	pointInClipObj(Object clipObj, PointD aPoint)
static boolean	pointInPolygon(List<? extends PointD> poly, PointD aPoint)	Determine if a point is in a polygon
static boolean	pointInPolygon(Polygon aPolygon, PointD aPoint)	Determine if a point is in a polygon
static boolean	pointInPolygon(PolygonShape aPolygon, double x, double y)	Determine if a point is in a polygon
static boolean	pointInPolygon(PolygonShape aPolygon, PointD aPoint)	Determine if a point is in a polygon
static boolean	pointInPolygons(List<PolygonShape> polygons, PointD aPoint)	Determine if a point located in polygons
static double	pointProduct(PointD p1, PointD p2, PointD p3)	Finds the point product of the 2 vectors created by the 3 vertices.
static int	polygonIndex(List<PolygonShape> polygons, PointD point)	Get polygon index from polygons by a point
static Object	selectPolyline(PointD sp, List<PointD> points, double buffer)	Select polyline shape by a point
static Object	selectPolylineShape(PointD sp, PolylineShape aPLS, double buffer)	Select polyline shape by a point
static double	sphericalPolygonArea(double[] lat, double[] lon, double r)	Compute the Area of a Spherical Polygon
static double	sphericalPolygonArea(List<? extends PointD> points)	Compute the Area of a Spherical Polygon
static double	sphericalPolygonArea(List<? extends PointD> points, double r)	Compute the Area of a Spherical Polygon

从类继承的方法 java.lang.Object

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

构造器详细资料

GeoComputation

public GeoComputation()

方法详细资料

isClockwise

public static boolean isClockwise(List<? extends PointD> pointList)

Determine if a point array is clockwise

参数:

pointList - point list

返回:

boolean

isClockwise

public static boolean isClockwise(PointD[] points)

Determine if a point array is clockwise

参数:

points - point array

返回:

boolean

pointInPolygon

public static boolean pointInPolygon(List<? extends PointD> poly,
                                     PointD aPoint)

Determine if a point is in a polygon

参数:

poly - Polygon border points

aPoint - The point

返回:

If the point is in the polygon

pointInPolygon

public static boolean pointInPolygon(PolygonShape aPolygon,
                                     PointD aPoint)

Determine if a point is in a polygon

参数:

aPolygon - The polygon

aPoint - The point

返回:

Boolean

pointInPolygon

public static boolean pointInPolygon(PolygonShape aPolygon,
                                     double x,
                                     double y)

Determine if a point is in a polygon

参数:

aPolygon - The polygon

x - X

y - Y

返回:

Boolean

pointInPolygon

public static boolean pointInPolygon(Polygon aPolygon,
                                     PointD aPoint)

Determine if a point is in a polygon

参数:

aPolygon - The polygon

aPoint - The point

返回:

Boolean

pointInPolygons

public static boolean pointInPolygons(List<PolygonShape> polygons,
                                      PointD aPoint)

Determine if a point located in polygons

参数:

polygons - The polygons

aPoint - The point

返回:

Boolean

polygonIndex

public static int polygonIndex(List<PolygonShape> polygons,
                               PointD point)

Get polygon index from polygons by a point

参数:

polygons - The polygons

point - The point

返回:

Polygon index - the point is inside the polygon

dis_PointToLine

public static double dis_PointToLine(PointD point,
                                     PointD pt1,
                                     PointD pt2)

Calculate the distance between point and a line segment

参数:

point - The point

pt1 - End point of the line segment

pt2 - End point of the line segment

返回:

Distance

distance

public static double distance(PointD pt1,
                              PointD pt2)

Get distance between two points

参数:

pt1 - Point one

pt2 - Point two

返回:

Distance

selectPolylineShape

public static Object selectPolylineShape(PointD sp,
                                         PolylineShape aPLS,
                                         double buffer)

Select polyline shape by a point

参数:

sp - The point

aPLS - The polyline shape

buffer - Buffer

返回:

Is the polyline shape selected

selectPolyline

public static Object selectPolyline(PointD sp,
                                    List<PointD> points,
                                    double buffer)

Select polyline shape by a point

参数:

sp - The point

points - The point list

buffer - Buffer

返回:

Is the polyline shape selected

getGridArea

public static Array getGridArea(double xOrig,
                                double xCell,
                                int xNum,
                                double yOrig,
                                double yCell,
                                int yNum,
                                boolean isLonLat,
                                boolean allCell)

Calculate area of grid cells.

参数:

xOrig - X origin

xCell - X cell spacing

xNum - X number

yOrig - Y origin

yCell - Y cell spacing

yNum - Y number

isLonLat - Is lonlat projection or not

allCell - Calculate each grid or not

返回:

Grid area array

getGridArea

public static Array getGridArea(double xOrig,
                                double xCell,
                                int xNum,
                                double yOrig,
                                double yCell,
                                int yNum,
                                boolean isLonLat,
                                boolean allCell,
                                double earthRadius)

Calculate area of grid cells.

参数:

xOrig - X origin

xCell - X cell spacing

xNum - X number

yOrig - Y origin

yCell - Y cell spacing

yNum - Y number

isLonLat - Is lonlat projection or not

allCell - Calculate each grid or not

earthRadius - Earth radius

返回:

Grid area array

getArea

public static double getArea(List<Number> x,
                             List<Number> y,
                             boolean isLonLat)

Get polygon area

参数:

x - X coordinates

y - Y coordinates

isLonLat - If is on earth surface (lon/lat)

返回:

Area

getArea

public static double getArea(double[] x,
                             double[] y,
                             boolean isLonLat)

Get polygon area on earth surface

参数:

x - X coordinates

y - Y coordinates

isLonLat - if is lon/lat

返回:

area

getArea

public static double getArea(double[] x,
                             double[] y,
                             boolean isLonLat,
                             double earthRadius)

Get polygon area on earth surface

参数:

x - X coordinates

y - Y coordinates

isLonLat - if is lon/lat

earthRadius - Earth radius

返回:

area

getArea

public static double getArea(List<? extends PointD> points,
                             boolean isLonLat)

Get polygon area on earth surface

参数:

points - point list

isLonLat - if is lon/lat

返回:

area

getArea

public static double getArea(List<? extends PointD> points)

Get polygon area on earth surface

参数:

points - point list

返回:

area

calArea

public static double calArea(List<PointD> points)

Get polygon area on earth surface

参数:

points - point list

返回:

area

sphericalPolygonArea

public static double sphericalPolygonArea(List<? extends PointD> points)

Compute the Area of a Spherical Polygon

参数:

points - lon/lat point list

返回:

area

sphericalPolygonArea

public static double sphericalPolygonArea(List<? extends PointD> points,
                                          double r)

Compute the Area of a Spherical Polygon

参数:

points - lon/lat point list

r - spherical radius

返回:

area

haversine

public static double haversine(double x)

Haversine function : hav(x) = (1-cos(x))/2

参数:

x -

返回:

Returns the value of Haversine function

sphericalPolygonArea

public static double sphericalPolygonArea(double[] lat,
                                          double[] lon,
                                          double r)

Compute the Area of a Spherical Polygon

参数:

lat - the latitudes of all vertices(in radian)

lon - the longitudes of all vertices(in radian)

r - spherical radius

返回:

Returns the area of a spherical polygon

getDistance

public static double getDistance(List<? extends PointD> points,
                                 boolean isLonLat)

Get distance

参数:

points - Point list

isLonLat - If is lon/lat

返回:

Distance

getDistance

public static double getDistance(List<Number> xx,
                                 List<Number> yy,
                                 boolean isLonLat)

Get distance

参数:

xx - X coordinates

yy - Y coordinates

isLonLat - If is lon/lat

返回:

Distance

getGridLabels

public static List<GridLabel> getGridLabels(Polyline inPolyLine,
                                            Extent clipExtent,
                                            boolean isVertical)

Get grid labels of a polyline

参数:

inPolyLine - Polyline

clipExtent - Clipping object

isVertical - If is vertical

返回:

Clip points

clipShape

public static Shape clipShape(Shape aShape,
                              Object clipObj)

Clip a shape

参数:

aShape - The shape

clipObj - Clipping object

返回:

Clipped shape

clipPointShape

public static PointShape clipPointShape(PointShape aPS,
                                        Object clipObj)

Clip point shape with a clipping object

参数:

aPS - The point shape

clipObj - Clipping object

返回:

Clipped point shape

clipPolylineShape

public static PolylineShape clipPolylineShape(PolylineShape aPLS,
                                              Object clipObj)

Clip polyline shape with a clipping object

参数:

aPLS - The polyline shape

clipObj - Clipping object

返回:

Clipped polyline shape

clipPolylineShape_Lon

public static PolylineShape clipPolylineShape_Lon(PolylineShape aPLS,
                                                  double lon)

Clip polyline shape with a longitude

参数:

aPLS - Polyline shape

lon - Longitude

返回:

Clipped polyline shape

clipPolylineShape_Lat

public static PolylineShape clipPolylineShape_Lat(PolylineShape aPLS,
                                                  double lat)

Clip polyline shape with a longitude

参数:

aPLS - Polyline shape

lat - The latitude

返回:

Clipped polyline shape

clipPolylineShape_Lat

public static PolylineShape clipPolylineShape_Lat(PolylineShape aPLS,
                                                  double lat,
                                                  boolean isTop)

Clip polyline shape with a longitude

参数:

aPLS - Polyline shape

lat - Latitude

isTop - If is top

返回:

Clipped polyline shape

clipPolygonShape

public static PolygonShape clipPolygonShape(PolygonShape aPGS,
                                            Object clipObj)

Clip polygon shape with a clipping object

参数:

aPGS - Polygon shape

clipObj - Clipping object

返回:

Clipped polygon shape

clipPolygonShape_Lon

public static PolygonShape clipPolygonShape_Lon(PolygonShape aPGS,
                                                double lon)

Clip polygon shape with a longitude

参数:

aPGS - Polygon shape

lon - Longitude

返回:

Clipped polygon shape

clipPolygonShape_Lat

public static PolygonShape clipPolygonShape_Lat(PolygonShape aPGS,
                                                double lat)

Clip polygon shape with a latitude

参数:

aPGS - Polygon shape

lat - Latitude

返回:

Clipped polygon shape

clipPolygonShape_Lat

public static PolygonShape clipPolygonShape_Lat(PolygonShape aPGS,
                                                double lat,
                                                boolean isTop)

Clip polygon shape with a latitude

参数:

aPGS - Polygon shape

lat - Latitude

isTop - If is top

返回:

Clipped polygon shape

clipPolygon

public static List<Polygon> clipPolygon(Polygon inPolygon,
                                        Object clipObj)

isExtentCross

protected static boolean isExtentCross(Extent aExtent,
                                       Object clipObj)

pointInClipObj

protected static boolean pointInClipObj(Object clipObj,
                                        PointD aPoint)

getClipPointList

protected static List<PointD> getClipPointList(Object clipObj)

getClipPointList

protected static List<PointD> getClipPointList(Object clipObj,
                                               boolean z)

isLineSegmentCross

protected static boolean isLineSegmentCross(Line lineA,
                                            Line lineB)

crossProduct

public static double crossProduct(PointD p1,
                                  PointD p2,
                                  PointD p3)

Finds the cross product of the 2 vectors created by the 3 vertices. if the sign of the cross product is negative. The vectors make a "left turn" if the sign of the cross product is positive. The vectors are colinear (on the same line) if the cross product is zero.

参数:

p1 - Point 1

p2 - Point 2

p3 - Piont 3

返回:

Cross product of the two vectors

pointProduct

public static double pointProduct(PointD p1,
                                  PointD p2,
                                  PointD p3)

Finds the point product of the 2 vectors created by the 3 vertices.

参数:

p1 - Point 1

p2 - Point 2

p3 - Piont 3

返回:

Cross product of the two vectors

getCrossPoint

protected static PointD getCrossPoint(Line lineA,
                                      Line lineB)

interpolation_Surface

public static Array interpolation_Surface(Array x_s,
                                          Array y_s,
                                          Array a,
                                          Array X,
                                          Array Y)

Interpolate with surface method

参数:

x_s - scatter X array

y_s - scatter Y array

a - scatter value array

X - x coordinate

Y - y coordinate

返回:

grid data