程序包 org.meteoinfo.data.mapdata.webmap

类 GeoUtil

java.lang.Object

org.meteoinfo.data.mapdata.webmap.GeoUtil

public final class GeoUtil
extends Object

These are math utilities for converting between pixels, tiles, and geographic coordinates. Implements a Google Maps style mercator projection.

作者:

joshy

构造器概要

构造器

构造器	说明
GeoUtil()

方法概要

修饰符和类型	方法	说明
static Point2D	getBitmapCoordinate(double latitude, double longitude, int zoomLevel, TileFactoryInfo info)	Given a position (latitude/longitude pair) and a zoom level, return the appropriate point in pixels.
static Point2D	getBitmapCoordinate(GeoPosition c, int zoomLevel, TileFactoryInfo info)	Given a position (latitude/longitude pair) and a zoom level, return the appropriate point in pixels.
static Dimension	getMapSize(int zoom, TileFactoryInfo info)
static GeoPosition	getPosition(Point2D pixelCoordinate, int zoom, TileFactoryInfo info)
static GeoPosition	getPositionForAddress(String[] fields)
static GeoPosition	getPositionForAddress(String street, String city, String state)	Convert a street address into a position.
static double	getResolution(int zoomLevel, double lat)	Get resolution
static double	getScale(int zoomLevel, double lat)	Get scale
static boolean	isValidTile(int x, int y, int zoomLevel, TileFactoryInfo info)

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

GeoUtil

public GeoUtil()

方法详细资料

getMapSize

public static Dimension getMapSize(int zoom,
                                   TileFactoryInfo info)

参数:

zoom - Zoom

info - Tile factory info

返回:

the size of the map at the given zoom, in tiles (num tiles tall by num tiles wide)

isValidTile

public static boolean isValidTile(int x,
                                  int y,
                                  int zoomLevel,
                                  TileFactoryInfo info)

参数:

x - X

y - Y

zoomLevel - Zoom level

info - Tile factory info

返回:

true if this point in tiles is valid at this zoom level. For example, if the zoom level is 0 (zoomed all the way out, where there is only one tile), then x,y must be 0,0

getBitmapCoordinate

public static Point2D getBitmapCoordinate(GeoPosition c,
                                          int zoomLevel,
                                          TileFactoryInfo info)

Given a position (latitude/longitude pair) and a zoom level, return the appropriate point in pixels. The zoom level is necessary because pixel coordinates are in terms of the zoom level

参数:

c - A lat/lon pair

zoomLevel - the zoom level to extract the pixel coordinate for

info - Tile factory info

返回:

Bitmap coordinate point

getBitmapCoordinate

public static Point2D getBitmapCoordinate(double latitude,
                                          double longitude,
                                          int zoomLevel,
                                          TileFactoryInfo info)

Given a position (latitude/longitude pair) and a zoom level, return the appropriate point in pixels. The zoom level is necessary because pixel coordinates are in terms of the zoom level

参数:

latitude - Latitude

longitude - Longitude

zoomLevel - the zoom level to extract the pixel coordinate for

info - Tile factory info

返回:

Position point

getPosition

public static GeoPosition getPosition(Point2D pixelCoordinate,
                                      int zoom,
                                      TileFactoryInfo info)

getPositionForAddress

public static GeoPosition getPositionForAddress(String[] fields)
                                         throws IOException

抛出:

IOException

getPositionForAddress

public static GeoPosition getPositionForAddress(String street,
                                                String city,
                                                String state)
                                         throws IOException

Convert a street address into a position. Uses the Yahoo GeoCoder. You must supply your own yahoo id.

参数:

street - Street

city - City

state - State (must be a US state)

返回:

the position of this street address

抛出:

IOException - if the request fails.

getResolution

public static double getResolution(int zoomLevel,
                                   double lat)

Get resolution

参数:

zoomLevel - The zoom level

lat - The latitude

返回:

Resolution

getScale

public static double getScale(int zoomLevel,
                              double lat)

Get scale

参数:

zoomLevel - The zoom level

lat - The latitude

返回:

Scale