GeoTools:从 LAT/LNG 转换为 Albers
GeoTools: Converting from LAT/LNG to Albers
我需要将 GPS 坐标(纬度和经度)转换为阿尔伯斯等面积投影。有人可以帮助我使用 GeoTools Java 库进行这种转换吗?
我找不到任何示例或文档来帮助我执行此操作。我正在尝试做类似的事情:
// set a global hint to force GeoTools to use x/y order (longitute first)
System.setProperty("org.geotools.referencing.forceXY", "true");
double lat = 43.96499314;
double lng = 2.33656753;
// FACTORIES
Hints hints = new Hints(Hints.CRS, DefaultGeographicCRS.WGS84);
PositionFactory positionFactory = GeometryFactoryFinder.getPositionFactory(hints);
GeometryFactory geometryFactory = GeometryFactoryFinder.getGeometryFactory(hints);
PrimitiveFactory primitiveFactory = GeometryFactoryFinder.getPrimitiveFactory(hints);
AggregateFactory aggregateFactory = GeometryFactoryFinder.getAggregateFactory(hints);
// POINTS
WKTParser parser = new WKTParser(geometryFactory, primitiveFactory, positionFactory, aggregateFactory);
Point point = (Point) parser.parse("POINT(" + lng + " " + lat + ")");
CRSAuthorityFactory factory = CRS.getAuthorityFactory(true);
CoordinateReferenceSystem latLngCRS = DefaultGeographicCRS.WGS84;
CoordinateReferenceSystem albersCRS = factory.createCoordinateReferenceSystem("EPSG:3005");
MathTransform transform = CRS.findMathTransform(latLngCRS, albersCRS, false);
DirectPosition latLngDirectPosition = point.getDirectPosition();
DirectPosition albersDirectPosition = transform.transform(latLngDirectPosition, null);
System.out.println("latLngDirectPosition: " + Arrays.toString(latLngDirectPosition.getCoordinate()));
System.out.println("albersDirectPosition: " + Arrays.toString(albersDirectPosition.getCoordinate()));
我得到了转换,但不知道它是否正确。
得到的值为:
Lng/Lat [-124.453125, 54.140625] => 阿尔伯斯 [1100811.6154403698, 1016407.2018336256]
谁能帮帮我?
谢谢!
看看:http://docs.geotools.org/latest/userguide/library/referencing/crs.html
在"Finding a Math Transform"节中,有一个涉及Albers_Conic_Equal_Area投影的例子。
您可以使用外部工具的另一个输出来检查您的计算是否正确。这是您可以通过移动地图在线使用的一个:
http://spatialreference.org/ref/epsg/nad83-bc-albers/
我需要将 GPS 坐标(纬度和经度)转换为阿尔伯斯等面积投影。有人可以帮助我使用 GeoTools Java 库进行这种转换吗?
我找不到任何示例或文档来帮助我执行此操作。我正在尝试做类似的事情:
// set a global hint to force GeoTools to use x/y order (longitute first)
System.setProperty("org.geotools.referencing.forceXY", "true");
double lat = 43.96499314;
double lng = 2.33656753;
// FACTORIES
Hints hints = new Hints(Hints.CRS, DefaultGeographicCRS.WGS84);
PositionFactory positionFactory = GeometryFactoryFinder.getPositionFactory(hints);
GeometryFactory geometryFactory = GeometryFactoryFinder.getGeometryFactory(hints);
PrimitiveFactory primitiveFactory = GeometryFactoryFinder.getPrimitiveFactory(hints);
AggregateFactory aggregateFactory = GeometryFactoryFinder.getAggregateFactory(hints);
// POINTS
WKTParser parser = new WKTParser(geometryFactory, primitiveFactory, positionFactory, aggregateFactory);
Point point = (Point) parser.parse("POINT(" + lng + " " + lat + ")");
CRSAuthorityFactory factory = CRS.getAuthorityFactory(true);
CoordinateReferenceSystem latLngCRS = DefaultGeographicCRS.WGS84;
CoordinateReferenceSystem albersCRS = factory.createCoordinateReferenceSystem("EPSG:3005");
MathTransform transform = CRS.findMathTransform(latLngCRS, albersCRS, false);
DirectPosition latLngDirectPosition = point.getDirectPosition();
DirectPosition albersDirectPosition = transform.transform(latLngDirectPosition, null);
System.out.println("latLngDirectPosition: " + Arrays.toString(latLngDirectPosition.getCoordinate()));
System.out.println("albersDirectPosition: " + Arrays.toString(albersDirectPosition.getCoordinate()));
我得到了转换,但不知道它是否正确。
得到的值为: Lng/Lat [-124.453125, 54.140625] => 阿尔伯斯 [1100811.6154403698, 1016407.2018336256]
谁能帮帮我? 谢谢!
看看:http://docs.geotools.org/latest/userguide/library/referencing/crs.html
在"Finding a Math Transform"节中,有一个涉及Albers_Conic_Equal_Area投影的例子。
您可以使用外部工具的另一个输出来检查您的计算是否正确。这是您可以通过移动地图在线使用的一个: http://spatialreference.org/ref/epsg/nad83-bc-albers/