我需要将GPS坐标(纬度和经度)转换为Albers等面积投影。有人可以帮我使用GeoTools Java Library进行转换吗?
我找不到任何帮助我这样做的示例或文档。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()));
我得到了改造,但不知道它是否正确。
获得的值是: Lng / Lat [-124.453125,54.140625] => Albers [1100811.6154403698,1016407.2018336256]
任何人都可以帮助我吗? 谢谢!
答案 0 :(得分:1)
查看:http://docs.geotools.org/latest/userguide/library/referencing/crs.html
在"查找数学变换"部分中,有一个涉及Albers_Conic_Equal_Area投影的示例。
您可以使用外部工具的其他输出来检查您的计算是否正确。您可以通过移动地图在线使用以下内容: http://spatialreference.org/ref/epsg/nad83-bc-albers/