GeoTools 从以米为单位的 CRS 转换为以度为单位的 CRS (WGS84)

Question

我正在尝试使用 GeoTools 在两个坐标系之间进行转换，一个以米为单位，另一个以度为单位，但无论我尝试什么，转换后的值都不正确。我尝试使用相同的代码来遵循其他示例，但由于某种原因，它无法在这两个坐标系之间进行转换：[EPSG:3044] -> [EPSG:4326] (WGS 84)

我正在为两个 CRS 解析 WKT，然后使用 GeoTools 对其进行转换 - 下面是我当前的代码以及我的结果：

编辑源代码已更新以反映使用 WKT 和内部 CRS 解码器的输出。

val sourceCRS = CRS.parseWKT(
  """PROJCS["ETRS89 / UTM zone 32N (N-E)",
    |    GEOGCS["ETRS89",
    |        DATUM["European_Terrestrial_Reference_System_1989",
    |            SPHEROID["GRS 1980",6378137,298.257222101,
    |                AUTHORITY["EPSG","7019"]],
    |            TOWGS84[0,0,0,0,0,0,0],
    |            AUTHORITY["EPSG","6258"]],
    |        PRIMEM["Greenwich",0,
    |            AUTHORITY["EPSG","8901"]],
    |        UNIT["degree",0.0174532925199433,
    |            AUTHORITY["EPSG","9122"]],
    |        AUTHORITY["EPSG","4258"]],
    |    PROJECTION["Transverse_Mercator"],
    |    PARAMETER["latitude_of_origin",0],
    |    PARAMETER["central_meridian",9],
    |    PARAMETER["scale_factor",0.9996],
    |    PARAMETER["false_easting",500000],
    |    PARAMETER["false_northing",0],
    |    UNIT["metre",1,
    |        AUTHORITY["EPSG","9001"]],
    |    AUTHORITY["EPSG","3044"]]""".stripMargin)

val targetCRS = CRS.parseWKT(
  """
    |GEOGCS["WGS 84",
    |    DATUM["WGS_1984",
    |        SPHEROID["WGS 84",6378137,298.257223563,
    |            AUTHORITY["EPSG","7030"]],
    |        AUTHORITY["EPSG","6326"]],
    |    PRIMEM["Greenwich",0,
    |        AUTHORITY["EPSG","8901"]],
    |    UNIT["degree",0.0174532925199433,
    |        AUTHORITY["EPSG","9122"]],
    |    AUTHORITY["EPSG","4326"]]
    |""".stripMargin)

val source = CRS.decode("EPSG:3044");
val target = CRS.decode("EPSG:4326");

val originalCoordinate = new Coordinate(5293975.04, 959436.64)
// WKT
val coordinateWKT = new Coordinate()
val wktTransform = CRS.findMathTransform(sourceCRS, targetCRS, true)
JTS.transform(originalCoordinate, coordinateWKT, wktTransform)
// EPSG
val coordinateEPSG = new Coordinate()
val epsgTransform = CRS.findMathTransform(source, target, true);
JTS.transform(originalCoordinate, coordinateEPSG, epsgTransform);
// Output
System.out.println(s"Original: ${originalCoordinate}")
System.out.println(s"EKT: ${coordinateWKT}")
System.out.println(s"EPSG: ${coordinateEPSG}")

而我的输入输出坐标是：

Original: (5293975.04, 959436.64, NaN)
EKT: (48.79550725975144, 6.678848738740256, NaN)
EPSG: (47.63578358581114, 15.117187455070956, NaN)

Answer 1

因此正确的变换坐标为：(56.4336819°, 4.1353377°)

可能你的源坐标不准确，因为它不在使用坐标系的区域。

来自epsg.io：

Area of use: Europe between 6°E and 12°E: Austria; Belgium; Denmark - onshore and offshore; Germany - onshore and offshore; Norway including - onshore and offshore; Spain - offshore

您的坐标在非洲东部，在印度洋。

如果我使用来自奥地利的坐标，我会得到以下输出（在 Java 中）：

CoordinateReferenceSystem source = CRS.decode("EPSG:25832"); 
CoordinateReferenceSystem target = CRS.decode("EPSG:4326");
Coordinate coordinate = new Coordinate(959436.64, 5293975.04);
// when you are using EPSG:3044, you have to change x and y: 
// Coordinate coordinate = new Coordinate(5293975.04, 959436.64);
MathTransform transform = CRS.findMathTransform(source, target, false);
JTS.transform(coordinate, coordinate, transform);

System.out.println(coordinate);  //(47.63578358581114, 15.117187455070956, NaN)

这与 epsg.io 的结果相同。请注意，我使用的是 EPSG:25832 而不是 EPSG:3044。

GeoTools 从以米为单位的 CRS 转换为以度为单位的 CRS (WGS84)

GeoTools transform from CRS in meters to CRS in degree (WGS84)

java

scala

geotools

wkt

epsg