Python (GDAL):从 WGS84 到 NZTM2000 的投影转换不正确

Question

我是Python和GDAL的新手。我正在将以下文件转换为NZTM2000坐标转换器。我将文件导入为 csv，然后使用纬度/经度将其转换为 XY 输出。但是，结果对我来说是不正确的。我不明白输出单位/比例。我期待 6 位数的东西。

脚本：

"reads a CSV file and converts its coordinates"
import os
import csv
from osgeo import gdal
from osgeo import osr
from osgeo import ogr
# Coordinate Reference System (CRS)
SourceEPSG = 4326  
TargetEPSG = 2193
source = osr.SpatialReference()
source.ImportFromEPSG(SourceEPSG)
target = osr.SpatialReference()
target.ImportFromEPSG(TargetEPSG)

# Input file details
fullpath = os.path.abspath("ew0001NavigationsCMP")
def CRSTransform(Lat, Long):
    transform = osr.CoordinateTransformation(source, target)
    point = ogr.CreateGeometryFromWkt("POINT ("+Lat+" "+Long+")")
    point.Transform(transform)
    print point.GetX(), "   ", point.GetY()

print "Reading CSV"
inCSV = csv.DictReader(open(fullpath+".csv"))
for row in inCSV:
    lat = row['Lat']
    long = row['Long']
    CRSTransform(lat, long)

输入：

Lat Long    CMP Year    Month   Day Hours   Mins    Sec XXX Line    Vintage
-44.419134  172.243651  264 2000    1   23  6   11  10  180 10  EW0001
-44.419176  172.243706  265 2000    1   23  6   11  12  681 10  EW0001
-44.419214  172.243759  266 2000    1   23  6   11  15  181 10  EW0001
-44.419259  172.24382   267 2000    1   23  6   11  17  711 10  EW0001

输出：

-44.419134     172.243651
-44.419176     172.243706
-44.419214     172.243759
-44.419259     172.24382

Answer 1

GDAL <3 的原始答案

您需要交换轴顺序，以便 X = 经度，Y = 纬度。

def CRSTransform(Lat, Long):
    transform = osr.CoordinateTransformation(source, target)
    point = ogr.Geometry(ogr.wkbPoint)
    point.SetPoint_2D(0, float(Long), float(Lat))
    point.Transform(transform)
    print point.GetX(), "   ", point.GetY()
CRSTransform(-44.419134, 172.243651)  # 1539788.868     5081294.99354

GDAL 3+ 更新的答案

轴排序已从 GDAL 3.0 更改（例如，请参阅 GDAL 的 OSR API 教程）。默认顺序是"符合权威"，例如纬度/经度。要获取 X/Y 的"传统轴顺序"，请使用：

source.SetAxisMappingStrategy(osr.OAMS_TRADITIONAL_GIS_ORDER)
target.SetAxisMappingStrategy(osr.OAMS_TRADITIONAL_GIS_ORDER)

如果你想保留 经度/经度 source ，它将是默认值或指定：

source.SetAxisMappingStrategy(osr.OAMS_AUTHORITY_COMPLIANT)

请注意，EPSG：2193 具有默认权限"北向/向东"（或 Y/X）。