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Lat/Long将其转换为XY输出。然而,结果对我来说是不正确的。我不明白输出单位/比例。我本来想要六位数的。
剧本:
"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("\ew0001\NavigationsCMP")
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发布于 2016-03-18 00:19:35
GDAL <3的原始答案
你需要交换轴的顺序,这样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更新GDAL 3+的答案
轴排序已经从GDAL3.0改变了(例如,请参阅GDAL的OSR教程)。默认顺序是“符合权限的”,.e.g。Lat/Long要获得X/Y使用的“传统轴序”:
source.SetAxisMappingStrategy(osr.OAMS_TRADITIONAL_GIS_ORDER)
target.SetAxisMappingStrategy(osr.OAMS_TRADITIONAL_GIS_ORDER)如果您想为source保留Lat/Long,它将是默认的或指定的:
source.SetAxisMappingStrategy(osr.OAMS_AUTHORITY_COMPLIANT)请注意,EPSG:2193具有默认权限Northing/EPSG(或Y/X)。
https://stackoverflow.com/questions/35945437
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