如何使用python在ESRI shapefile中以特定纬度/经度查找信息？

Question

我有一个ESRI shapefile(来自这里:http://pubs.usgs.gov/ds/425/).我希望使用python以给定的纬度/经度从形状文件(在这种情况下为表面材料)中查找信息.

解决这个问题的最佳方法是什么？

谢谢.

最终解决方案

#!/usr/bin/python

from osgeo import ogr, osr

dataset = ogr.Open('./USGS_DS_425_SHAPES/Surficial_materials.shp')
layer = dataset.GetLayerByIndex(0)
layer.ResetReading()

# Location for New Orleans: 29.98 N, -90.25 E
point = ogr.CreateGeometryFromWkt("POINT(-90.25 29.98)")

# Transform the point into the specified coordinate system from WGS84
spatialRef = osr.SpatialReference()
spatialRef.ImportFromEPSG(4326)
coordTransform = osr.CoordinateTransformation(
        spatialRef, layer.GetSpatialRef())

point.Transform(coordTransform)

for feature in layer:
    if feature.GetGeometryRef().Contains(point):
        break

for i in range(feature.GetFieldCount()):
    print feature.GetField(i)

Answer 1

您可以使用gdal/ogr工具包的 python 绑定。这是一个例子：

from osgeo import ogr

ds = ogr.Open("somelayer.shp")
lyr = ds.GetLayerByName("somelayer")
lyr.ResetReading()

point = ogr.CreateGeometryFromWkt("POINT(4 5)")

for feat in lyr:
    geom = feat.GetGeometryRef()
    if geom.Contains(point):
        sm = feat.GetField(feat.GetFieldIndex("surface_material"))
        # do stuff...