上一个问题“使用 cartopy 检查地理坐标点是陆地还是海洋”的答案请参阅https://stackoverflow.com/questions/asktitle=Checking%20if%20a%20geocooperative%20point%20is%20land%20or%20ocean% 20using%20cartopy%20and%20Natural%20Earth%2010m%20data建议使用以下代码来确定地理坐标是否为“is_land”:
import cartopy.io.shapereader as shpreader
import shapely.geometry as sgeom
from shapely.ops import unary_union
from shapely.prepared import prep
land_shp_fname = shpreader.natural_earth(resolution='50m',
category='physical', name='land')
land_geom =
unary_union(list(shpreader.Reader(land_shp_fname).geometries()))
land = prep(land_geom)
def is_land(x, y):
return land.contains(sgeom.Point(x, y))
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当自然地球“物理”“土地”形状文件的分辨率更改为“10m”时,此代码返回地理坐标 (0,0) 的意外结果“True”。
>>> print(is_land(0, 0))
True
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这是 Natural Earth shapefile 数据或 shapely 实用程序代码的问题吗?
print shapely.__version__
1.6.4.post1
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