我下载了波士顿的shapefile,并希望使用下面的代码将其绘制出来。但是,这给了我一个错误ValueError: lat_0 must be between -90.000000 and 90.000000 degrees

原来coords的值是(33869.92130000144, 777617.2998000011, 330800.31099999696, 959741.1853)为什么这么大?

Boston shapefile is obtained here



# Import Boston shapefile
shapefilename = 'ZIPCODES_NT_POLY'
shp = fiona.open(shapefilename + '.shp')
coords = shp.bounds
shp.close()

w, h = coords[2] - coords[0], coords[3] - coords[1]
extra = 0.01

m = Basemap(
    projection='tmerc', ellps='WGS84',
    lon_0 = np.mean([coords[0], coords[2]]),
    lat_0 = np.mean([coords[1], coords[3]]),
    llcrnrlon = coords[0] - extra * w,
    llcrnrlat = coords[1] - extra * h,
    urcrnrlon = coords[2] + extra * w,
    urcrnrlat = coords[3] + extra * h,
    resolution = 'i', suppress_ticks = True)


错误

ValueError: lat_0 must be between -90.000000 and 90.000000 degrees

最佳答案

您需要从Eastings和Northings的原始投影重新投影到另一个坐标参考系统。如果需要纬度和经度,通常为WGS84EPSG:4326。重新投影的方法如下:

import fiona
import pyproj
from functools import partial
from shapely.geometry import box
from shapely.ops import transform

shp = fiona.open('ZIPCODES_NT_POLY.shp', 'r')
p_in = pyproj.Proj(shp.crs)
bound_box = box(*shp.bounds)
shp.close()

p_out = pyproj.Proj({'init': 'EPSG:4326'})  # aka WGS84
project = partial(pyproj.transform, p_in, p_out)

bound_box_wgs84 = transform(project, bound_box)

print('native box: ' + str(bound_box))
print('WGS84 box: ' + str(bound_box_wgs84))



  本机框:POLYGON((330800.310999997 777617.2998000011,330800.310999997 959741.1853,33869.92130000144 959741.1853,33869.92130000144 777617.2998000011,330800.310999997 777617.2998000011)
  
  WGS84盒:POLYGON((--69.93980848410942 41.23787282321487,-69.899038698261 42.87724537285449,-73.53324195423785 42.8704709990465,-73.48147096070339 41.2312695091688,-69.93980848410942 41.23787282321487))


否则,底图所需的大多数参数都在shp.crs中(看看)。

10-07 11:58