我正在尝试将 Coastlines() 地图的投影与 shapefile 的投影合成,其 .prj 文件显示:
GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",
SPHEROID["WGS_1984",6378137.0,298.257223563]],
PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]
我的尝试是:
import matplotlib.pyplot as plt
import cartopy.crs as ccrs
from cartopy.io import shapereader
# set up a map with coastlines around Auckland:
plt.figure(figsize=(10, 10))
platecarree = ccrs.PlateCarree(globe=ccrs.Globe(datum='WGS84'))
ax = plt.axes(projection=platecarree)
extent = [174.25, 175.25, -37.5, -36.5]
ax.set_extent(extent)
ax.coastlines('10m',color='red')
# read in shapefile and plot the polygons:
shp2 = shapereader.Reader('auckland_geology_wgs84gcs.shp')
formations = shp2.records()
for formation in formations:
# plot water blue, and all other rocks yellow
if formation.attributes['MAIN_ROCK'] == b' ':
ax.add_geometries(formation.geometry, ccrs.PlateCarree(),facecolor='blue',alpha=.1)
else:
ax.add_geometries(formation.geometry, ccrs.PlateCarree(), facecolor='yellow',alpha=.1)
plt.show()
我尝试在我的 platecarree 定义中为地球参数提供半径和 prj 文件的反向展平,但如果我设置甚至更改这些数字,我没有看到输出有任何变化。
此外,使用定义的“platecarree”投影(使用 WGS84 调用地球)作为 add_geometries 调用中的 crs,我的输出为空白。
照原样,结果在我看来就像投影不匹配