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我想合成一個海岸線的預測()地圖與shape文件,其.prj文件中說:如何將我的cartopy映射與shapefile的投影相匹配?
GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",
SPHEROID["WGS_1984",6378137.0,298.257223563]],
PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]
我的嘗試是:
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()
我試圖給地球我的platecarree定義中的參數是prj文件的半徑和逆平坦度,但是如果我設置或甚至改變這些數字,我沒有看到輸出的任何更改。
此外,在add_geometries調用中,使用定義的「platecarree」投影(以WGS84調用全球)作爲crs,我的輸出爲空白。
原樣,結果在我看來就像a projection mismatch