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我不知道如何使用以下代碼。無論出於何種原因,GeoPandas * .plot()都不起作用,但我想對一些簡單的情節使用Pandas和GeoPandas。與Shapely Polygons的映射
我一直在嘗試從GeoPandas中取出Shapely對象並將它們繪製在底圖上。問題是多邊形不會繪圖。我從GeoPandas.geometry遍歷它們,將它們添加到軸集合,然後使用plot() - 無濟於事。底圖似乎工作正常,代碼不會給出任何錯誤,但多邊形 - 縣 - 不會出現...
謝謝你的幫助!
import geopandas as gpd
from descartes import PolygonPatch
import matplotlib as mpl
import mpl_toolkits.basemap as base
import matplotlib.pyplot as plt
counties_file = r'C:\Users\...\UScounties\UScounties.shp'
counties = gpd.read_file(counties_file)
#new plot
fig = plt.figure(figsize=(5,5),dpi=300)
#ax = fig.add_subplot(111)
ax = ax = plt.gca()
minx, miny, maxx, maxy = counties.total_bounds
#map
m = base.Basemap(llcrnrlon=minx, llcrnrlat=miny,
urcrnrlon=maxx, urcrnrlat=maxy,
resolution='h', area_thresh=100000,
projection='merc')
patches = []
#add polygons
for poly in counties.geometry:
#deal with single polygons and multipolygons
if poly.geom_type == 'Polygon':
p = PolygonPatch(poly, facecolor='blue', alpha=1)
#plt.gca().add_patch(p)
#ax.add_patch(p)
patches.append(p)
elif poly.geom_type == 'MultiPolygon':
for single in poly:
q = PolygonPatch(single,facecolor='red', alpha=1)
#ax.add_patch(p)
patches.append(q)
m.drawcoastlines(linewidth=.1)
m.fillcontinents()
m.drawcountries(linewidth=.25,linestyle='solid')
m.drawstates(linewidth=.25,linestyle='dotted')
m.drawmapboundary(fill_color='white')
ax.add_collection(mpl.collections.PatchCollection(patches, match_original=True))
ax.plot()
plt.show()
怎麼了?詳細說明你的問題。 –
什麼不與GeoPandas'plot()'方法一起使用?它尚未處理地圖投影,但它應該在數據的座標系中顯示一個圖。 – Kelsey