打开街道地图(pyproj).如何解决语法问题? [英] Open Street Map (pyproj). How to solve syntax issue?

问题描述

使用pyproj可视化开放的街道地图并出现以下错误:

Using pyproj for visualizing open street map and getting the following error:

> AppData\Local\Programs\Python\Python36-32\lib\site-packages\pyproj\crs.py:77:
> FutureWarning: '+init=<authority>:<code>' syntax is deprecated.
> '<authority>:<code>' is the preferred initialization method.   return
> _prepare_from_string(" ".join(pjargs))

程序运行，但会弹出空白地图.

The program runs but spits out a map that is blank.

我在Google上找不到很多东西.这是什么以及如何解决?

There's not much I could find on google. What is this and how to fix it?

请参见下面的代码段

##Create map
crs = {'init': 'epsg:4326'}
new_df = gpd.GeoDataFrame(new_df, crs=crs)

#Contextly
new_df = new_df.to_crs(epsg=3857) 

##Plot
variable = 'All' #set a variable that will call column
fig, ax = plt.subplots(1, figsize=(50, 50)) #create figure and axes for Matplotlib
ox = new_df.plot(column=variable, cmap='viridis', linewidth=0.3, ax=ax, edgecolor='0.8',alpha=0.5,scheme='equal_interval',k=10,legend=True,legend_kwds={'loc': 'lower left'})

##ADD BASEMAP
ctx.add_basemap(ox,zoom=15)

#Remove the axis
ox.set_axis_off()

##Save Map
plt.savefig('Latest_Map.png')
##Show Map
plt.show()

推荐答案

关于语法问题，当您重新投影时，警告来自pyproj.Geopandas已更改其文档以反映这一点(请参见 https://github.com/geopandas/geopandas/pull/1101/files#diff-dc9328ce726fd6e58f466f7001f7a50e 和 https://github.com/geopandas/geopandas/blob/31b264fabb88367a63823da107c764ccec4d3e8f/doc/source/projections.rst )和建议:

Concerning the syntax issue, the warning comes from pyproj, when you reproject. Geopandas has changed its docs to reflect that (see https://github.com/geopandas/geopandas/pull/1101/files#diff-dc9328ce726fd6e58f466f7001f7a50e and https://github.com/geopandas/geopandas/blob/31b264fabb88367a63823da107c764ccec4d3e8f/doc/source/projections.rst) and advices:

• 手动设置

my_geoseries.crs ="EPSG:4326"

my_geoseries.crs = "EPSG:4326"

• 重新投影

world = world.to_crs("EPSG:3395")#world.to_crs(epsg = 3395)也会起作用

world = world.to_crs("EPSG:3395") # world.to_crs(epsg=3395) would also work

注意: world.to_crs(epsg = 3395)确实可以工作，但是仍然会发出警告(由于 fiona的 from_espg 函数.crs 在内部被调用，但仍使用 {'init':... ).如果您不希望出现警告，则:

Note: the world.to_crs(epsg=3395) will indeed work, but it will still issue a warning (because of the from_espg function of fiona.crs that gets called internally and still uses the {'init':...). If you want no warnings:

new_df = gpd.GeoDataFrame(new_df)
new_df.crs = "EPSG:4326"    # set it by hand

new_df = new_df.to_crs("EPSG:3857")

但是，这不应该，并且可能不是地图空白的原因.不知道您的实际 new_df 很难说，但是尝试使用Geopandas数据集( naturalearth_lowres )的df尝试您的代码，似乎可以正常工作.缩放，建议您在不使用 zoom = 15 参数的情况下调用 ctx.add_basemap (默认值为 zoom =自动" )，然后查看.

However, this should not be, and probably is not the reason why your map is blank. Without knowing your actual new_df is hard to tell, but trying your code with a df from geopandas datasets(naturalearth_lowres) it seems to work fine.. having had some issues with the zoom, i'd suggest that you call the ctx.add_basemap without the zoom=15 argument (the default is zoom="auto") and see.

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