问题描述
我的 GeoDataFrame gdf
如下所示:
id geometry
8911 POINT (5.79557 53.20121)
8912 POINT (5.76973 53.18031)
8913 POINT (5.78159 53.20088)
8914 POINT (5.75442 53.20394)
8915 POINT (5.76594 53.21173)
将这些点添加到地图很容易:
gdf.hvplot(geo=True,tiles=True)
然后我尝试使用 labels 以类似的方式绘制文本标签,但这不起作用。:
gdf.hvplot.labels(geo=True,tiles=True,text='id')
它给了我这个错误
Traceback (most recent call last):
File "<ipython-input-138-73570b6a686e>",line 1,in <module>
centroid_labels = dfl.hvplot.labels(geo=True,text='id')
File "C:\Users\user\Miniconda3\envs\otp\lib\site-packages\hvplot\plotting\core.py",line 574,in labels
return self(x,y,text=text,kind='labels',**kwds)
File "C:\Users\user\Miniconda3\envs\otp\lib\site-packages\hvplot\plotting\core.py",line 79,in __call__
return self._get_converter(x,kind,**kwds)(kind,x,y)
File "C:\Users\user\Miniconda3\envs\otp\lib\site-packages\hvplot\converter.py",line 1097,in __call__
obj = method(x,line 1688,in labels
text = self.kwds.get('text',[c for c in data.columns if c not in (x,y)][0])
IndexError: list index out of range
gdf.hvplot.labels(geo=True,x=gdf.geometry.x,y=gdf.geometry.y,text='id')
Traceback (most recent call last):
File "<ipython-input-143-0eaefd24cbe6>",x=dfl.geometry.x,y=dfl.geometry.y,y)
File "C:\Users\user\Miniconda3\envs\otp\lib\site-packages\hvplot\plotting\core.py",line 83,in _get_converter
x = x or params.pop('x',None)
File "C:\Users\user\Miniconda3\envs\otp\lib\site-packages\pandas\core\generic.py",line 1442,in __nonzero__
raise ValueError(
ValueError: The truth value of a Series is ambiguous. Use a.empty,a.bool(),a.item(),a.any() or a.all().
解决方法
我能够通过将 CRS 转换为 EPSG:3857 (WGS 84 / Pseudo-Mercator) 来使其工作,这可能适合也可能不适合您的目的。
顺便说一句,对于这样的问题,MRE 会很好。
这是有效的:
import geopandas as gpd
import pandas as pd
import hvplot.pandas
import geoviews as gv
from geoviews import tile_sources as gvts
raw = """8911 POINT (5.79557 53.20121)
8912 POINT (5.76973 53.18031)
8913 POINT (5.78159 53.20088)
8914 POINT (5.75442 53.20394)
8915 POINT (5.76594 53.21173)"""
data = [(_[0],_[-2],_[-1]) for _ in [_.replace("(","").replace(")","").split() for _ in raw.split("\n")]]
df = pd.DataFrame(data,columns=["labels","x","y"]).astype({"labels": str})
gdf = gpd.GeoDataFrame(df,geometry=gpd.points_from_xy(df.x,df.y,crs="EPSG:4326"))
tiles = gvts.CartoLight
points = gdf.hvplot(geo=True,tiles="CartoLight")
labels = gdf.to_crs("EPSG:3857").assign(x=lambda df: df.geometry.x,y=lambda df: df.geometry.y).hvplot.labels(text="labels",x="x",y="y")
(points * labels * tiles).opts(height=600,width=800)
我认为这应该有效:
gdf.hvplot.labels(text="labels",geo=True)
这实际上只是解决了原始问题,可能值得在 github 上报告该问题。