如何在地理 hvplot 點 plot 上疊加文本標簽？

Question

我正在嘗試將標簽添加到顯示平鋪 map 上的點的 hvplot 中。

我的 GeoDataFrame gdf看起來像這樣：

  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)

將這些點添加到 map 很容易：

gdf.hvplot(geo=True, tiles=True)

然后我嘗試以類似的方式對 plot 文本標簽使用標簽，但這不起作用。：

gdf.hvplot.labels(geo=True, tiles=True, text='id')

它給了我這個錯誤

Traceback (most recent call last):

  File "<ipython-input-138-73570b6a686e>", line 1, in <module>
    centroid_labels = dfl.hvplot.labels(geo=True, tiles=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, y, 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, y)

  File "C:\Users\user\Miniconda3\envs\otp\lib\site-packages\hvplot\converter.py", 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

顯式添加x和y選項會產生不同的錯誤：

gdf.hvplot.labels(geo=True, tiles=True, x=gdf.geometry.x, y=gdf.geometry.y, text='id')

Traceback (most recent call last):

  File "<ipython-input-143-0eaefd24cbe6>", line 1, in <module>
    centroid_labels = dfl.hvplot.labels(geo=True, x=dfl.geometry.x, y=dfl.geometry.y, tiles=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, y, kind, **kwds)(kind, x, 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().

Answer 1

我能夠通過將 CRS 轉換為EPSG:3857 ( WGS 84 / Pseudo-Mercator ) 來實現這一點，這可能適合也可能不適合您的目的。

附帶說明一下，如果有一個關於此類問題的MRE ，那就太好了。

這是有效的：

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)

我認為這應該有效：

gdf.hvplot.labels(text="labels", geo=True)

這真的只是解決原始問題，可能值得在 github 上報告該問題。