如何在地理 hvplot 点图上叠加文本标签？

Question

我正在尝试向在平铺地图上显示点的 hvplot 添加标签。

我的 GeoDataFrame gdf 看起来像这样：

  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, 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

添加 x 和 y 选项会显式产生不同的错误：

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

我能够通过将 CRS 转换为 EPSG:3857 (WGS 84 / Pseudo-Mercator) 来实现它，这可能适合也可能不适合您的目的。

附带说明一下，如果能MRE回答这样的问题就好了。

这是有效的方法：

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)

这真的只是解决了原来的问题，可能值得在 github 上报告这个问题。

如何在地理 hvplot 点图上叠加文本标签？

How can I overlay text labels on a geographic hvplot points plot?

python

geopandas

hvplot