无法从 geojson 列创建 geopandas 几何图形

Question

我有一个 csv，其中包含一个有效的 geojson 对象几何表示形式的字段。我能够将它作为 json 字典加载，然后我在 geopandas set_geometry 中设置它而没有错误。虽然一切都正确执行，但我无法弄清楚为什么我的几何图形是空的。这是 csv：

代码如下：

    from shapely.geometry import shape
df =pd.read_csv('c:/random_polygon.csv')
def parse_geom(geom_str):
    try:
        return shape(json.loads(geom_str))
    except (TypeError, AttributeError): 
        return None

["geometry"] = df["geo_properties"].apply(parse_geom)
df = df[df.geo_properties != None]
gdf = gpd.GeoDataFrame(df, geometry="geometry")
gdf = gdf.set_crs('epsg:4326')
print(gdf.head())

这是地理位置json:

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              -89.77632522583008,
              34.07143110146331
            ],
            [
              -89.78070259094238,
              34.05422388685686
            ],
            [
              -89.76662635803223,
              34.04825031787262
            ],
            [
              -89.74491119384766,
              34.04917482631512
            ],
            [
              -89.74748611450195,
              34.0705068357665
            ],
            [
              -89.75503921508789,
              34.08095756019248
            ],
            [
              -89.77726936340332,
              34.0810286491402
            ],
            [
              -89.78233337402344,
              34.08053102525307
            ],
            [
              -89.77632522583008,
              34.07143110146331
            ]
          ]
        ]
      }
    }
  ]
}

Answer 1

您的 DataFrame geo_properties 列中的每个单元格似乎都包含一个完整的 GeoJSON 字符串。这不起作用，因为 Features and FeatureCollections are not supported by shapely.

尝试用 geopandas 解析每个单元格并提取 GeometryArray：

In [18]: df.geo_properties.apply(
    ...:     lambda x: gpd.read_file(x, driver="GeoJSON").geometry.values
    ...: )
    ...:
Out[18]:
0    [POLYGON ((-89.77632522583008 34.0714311014633...
Name: geo_properties, dtype: object

无法从 geojson 列创建 geopandas 几何图形

Unable to create geopandas geometry from geojson column

python

gis

dataframe

pandas

geopandas