python Geopanda

Posted 2021-05-09

import pandas as pd
import geopandas as gpd
import shapely
from shapely import wkb

df = pd.read_csv(r"../filename.csv")
df['geometry']  = df['geometry'].apply(lambda x: wkb.loads(x, hex=True))
df = gpd.GeoDataFrame(df).set_geometry('geometry')

#convert datatframe with point infomation to geometry point 
import pandas as pd
import geopandas as gpd
import shapely

df = pd.read_csv(r"../filename.csv")
geompoint = [shapely.geometry.Point(xy) for xy in zip(df.lng,df.lat)]
geom = gpd.GeoDataFrame(df, geometry=geompoint)

#another method
def point_to_geo(df,lon,lat):
    df['geometry'] = gpd.GeoSeries(list(zip(df[lon],df[lat]))).apply(Point) #识别经纬度，转换点数据
    df = gpd.GeoDataFrame(df) #转换Geodataframe格式
    df.crs = {'init':'epsg:4326'} #定义坐标系WGS84
    del df[lon]
    del df[lat]
    return df

import pandas as pd
import geopadnas as gpd
from shapely.ops import nearest_points
from shapely.geometry import Point
from shapely.ops import unary_union

view_point = Point(x,y)
multipoints = somedf.geometry.unary_union
#for geoSeries
#multipoints = gpd.GeoSeries(somedf).unary_union

queired_geom,nearest_geom = nearest_points(view_point,multipoints)