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Calculating distance between point and MultiPolygon Geoseries object in Python

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1

I want to calculate the distance of a point from the Multiploygon geoseries object created using cascaded_union function of GeoPandas. Following is my code:

import numpy as np

import pandas as pd

import geopandas as gpd

from shapely.ops import cascaded_union

from matplotlib import pyplot as plt

from shapely.geometry import LineString, Point, MultiPoint



fp = "\TM_WORLD_BORDERS-0.3\TM_WORLD_BORDERS-0.3.shp"

data = gpd.read_file(fp)



mycountries = ['Canada','Russia']



req_data = data[data.NAME.isin(mycountries)]

req_data = req_data.reset_index()

req_data = req_data.drop('index',axis=1)



polygons = [req_data['geometry'][0],req_data['geometry'][1]]

boundary = gpd.GeoSeries(cascaded_union(polygons))

boundary.plot(color = 'black')

plt.show()

I require that when I calculate the distance of two points (as shown on the map: red dots) from the MultiPolygon, it should consider Canada for the one in the left side and Russia for the right one. Also, the distance in miles/km.

I tried using distance function but the result which I am getting is not correct. Moreover, if I consider point somewhere in the Indian Ocean, it gives a result as 0 which is again not what I require.

Shapefile can be downloaded from the TM_WORLD_BORDERS-0.3.zip file available at http://thematicmapping.org/downloads/world_borders.php

python polygon distance shapely geopandas

share|improve this question

edited 50 secs ago

Taras

2,2342727

asked 3 hours ago

ansmalansmal

61

New contributor

ansmal is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

1

I want to calculate the distance of a point from the Multiploygon geoseries object created using cascaded_union function of GeoPandas. Following is my code:

import numpy as np

import pandas as pd

import geopandas as gpd

from shapely.ops import cascaded_union

from matplotlib import pyplot as plt

from shapely.geometry import LineString, Point, MultiPoint



fp = "\TM_WORLD_BORDERS-0.3\TM_WORLD_BORDERS-0.3.shp"

data = gpd.read_file(fp)



mycountries = ['Canada','Russia']



req_data = data[data.NAME.isin(mycountries)]

req_data = req_data.reset_index()

req_data = req_data.drop('index',axis=1)



polygons = [req_data['geometry'][0],req_data['geometry'][1]]

boundary = gpd.GeoSeries(cascaded_union(polygons))

boundary.plot(color = 'black')

plt.show()

I require that when I calculate the distance of two points (as shown on the map: red dots) from the MultiPolygon, it should consider Canada for the one in the left side and Russia for the right one. Also, the distance in miles/km.

I tried using distance function but the result which I am getting is not correct. Moreover, if I consider point somewhere in the Indian Ocean, it gives a result as 0 which is again not what I require.

Shapefile can be downloaded from the TM_WORLD_BORDERS-0.3.zip file available at http://thematicmapping.org/downloads/world_borders.php

python polygon distance shapely geopandas

share|improve this question

edited 50 secs ago

Taras

2,2342727

asked 3 hours ago

ansmalansmal

61

New contributor

ansmal is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

I want to calculate the distance of a point from the Multiploygon geoseries object created using cascaded_union function of GeoPandas. Following is my code:

import numpy as np

import pandas as pd

import geopandas as gpd

from shapely.ops import cascaded_union

from matplotlib import pyplot as plt

from shapely.geometry import LineString, Point, MultiPoint



fp = "\TM_WORLD_BORDERS-0.3\TM_WORLD_BORDERS-0.3.shp"

data = gpd.read_file(fp)



mycountries = ['Canada','Russia']



req_data = data[data.NAME.isin(mycountries)]

req_data = req_data.reset_index()

req_data = req_data.drop('index',axis=1)



polygons = [req_data['geometry'][0],req_data['geometry'][1]]

boundary = gpd.GeoSeries(cascaded_union(polygons))

boundary.plot(color = 'black')

plt.show()

I require that when I calculate the distance of two points (as shown on the map: red dots) from the MultiPolygon, it should consider Canada for the one in the left side and Russia for the right one. Also, the distance in miles/km.

I tried using distance function but the result which I am getting is not correct. Moreover, if I consider point somewhere in the Indian Ocean, it gives a result as 0 which is again not what I require.

Shapefile can be downloaded from the TM_WORLD_BORDERS-0.3.zip file available at http://thematicmapping.org/downloads/world_borders.php

python polygon distance shapely geopandas

share|improve this question

edited 50 secs ago

Taras

2,2342727

asked 3 hours ago

ansmalansmal

61

New contributor

ansmal is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

import numpy as np

import pandas as pd

import geopandas as gpd

from shapely.ops import cascaded_union

from matplotlib import pyplot as plt

from shapely.geometry import LineString, Point, MultiPoint



fp = "\TM_WORLD_BORDERS-0.3\TM_WORLD_BORDERS-0.3.shp"

data = gpd.read_file(fp)



mycountries = ['Canada','Russia']



req_data = data[data.NAME.isin(mycountries)]

req_data = req_data.reset_index()

req_data = req_data.drop('index',axis=1)



polygons = [req_data['geometry'][0],req_data['geometry'][1]]

boundary = gpd.GeoSeries(cascaded_union(polygons))

boundary.plot(color = 'black')

plt.show()

share|improve this question

edited 50 secs ago

Taras

2,2342727

asked 3 hours ago

ansmalansmal

61

New contributor

ansmal is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 50 secs ago

Taras

2,2342727

asked 3 hours ago

ansmalansmal

61

New contributor

ansmal is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 50 secs ago

Taras

2,2342727

edited 50 secs ago

Taras

2,2342727

asked 3 hours ago

ansmalansmal

61

New contributor

ansmal is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 3 hours ago

ansmalansmal

61