CODEWITHSUNDEEP
pythonarcgisshapesgeopandasshapely
VGB
VGB

Reputation: 497

How to Make a Polygon/shapefile which corresponds to the outer boundary of the given points?

i have a dataframe which contains X and Y cordinates of the points

df=

80.4    30  17.11755
80.1    30  17.11755
80.7    30  17.11755
80.7    30.3    17.11755
80.4    30.3    17.11755
80.1    30.3    17.11755
81.3    30  17.11755
81  30  17.11755
81  30.3    17.11755
81.3    30.3    17.11755
81.6    30  17.11755
81.6    30.3    17.11755
81.9    30.3    17.11755
81.9    30  17.11755
82.2    29.7    17.11755
81  29.7    17.11755
81.3    29.7    17.11755
81.6    29.7    17.11755
81.9    29.7    17.11755
82.2    30  17.11755
82.2    30.3    17.11755
80.7    29.7    17.11755
80.4    29.7    17.11755
80.1    29.7    17.11755

which can be represented like given below enter image description here

How to make a shapefile/polygon which corresponds to the rectangle in the picture(ie, outer boundary of the cluster of points) if such points are given?

NB: points do make random shapes

Any help?

Upvotes: 1

Views: 1400

Answers (2)

user1321988
user1321988

Reputation: 523

To add to the correct answer above:

import geopandas as gpd
from shapely.geometry import MultiPoint, Polygon

pts = [[80.4,    30,  17.11755],
 [80.1,    30,  17.11755],
[80.7,    29.7,  17.11755]]

mp = MultiPoint(pts)

conv_hull = mp.convex_hull

poly = Polygon(conv_hull)

df = gpd.GeoDataFrame({'geometry': gpd.GeoSeries(poly)})
df.crs = {'init': 'epsg:4326'} #Or whatever crs you want
df.to_file('poly.shp')

Upvotes: 3

Joran Beasley
Joran Beasley

Reputation: 113988

you can use the shapely library for this

from __future__ import print_function # py2
from shapely.geometry import MultiPoint

if __name__=="__main__":
    pts = MultiPoint([(16,3), (12,17), (0,6), (-4,-6), (16,6), (16,-7), (16,-3), (17,-4), (5,19), (19,-8), (3,16), (12,13), (3,-4), (17,5), (-3,15), (-3,-9), (0,11), (-9,-3), (-4,-2), (12,10)])
    print (pts.convex_hull)

(I just stole this from https://rosettacode.org/wiki/Convex_hull#Python )

Upvotes: 3

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