How to create a shapely Polygon from a list of shapely Points?

python polygon shapely
Sounak picture Sounak · May 26, 2015 · Viewed 60.3k times · Source

I want to create a polygon from shapely points.

from shapely import geometry
p1 = geometry.Point(0,0)
p2 = geometry.Point(1,0)
p3 = geometry.Point(1,1)
p4 = geometry.Point(0,1)

pointList = [p1, p2, p3, p4, p1]

poly = geometry.Polygon(pointList)

gives me an type error TypeError: object of type 'Point' has no len()

How to create a Polygon from shapely Point objects?

Answer

songololo picture songololo · May 26, 2015

If you specifically want to construct your Polygon from the shapely geometry Points, then call their x, y properties in a list comprehension. In other words:

from shapely import geometry

poly = geometry.Polygon([[p.x, p.y] for p in pointList])

print(poly.wkt)  # prints: 'POLYGON ((0 0, 1 0, 1 1, 0 1, 0 0))'

Note that shapely is clever enough to close the polygon on your behalf, i.e. you don't necessarily have to pass-in the first point again at the end.

Related questions

Extract points/coordinates from a polygon in Shapely

How do you get/extract the points that define a shapely polygon? Thanks! Example of a shapely polygon from shapely.geometry import Polygon # Create polygon from lists of points x = [list of x vals] y = [list of y vals] polygon = …

Read More
Check if geo-point is inside or outside of polygon

I am using python and I have defined the latitudes and longitudes (in degrees) of a polygon on the map. My goal is to check if a generic point P of coordinates x,y falls within such polygon. I would …

Read More
Calculate overlapped area between two rectangles

I want to calculate the overlapped area "THE GRAY REGION" between red and blue rectangles. Each rectangle is defined by its four corner coordinates. The resulted unit of the overlapped area is unit square. I could not imagine how can …

Read More