Convert multipolygon geometry into list

Question

How can I please convert a multipolygon geometry into a list? I tried this:

mycoords=geom.exterior.coords
mycoordslist = list(mycoords)

But I get the error:

AttributeError: 'MultiPolygon' object has no attribute 'exterior'

score 11 · Accepted Answer · answered Sep 28 '20 at 09:18

11

You will have to loop over geometries within your MultiPolygon.

mycoordslist = [list(x.exterior.coords) for x in geom.geoms]

Note that the result is a list of coords lists.

answered Sep 28 '20 at 09:18

martinfleis

7,124
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I tried this and get this error: AttributeError: 'Polygon' object has no attribute 'geoms' – mee Sep 28 '20 at 10:00
5

@mee Only when `geom.type=='MultiPolygon'`. – swatchai Sep 28 '20 at 10:38
`mycoordslist = [list(x.exterior.coords) for x in geom]` will work as of now. if `geom.type == 'MultiPolygon'` – Prakash Dahal Apr 01 '22 at 18:40
@PrakashDahal That will stop working in shapely 2.0. You already get a deprecation warning about that in 1.8. – martinfleis Apr 02 '22 at 15:18

score 1 · Answer 2 · answered Sep 28 '20 at 09:19

1

The error raise simply because you are trying to get coordinates from the wrong attribute, exterior is an attribute of Polygon, not of MultyPolygon.

This could work:

mycoordslist = [poly.exterior.coords for poly in list(geom)]

answered Sep 28 '20 at 09:19

Khaos101

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Convert multipolygon geometry into list

2 Answers2