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Touching Polygon Intersection
The Next CEO of Stack OverflowCalculating intersection between points and polygon in shapefileDetermine if point is within an irregular polygon using PythonAdding a Property (attribute) to a geometry in Shapely/FionaIntersection postgis TopologyExceptionLine vs. Polygon Intersection CoordinatesMulti-part Geometrical Intersection errorPolygon intersection with LineString in PostGisEditing touching polygons simultaneously?Geopandas Line Polygon IntersectionHow is intersection implemented in Shapely?
I have two touching Polygons (two neighbouring counties) and there intersection is a MultiLineString, where:
len(list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms))
list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms )[0]
list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms )[1]
gives:
924
LINESTRING (-7.1060859 53.1680546, -7.1061766 53.1678101)
LINESTRING (-7.1061766 53.1678101, -7.1072205 53.1666679)
I would have expected instead:
len(list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms))
len(list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms)[0])
to give:
1
924
why is intersection giving the result like this? I wish to simplify the borders between a set of bordering counties by reducing the number of points, while at the same time preserving topology.
topology shapely matplotlib
asked Mar 17 '18 at 20:51
BazBaz
1022
bumped to the homepage by Community♦ yesterday
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
I have two touching Polygons (two neighbouring counties) and there intersection is a MultiLineString, where:
len(list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms))
list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms )[0]
list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms )[1]
gives:
924
LINESTRING (-7.1060859 53.1680546, -7.1061766 53.1678101)
LINESTRING (-7.1061766 53.1678101, -7.1072205 53.1666679)
I would have expected instead:
len(list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms))
len(list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms)[0])
to give:
1
924
why is intersection giving the result like this? I wish to simplify the borders between a set of bordering counties by reducing the number of points, while at the same time preserving topology.
topology shapely matplotlib
asked Mar 17 '18 at 20:51
BazBaz
1022
bumped to the homepage by Community♦ yesterday
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
Without knowing your data, this is guesswork.
– inc42
Aug 4 '18 at 9:11
add a comment |
I have two touching Polygons (two neighbouring counties) and there intersection is a MultiLineString, where:
len(list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms))
list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms )[0]
list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms )[1]
gives:
924
LINESTRING (-7.1060859 53.1680546, -7.1061766 53.1678101)
LINESTRING (-7.1061766 53.1678101, -7.1072205 53.1666679)
I would have expected instead:
len(list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms))
len(list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms)[0])
to give:
1
924
why is intersection giving the result like this? I wish to simplify the borders between a set of bordering counties by reducing the number of points, while at the same time preserving topology.
topology shapely matplotlib
asked Mar 17 '18 at 20:51
BazBaz
1022
I have two touching Polygons (two neighbouring counties) and there intersection is a MultiLineString, where:
len(list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms))
list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms )[0]
list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms )[1]
gives:
924
LINESTRING (-7.1060859 53.1680546, -7.1061766 53.1678101)
LINESTRING (-7.1061766 53.1678101, -7.1072205 53.1666679)
I would have expected instead:
len(list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms))
len(list(counties["King's Co."].intersection(counties["Queen's Co."]).geoms)[0])
to give:
1
924
why is intersection giving the result like this? I wish to simplify the borders between a set of bordering counties by reducing the number of points, while at the same time preserving topology.
topology shapely matplotlib
topology shapely matplotlib
asked Mar 17 '18 at 20:51
BazBaz
1022
asked Mar 17 '18 at 20:51
BazBaz
1022
asked Mar 17 '18 at 20:51
BazBaz
1022
asked Mar 17 '18 at 20:51
BazBaz
1022
asked Mar 17 '18 at 20:51
BazBaz
1022
1022
bumped to the homepage by Community♦ yesterday
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ yesterday
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
Without knowing your data, this is guesswork.
– inc42
Aug 4 '18 at 9:11
add a comment |
Without knowing your data, this is guesswork.
– inc42
Aug 4 '18 at 9:11
Without knowing your data, this is guesswork.
– inc42
Aug 4 '18 at 9:11
Without knowing your data, this is guesswork.
– inc42
Aug 4 '18 at 9:11
add a comment |
1 Answer
1
active
oldest
votes
In your case;
mls = a.intersection(b)returnsMultiLineString.len(mls)gives you lines' count inmls.gs = mls.geomsreturnsGeometrySequenceandlen(gs)equalslen(mls).
So, len(mls) = len(mls.geoms) = len(list(mls)) = len(list(mls.geoms)).
More specifically, it's all about __len__() special class method definition.
Note that len(list(mls)) equals len(list(mls.geoms)), however, list(mls)==list(mls.geoms) returns False(but, of course, lines in the lists have similar geometry)
answered Mar 18 '18 at 0:33
Kadir ŞahbazKadir Şahbaz
4,48721231
But why do I get these 2 point LINESTRINGs? I would like a LINESTRING containing all the boarding points, presuming the counties have a single border with each other.
– Baz
Mar 18 '18 at 8:46
There is probably a small gap between them or the points that you think are overlapping in the two counties' polygon are not actually overlapping.
– Kadir Şahbaz
Mar 18 '18 at 18:51
add a comment |
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1 Answer
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1 Answer
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In your case;
mls = a.intersection(b)returnsMultiLineString.len(mls)gives you lines' count inmls.gs = mls.geomsreturnsGeometrySequenceandlen(gs)equalslen(mls).
So, len(mls) = len(mls.geoms) = len(list(mls)) = len(list(mls.geoms)).
More specifically, it's all about __len__() special class method definition.
Note that len(list(mls)) equals len(list(mls.geoms)), however, list(mls)==list(mls.geoms) returns False(but, of course, lines in the lists have similar geometry)
answered Mar 18 '18 at 0:33
Kadir ŞahbazKadir Şahbaz
4,48721231
But why do I get these 2 point LINESTRINGs? I would like a LINESTRING containing all the boarding points, presuming the counties have a single border with each other.
– Baz
Mar 18 '18 at 8:46
There is probably a small gap between them or the points that you think are overlapping in the two counties' polygon are not actually overlapping.
– Kadir Şahbaz
Mar 18 '18 at 18:51
add a comment |
In your case;
mls = a.intersection(b)returnsMultiLineString.len(mls)gives you lines' count inmls.gs = mls.geomsreturnsGeometrySequenceandlen(gs)equalslen(mls).
So, len(mls) = len(mls.geoms) = len(list(mls)) = len(list(mls.geoms)).
More specifically, it's all about __len__() special class method definition.
Note that len(list(mls)) equals len(list(mls.geoms)), however, list(mls)==list(mls.geoms) returns False(but, of course, lines in the lists have similar geometry)
answered Mar 18 '18 at 0:33
Kadir ŞahbazKadir Şahbaz
4,48721231
But why do I get these 2 point LINESTRINGs? I would like a LINESTRING containing all the boarding points, presuming the counties have a single border with each other.
– Baz
Mar 18 '18 at 8:46
There is probably a small gap between them or the points that you think are overlapping in the two counties' polygon are not actually overlapping.
– Kadir Şahbaz
Mar 18 '18 at 18:51
add a comment |
In your case;
mls = a.intersection(b)returnsMultiLineString.len(mls)gives you lines' count inmls.gs = mls.geomsreturnsGeometrySequenceandlen(gs)equalslen(mls).
So, len(mls) = len(mls.geoms) = len(list(mls)) = len(list(mls.geoms)).
More specifically, it's all about __len__() special class method definition.
Note that len(list(mls)) equals len(list(mls.geoms)), however, list(mls)==list(mls.geoms) returns False(but, of course, lines in the lists have similar geometry)
answered Mar 18 '18 at 0:33
Kadir ŞahbazKadir Şahbaz
4,48721231
In your case;
mls = a.intersection(b)returnsMultiLineString.len(mls)gives you lines' count inmls.gs = mls.geomsreturnsGeometrySequenceandlen(gs)equalslen(mls).
So, len(mls) = len(mls.geoms) = len(list(mls)) = len(list(mls.geoms)).
More specifically, it's all about __len__() special class method definition.
Note that len(list(mls)) equals len(list(mls.geoms)), however, list(mls)==list(mls.geoms) returns False(but, of course, lines in the lists have similar geometry)
answered Mar 18 '18 at 0:33
Kadir ŞahbazKadir Şahbaz
4,48721231
answered Mar 18 '18 at 0:33
Kadir ŞahbazKadir Şahbaz
4,48721231
answered Mar 18 '18 at 0:33
Kadir ŞahbazKadir Şahbaz
4,48721231
answered Mar 18 '18 at 0:33
Kadir ŞahbazKadir Şahbaz
4,48721231
4,48721231
But why do I get these 2 point LINESTRINGs? I would like a LINESTRING containing all the boarding points, presuming the counties have a single border with each other.
– Baz
Mar 18 '18 at 8:46
There is probably a small gap between them or the points that you think are overlapping in the two counties' polygon are not actually overlapping.
– Kadir Şahbaz
Mar 18 '18 at 18:51
add a comment |
But why do I get these 2 point LINESTRINGs? I would like a LINESTRING containing all the boarding points, presuming the counties have a single border with each other.
– Baz
Mar 18 '18 at 8:46
There is probably a small gap between them or the points that you think are overlapping in the two counties' polygon are not actually overlapping.
– Kadir Şahbaz
Mar 18 '18 at 18:51
But why do I get these 2 point LINESTRINGs? I would like a LINESTRING containing all the boarding points, presuming the counties have a single border with each other.
– Baz
Mar 18 '18 at 8:46
But why do I get these 2 point LINESTRINGs? I would like a LINESTRING containing all the boarding points, presuming the counties have a single border with each other.
– Baz
Mar 18 '18 at 8:46
There is probably a small gap between them or the points that you think are overlapping in the two counties' polygon are not actually overlapping.
– Kadir Şahbaz
Mar 18 '18 at 18:51
There is probably a small gap between them or the points that you think are overlapping in the two counties' polygon are not actually overlapping.
– Kadir Şahbaz
Mar 18 '18 at 18:51
add a comment |
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Without knowing your data, this is guesswork.
– inc42
Aug 4 '18 at 9:11