Differentiate between line ending within polygon and line passing all the way through polygon - QGIS
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I have a line file and a polygon file in QGIS.
Primarily I am looking for any polygon that has a line intersecting it - easy, sorted.
From these intersects, I then want to pull out just the polygons that have a line going all the way through them and ignore those where the line ends within the polygon. See the below diagram for an explanation: I only want polygons 2 and 3.
Does that make sense? I haven't managed to find any predefined tools thus far.
qgis select-by-location
edited 14 hours ago
Taras
2,2783729
asked 16 hours ago
JClarksonJClarkson
406
add a comment |
I have a line file and a polygon file in QGIS.
Primarily I am looking for any polygon that has a line intersecting it - easy, sorted.
From these intersects, I then want to pull out just the polygons that have a line going all the way through them and ignore those where the line ends within the polygon. See the below diagram for an explanation: I only want polygons 2 and 3.
Does that make sense? I haven't managed to find any predefined tools thus far.
qgis select-by-location
edited 14 hours ago
Taras
2,2783729
asked 16 hours ago
JClarksonJClarkson
406
add a comment |
I have a line file and a polygon file in QGIS.
Primarily I am looking for any polygon that has a line intersecting it - easy, sorted.
From these intersects, I then want to pull out just the polygons that have a line going all the way through them and ignore those where the line ends within the polygon. See the below diagram for an explanation: I only want polygons 2 and 3.
Does that make sense? I haven't managed to find any predefined tools thus far.
qgis select-by-location
edited 14 hours ago
Taras
2,2783729
asked 16 hours ago
JClarksonJClarkson
406
I have a line file and a polygon file in QGIS.
Primarily I am looking for any polygon that has a line intersecting it - easy, sorted.
From these intersects, I then want to pull out just the polygons that have a line going all the way through them and ignore those where the line ends within the polygon. See the below diagram for an explanation: I only want polygons 2 and 3.
Does that make sense? I haven't managed to find any predefined tools thus far.
qgis select-by-location
qgis select-by-location
edited 14 hours ago
Taras
2,2783729
asked 16 hours ago
JClarksonJClarkson
406
edited 14 hours ago
Taras
2,2783729
asked 16 hours ago
JClarksonJClarkson
406
edited 14 hours ago
Taras
2,2783729
edited 14 hours ago
Taras
2,2783729
edited 14 hours ago
Taras
2,2783729
2,2783729
asked 16 hours ago
JClarksonJClarkson
406
asked 16 hours ago
JClarksonJClarkson
406
asked 16 hours ago
JClarksonJClarkson
406
406
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Tested on QGIS 2.18
I can suggest using a "Virtual Layer" through Layer > Add Layer > Add/Edit Virtual Layer...
Let's assume we have two layers, namely "lines_test" and "polygons"
With using this query you may achieve the result you are looking for.
SELECT *
FROM polygons
WHERE polygons.id NOT IN (
SELECT polygons.id
FROM polygons, lines_test
WHERE ST_Within(ST_StartPoint(lines_test.geometry), polygons.geometry) OR ST_Within(ST_EndPoint(lines_test.geometry), polygons.geometry)
)
References:
PostGIS – Opposite of ST_Within
Chapter 8. PostGIS Reference | 8.5. Geometry Accessors
Documentation “Join Attributes by Location” QGIS 2.18
answered 15 hours ago
TarasTaras
2,2783729
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Tested on QGIS 2.18
I can suggest using a "Virtual Layer" through Layer > Add Layer > Add/Edit Virtual Layer...
Let's assume we have two layers, namely "lines_test" and "polygons"
With using this query you may achieve the result you are looking for.
SELECT *
FROM polygons
WHERE polygons.id NOT IN (
SELECT polygons.id
FROM polygons, lines_test
WHERE ST_Within(ST_StartPoint(lines_test.geometry), polygons.geometry) OR ST_Within(ST_EndPoint(lines_test.geometry), polygons.geometry)
)
References:
PostGIS – Opposite of ST_Within
Chapter 8. PostGIS Reference | 8.5. Geometry Accessors
Documentation “Join Attributes by Location” QGIS 2.18
answered 15 hours ago
TarasTaras
2,2783729
add a comment |
Tested on QGIS 2.18
I can suggest using a "Virtual Layer" through Layer > Add Layer > Add/Edit Virtual Layer...
Let's assume we have two layers, namely "lines_test" and "polygons"
With using this query you may achieve the result you are looking for.
SELECT *
FROM polygons
WHERE polygons.id NOT IN (
SELECT polygons.id
FROM polygons, lines_test
WHERE ST_Within(ST_StartPoint(lines_test.geometry), polygons.geometry) OR ST_Within(ST_EndPoint(lines_test.geometry), polygons.geometry)
)
References:
PostGIS – Opposite of ST_Within
Chapter 8. PostGIS Reference | 8.5. Geometry Accessors
Documentation “Join Attributes by Location” QGIS 2.18
answered 15 hours ago
TarasTaras
2,2783729
add a comment |
Tested on QGIS 2.18
I can suggest using a "Virtual Layer" through Layer > Add Layer > Add/Edit Virtual Layer...
Let's assume we have two layers, namely "lines_test" and "polygons"
With using this query you may achieve the result you are looking for.
SELECT *
FROM polygons
WHERE polygons.id NOT IN (
SELECT polygons.id
FROM polygons, lines_test
WHERE ST_Within(ST_StartPoint(lines_test.geometry), polygons.geometry) OR ST_Within(ST_EndPoint(lines_test.geometry), polygons.geometry)
)
References:
PostGIS – Opposite of ST_Within
Chapter 8. PostGIS Reference | 8.5. Geometry Accessors
Documentation “Join Attributes by Location” QGIS 2.18
answered 15 hours ago
TarasTaras
2,2783729
Tested on QGIS 2.18
I can suggest using a "Virtual Layer" through Layer > Add Layer > Add/Edit Virtual Layer...
Let's assume we have two layers, namely "lines_test" and "polygons"
With using this query you may achieve the result you are looking for.
SELECT *
FROM polygons
WHERE polygons.id NOT IN (
SELECT polygons.id
FROM polygons, lines_test
WHERE ST_Within(ST_StartPoint(lines_test.geometry), polygons.geometry) OR ST_Within(ST_EndPoint(lines_test.geometry), polygons.geometry)
)
References:
PostGIS – Opposite of ST_Within
Chapter 8. PostGIS Reference | 8.5. Geometry Accessors
Documentation “Join Attributes by Location” QGIS 2.18
answered 15 hours ago
TarasTaras
2,2783729
edited 14 hours ago
answered 15 hours ago
TarasTaras
2,2783729
answered 15 hours ago
TarasTaras
2,2783729
answered 15 hours ago
TarasTaras
2,2783729
2,2783729
add a comment |
add a comment |
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