Differentiate between line ending within polygon and line passing all the way through polygon - QGIS Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern) Announcing the arrival of Valued Associate #679: Cesar Manara Unicorn Meta Zoo #1: Why another podcast?Documentation “Join Attributes by Location” QGIS 2.18Create polygon layer from polyline layerSort polygons from north to south in QGIS using 'graphical modeler'?The select-by-location tool of ArcMap won't work properly!Using QGIS to find and calculate parts of polylines within polygon?What is the most efficient way to do a spatial join of all raster points within a polygon layer area?Calculating shortest distance between points within polygon using QGIS?How to delete from mutipolygons all but the biggest polygon in QGISHow to only select lines (geometry features) going through a polygon?Sorting by row already pre-selected polygons by location by line?Prevent user from creating self intersected polygons
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Differentiate between line ending within polygon and line passing all the way through polygon - QGIS
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)
Announcing the arrival of Valued Associate #679: Cesar Manara
Unicorn Meta Zoo #1: Why another podcast?Documentation “Join Attributes by Location” QGIS 2.18Create polygon layer from polyline layerSort polygons from north to south in QGIS using 'graphical modeler'?The select-by-location tool of ArcMap won't work properly!Using QGIS to find and calculate parts of polylines within polygon?What is the most efficient way to do a spatial join of all raster points within a polygon layer area?Calculating shortest distance between points within polygon using QGIS?How to delete from mutipolygons all but the biggest polygon in QGISHow to only select lines (geometry features) going through a polygon?Sorting by row already pre-selected polygons by location by line?Prevent user from creating self intersected polygons
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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 Apr 10 at 10:29
Taras
2,3703730
asked Apr 10 at 8:33
JClarksonJClarkson
426
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 Apr 10 at 10:29
Taras
2,3703730
asked Apr 10 at 8:33
JClarksonJClarkson
426
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 Apr 10 at 10:29
Taras
2,3703730
asked Apr 10 at 8:33
JClarksonJClarkson
426
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 Apr 10 at 10:29
Taras
2,3703730
asked Apr 10 at 8:33
JClarksonJClarkson
426
edited Apr 10 at 10:29
Taras
2,3703730
asked Apr 10 at 8:33
JClarksonJClarkson
426
edited Apr 10 at 10:29
Taras
2,3703730
edited Apr 10 at 10:29
Taras
2,3703730
edited Apr 10 at 10:29
Taras
2,3703730
2,3703730
asked Apr 10 at 8:33
JClarksonJClarkson
426
asked Apr 10 at 8:33
JClarksonJClarkson
426
asked Apr 10 at 8:33
JClarksonJClarkson
426
426
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 Apr 10 at 9:03
TarasTaras
2,3703730
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 Apr 10 at 9:03
TarasTaras
2,3703730
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 Apr 10 at 9:03
TarasTaras
2,3703730
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 Apr 10 at 9:03
TarasTaras
2,3703730
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 Apr 10 at 9:03
TarasTaras
2,3703730
edited Apr 10 at 10:52
answered Apr 10 at 9:03
TarasTaras
2,3703730
answered Apr 10 at 9:03
TarasTaras
2,3703730
answered Apr 10 at 9:03
TarasTaras
2,3703730
2,3703730
add a comment |
add a comment |
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