Questions tagged [st-split]
The st-split tag has no usage guidance.
12
questions
3
votes
1
answer
53
views
Custom ST_MultiSplit PostgreSQL function error, to split one layer with another
I have a lines layer which I would like to split with a points layer.
I first created the a ST_MultiSplit function:
CREATE OR REPLACE FUNCTION ST_MultiSplit(geom Geometry, blades Geometry) RETURNS ...
- 75
2
votes
1
answer
87
views
ST_Split only on blade
If the geometry input (a line string in my case) crosses over itself, ST_Split is splitting on the crossover as well as the blade. Is that the expected case / is it possible to only split on the blade?...
- 21
5
votes
2
answers
115
views
St_Split not split line by point
I want to split a line by point in postgis. But the result is whole line without splitting.
I work with closest point on input line. This is my query:
select
st_split(
_input,
...
- 193
6
votes
2
answers
316
views
Splitting lines by multiple polygons, taking length of particular segment, using PostGIS
I have a table of 100k+ non-overlapping POLYGON features, and a table of 50k+ simple LINESTRING features (each line has only 2 vertices). The below is a common arrangement of these features on a map, ...
- 1,657
0
votes
1
answer
80
views
Split Polygon in one layer based on boundaries in second layer
I have two different polygon layers, 1 and 2. Now i want to split polygons in layer 1 taking reference from polygons in layer 2. Is it possible in qgis???? Please find attached image as reference ...
- 613
2
votes
1
answer
41
views
Intersecting Polygon by a Gridded Polygon returns unexpected result
I have a regular polygon grid (grid) and irregular polygons (block). You can download the data here: https://we.tl/t-BczpR2K2lw
I want to intersect the orange polygons (block) by the regular polygon ...
- 3,249
4
votes
1
answer
511
views
PostGIS order intersections of line and polygon
I have a polygon and a line that goes through it. That line might exit my polygon and enter it again at a later point.
So now I'd like to have a relative position inside my line, where those segments ...
- 971
2
votes
2
answers
361
views
Split lines by a polygon - Why are "internal" lines split in parts using sf/st_split
The context: I have a border and routes followed by vehicles. I want to
decompose the routes, cutting them everytime they cross a border, and
for each part, know what are the distances performed.
...
- 795
1
vote
2
answers
399
views
Removing longest segment of linestring and rejoining segments
I am trying to remove the segment that has the longest length from a linestring and join the two group of segments that remain by the shortest segment between them.
That was easy, using ST_Difference (...
- 181
1
vote
0
answers
231
views
ST_Split with ST_Dump returns multipart Linestring with additional Splits
I am trying to split a lingstring using another linestring as my blade. The line to be cut crosses over itself at different locations. (to_be_cut is linestring, not multilinestring)
My query ...
- 161
4
votes
1
answer
194
views
Splitting self-overlapping lines with points using PostGIS
I have a line geometry that partially overlaps itself (think about a line going A -> B -> C -> B -> D) and a set of points (not on the line but close to it) that I want to use to split the line in ...
- 41
5
votes
2
answers
2k
views
Splitting lines into basic segments at vertices with PostGIS?
I have a MultiLineString table in PostgreSQL and I am trying to obtain a table with all the segments obtained from those lines if we split them at their vertices.
I have found this simple example, ...
- 1,176