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Results tagged with pgrouting
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user 21952
pgRouting extends the PostGIS / PostgreSQL geospatial database to provide geospatial routing functionality.
1
vote
2
answers
1k
views
PostGIS pgr_dijkstra function not finding node that appears in ways table?
I should mention that the prg_dijkstra function I use here is the prg_dijkstra wrapper function given on the workshop website on the pgrouting homepage. …
- 311
2
votes
1
answer
172
views
Improving speed on pgRouting on table update with many rows: faster to loop on each row than...
I am updating thousands of rows in a survey table finding shortest path from each place a survey respondent visits. My code below is the query I use to update the blank route column. The function "p …
- 311
2
votes
2
answers
506
views
problem transforming pgr route to a line - unexpected extra lines from St_MakeLine
I have created a line geometry from a pgr_dijkstra querry and I am getting an unexpected looking line in qgis. The following image illustrates the problem:
The magenta line is the line created fro …
- 311
3
votes
2
answers
1k
views
adding geometries to a source, target table for multiple rows in pgrouting
I am having an issue trying to perform the pgr_dijkstra algorithm and getting back a line in my table for multiple rows. I have a table that has a columns of source, target node id's but I cannot fig …
- 311
1
vote
adding geometries to a source, target table for multiple rows in pgrouting
I have solved the problem with the simple querry
update analysis.routing
set
routeline = (select st_makeline(pgr.geom) ,
from (select * from pgr_dijkstra('ways',source,target)) as pgr)
- 311