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Mar
1
accepted Use spatial queries on multiple layers in QGIS
Feb
28
revised Use spatial queries on multiple layers in QGIS
added 390 characters in body
Feb
28
comment Use spatial queries on multiple layers in QGIS
Indeed, I forgot to mention this. Yes, I know I can work manually on this (selecting features and check the "use selected features" box), but I would rather do this using queries, so I don't have to fiddle between screens and buttons, as I have a lot of operations of this type to do!
Feb
28
asked Use spatial queries on multiple layers in QGIS
Sep
24
awarded  Autobiographer
Oct
8
awarded  Scholar
Oct
8
accepted Improve performances on distance coverage routing - PostgreSQL
Jul
18
awarded  Teacher
Jul
17
awarded  Supporter
Jul
17
answered Improve performances on distance coverage routing - PostgreSQL
Jul
17
comment Improve performances on distance coverage routing - PostgreSQL
Well... the result I want will look almost exactly as your map, but I would use other criteras. The problem here though is to build the algorithm to do so on a postgreSQL DB, using pgRouting (I already got a license of arcGIS which does exactly this, but we want to go opensource)
Jul
16
comment Improve performances on distance coverage routing - PostgreSQL
Hum, no, I really need to know every routes that can be reached, and to what length, from the startpoint over the given distance. Shortest path would only give one, and needs a endpoint... Sorry for my ignorance, but... RW?
Jul
16
comment Improve performances on distance coverage routing - PostgreSQL
Oh, and a problem that brings Driving_distance is that it stops on the fartest vertex it can on the network... while the real distance is very often not on a vertex, but on the line itself! (I hope I'm not just missing something here though!)
Jul
16
comment Improve performances on distance coverage routing - PostgreSQL
Well, it looks like it yes. I have to be able to point a fire station (for example) and get it's coverage for a given distance (let say, 10k, 15k...). So if we could switch the driving time of this to an effective distance, it would make it! Could you tell me more? (And I have to give that note: The problem is not the idea of the how to do it, but how to do it in a relatively fast way :) )
Jul
16
awarded  Editor
Jul
16
comment Improve performances on distance coverage routing - PostgreSQL
I added a case in the question (3rd picture) that shows a problem I think isochrones will give me. Am I wrong to think that in this case (above), the answer won't be precise?
Jul
16
comment Improve performances on distance coverage routing - PostgreSQL
I just added a comment in the question above answering the thing about Driving_distance, though it gave me an idea I'll put to the test tomorrow...
Jul
16
revised Improve performances on distance coverage routing - PostgreSQL
I lacked precision in my question!
Jul
14
awarded  Student
Jul
13
asked Improve performances on distance coverage routing - PostgreSQL