Tagged Questions
0
votes
0answers
12 views
pgRouting：routing problems using reverse_cost
I saw this post：Routing issues with pgrouting, and try the ability of reverse_cost.
As the result of this post, if there is only one way to go from one node to another, even though the reverse_cost ...
0
votes
1answer
41 views
Can pgRouting work more efficiently？
I use a river network on which has a lot of nodes to test pgRouting,
and I run the SQL, searching for the shortest path between nodes.
SELECT * FROM shortest_path('
SELECT gid as id,
...
1
vote
1answer
51 views
pgRouting：how to use reverse_cost？
I add a new column, naming it "reverse_cost", and give it the same data in the shape_leng column.
But as I run the shortest path algorithm in pgadmin, I got an error message.
here's my sql code
...
2
votes
1answer
126 views
generate height data from DTED maps
I have 16 DTED maps of (1 degree x 1 degree). I have to generate combined height matrix of maximum 4 (1 degree x 1 degree) DTED maps in my C++ application.
Can someone suggest to me which open source ...
7
votes
1answer
221 views
How to split two interscting polygons by the average linestring of the shared area (QGIS / python shapely)
I have two polygons,
POLYGON((-5 -5,-5 5,5 5,5 -5,-5 -5))
POLYGON((1 1, 1 7, 7 7, 7 1, 1 1))
and wish to split them evenly.
The result should be a split along the red marked line.
I'm using ...
3
votes
3answers
2k views
how to create a new postgis database for usage with QGIS under windows
After installing postgresql with postgis under windows xp I have 3 databases:
postgis
postgres
template_postgis
now I try to create a new spatially enabled database in pgAdminIII: I select ...
