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Results tagged with qgis
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user 960
QGIS is a cross-platform GIS application licensed under the GNU General Public License.
7
votes
Accepted
Invalid Geometry Error after ST_ConvexHull
my guess is that you get invalid polygons because one or more groups only have one or two points. that can not make a convexhull polygon.
if that is the problem you can exclude the problematic groups …
- 13.3k
6
votes
Calculating lat/lons from PostGIS table which has projected coordinate system?
I think ST_Transform is your friend.
- 13.3k
6
votes
Accepted
Distance between points and polygons in QGIS / PostGIS
Then you can open that view in QGIS and get your distances. When the tables changes the view will be updated.
/Nicklas …
- 13.3k
5
votes
Accepted
Simplify/generalize Polygons and keep topology of different layers PostGIS/QGIS
The best approach I guess is using real topology data.
Then you can share the edges between data sets and simplify as much as you want.
Here is an example from the man behind the topology impliment …
- 13.3k
5
votes
1
answer
559
views
GPS problem in QGIS
The position is fixed in QGIS, it is not "walking around" as expected. I see the altitude is changing though, but not lon lat. … In gpsmon, and Foxtrot gps I get another position than in QGIS and the position in the other clients is moving around. …
- 13.3k
4
votes
How to migrate from ArcGIS for Desktop to QGIS?
As you say yourself I think all this can be done in QGIS. … at storing your data in PostGIS. when postgis 2 is out you will have rastersupport in the database and you will be able to do a lot of raster analysing directly in the database. and show the result in qgis …
- 13.3k
4
votes
Accepted
Qgis is slow with complex 'postgis query' layer. How to speed up?
Hallo
Is it the QGIS rendering that makes things slow or the PostGIS query. Is the query in the definition of a view or why does it need to med evaluated more than once? …
- 13.3k
4
votes
Reading ODBC connection using QGIS?
an alternative approach would be to move the data to postgis. you can read the csv-file directly with the postgresql copy-command. then you can create points fom the xy-fields.
then if you want to u …
- 13.3k
4
votes
Accepted
What's the PostGIS equivalent to Extract Nodes in fTools / QGIS?
Yo can use ST_DumpPoints(geom) to get the points listed.
Look at the example how to use it.
The result contains both the geometry and a path telling where in the polygon the point belongs. So to j …
- 13.3k
3
votes
Creating polygons from one to many relationship of points using QGIS or PostGIS?
I think it sounds like what you want to do is a grouping on more than one field. you want to group the points by both their polygon belonging and their company belonging.
If that is what you want it …
- 13.3k
3
votes
Accepted
Find closest point on a MulitLineString for each point of a MultiPoint
What you need to do is first find the closes geometry, and then find the closest point on that geometry.
This can be done in a few ways:
select st_closestpoint(a_geom, b_geom), a_id, b_id from
(
…
- 13.3k
2
votes
How to speed up working with QGIS 1.7.4 or is it slow?
my guess is that you have some locking issue in the database. If renaming the table takes time it is not because the renaming takes time but the db waits for something.
Have you tried restarting the …
- 13.3k
2
votes
Select points within a relative number range
If it isn't huge tables it should be no problem to just create a view and use that in QGIS:
CREATE VIEW range50 AS
SELECT a.gid, b.gid, a.the_geom, b.the_geom
FROM the_table a INNER JOIN the_table b … This table is also the right place to put information about how to style the result in QGIS like size of markers. …
- 13.3k