303 reputation
110
bio website danpearce.co.uk
location Paris, France
age 32
visits member for 2 years, 1 month
seen Sep 15 at 11:36

Engineer/Researcher working on environmental projects for aviation.


Jul
2
awarded  Curious
Mar
31
awarded  Yearling
Feb
11
accepted Label features on hover/click with QGIS?
Feb
11
asked Label features on hover/click with QGIS?
Jan
21
accepted Convert planar distance to ellipsoid (real) distance
Jan
21
comment Convert planar distance to ellipsoid (real) distance
Seems it is a version issue. More recent versions of the spatialite DLL (e.g. 4.0.0) run the query without issue.
Jan
21
comment Convert planar distance to ellipsoid (real) distance
Thanks for your expert help MerseyViking. I get the response "wrong number of arguments to function ST_Length()" when using the above. Should this work with spatialite? Do I need a specific version of spatialite?
Jan
21
revised Convert planar distance to ellipsoid (real) distance
added 199 characters in body
Jan
21
asked Convert planar distance to ellipsoid (real) distance
Jan
21
comment How can I get the ellipsoidal values for length and area using spatialite?
So I have corrected the issue with CRS. But the value returned is still the planar distance (3.1km) rather than the actual (ellipsoidal) distance. QGIS can do this calculation using the ruler tool. I'd love to know what the calculation is!
Jan
20
accepted How can I get the ellipsoidal values for length and area using spatialite?
Jan
20
comment How can I get the ellipsoidal values for length and area using spatialite?
Hi Simplexio, Thanks for the information. So to clarify: even though I define the layer as Srid 4326 when it is created and loaded into QGIS, features are being written with coordinates as if it is a Srid 3857 layer (as this is the working unit of the currently active map)? Sounds like a simple enough thing to correct anyway :-)
Jan
20
asked How can I get the ellipsoidal values for length and area using spatialite?
Nov
27
asked Set QGIS vector layer custom properties
Aug
30
comment Get features in order they are selected using QGIS
Odd. I get the following error from your example: TypeError: onSelectionChanged() takes exactly 3 arguments (2 given). Perhaps an issue with it being a custom UI that uses self?
Aug
30
answered How to show QGIS plugin dialog always on top?
Aug
30
comment Get features in order they are selected using QGIS
Thanks for the tips, Matthias. It looks like the connection on selectionChanged will do what I need. Could you provide an example of the connection though? I'm not familiar with the structure here and quite how to pass the feature ids into my custom function. Thanks in advance.
Aug
30
comment Offsetting Points by location
You might get some more advice by adding ArcGIS to your question tags then.
Aug
30
answered Offsetting Points by location
Aug
30
asked Get features in order they are selected using QGIS