Questions tagged [circularstring]

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9
votes
2answers
2k views

Storing GML surface in PostGIS

I'm using PostGIS 2.0.0 and would like to store a GML Surface in a way that allows calculating intersections between that surface and various points and lines. In my case, the Surface will have one ...
5
votes
1answer
2k views

How to draw or edit curved lines in free GIS?

I'm searching informations about drawing simple curved arrow lines into free GIS like QGIS, in this problem data geometry is CIRCULARSTRING ( a type which exists in latest postgis version) It seems ...
3
votes
3answers
2k views

ST_MakeLine equivalent for CIRCULARSTRING in PostGIS

I'd like to make a CIRCULARSTRING in PostGIS 2.0.0 out of points that are calculated as part of the query (rather than constants). For a LINESTRING I can do this using ST_MakeLine(). Is there an ...
1
vote
1answer
35 views

Changing date format in field name from d2000_5000 to Dddmmyyyy? [closed]

I am trying to change the name of a field by using Python code where the current name is in the format (e.g.) d2000_5000, and 5000 is the decimal year (0,5 y) added to 2000. So i think that this can ...
1
vote
0answers
50 views

How to add filled circular rings (digitized) in vector layer

I digitize different habitats in one nature reserve. There was 40 ponds - I use "add circular string" option to give them a nice rounded shape. When I finish this 40 ponds I was instructed also to do ...