All Questions
1,690
questions
44
votes
5
answers
29k
views
Calculating average width of polygon? [closed]
I'm interested in examining the average width of a polygon that represents the road surface. I also have the road centerline as a vector (which is sometimes not exactly in the center). In this example,...
- 16.3k
7
votes
2
answers
2k
views
How to create zip code areas from point data?
I have a point dataset which has zipcodes for a certain region. This zipcodes have been marked on the basis of lat long collected. So each zipcode is repeated as it would be useful to show the region ...
- 3,389
1
vote
2
answers
2k
views
Removing overlapping buffer in QGIS
I wanna know how to do this in QGIS:
I've tried many ways, but still can't find the right solution.
- 11
1
vote
1
answer
436
views
Highlighting and exporting raster layer based on vector polygon
I am a Quantum GIS beginner. I have a set of adjacent polygons in a vector layer that is overlaid on a raster layer of OS StreetView OpenData. I want to be able to select each of these polygons and ...
- 141
8
votes
1
answer
5k
views
Calculating size of particular area below buffer in QGIS?
I have a point shapefile of villages where data was collected in Northern Kenya. I created a buffer around those villages.
The second vector layer contains polygons defining areas according to ...
- 81
16
votes
4
answers
41k
views
Transforming polygon to linestring in QGIS
I have a polygon, imported from a shapefile in QGIS. I would like transform it to a linestring instead so I can save it as a GPX file later.
How can I transform a polygon to a linestring in QGIS?
- 2,231
4
votes
1
answer
16k
views
How to select and copy a group of polygons in QGIS?
I'm new to QGIS. I opened a few shapefiles that cover Europe. Now I want to select a smaller area and if possible copy the polygons in this area so I can work with a smaller set. How should I do this ...
- 2,231
10
votes
3
answers
8k
views
Generalizing Polygons to MultiPolygons in GeoDjango?
I set up a model with models.PolygonField in geodjango, using postgres as database. I try to import shp into postgres. The problem is, shp (compiled with QGIS) mixes polygon and multipolygon, hence it ...
- 771
7
votes
1
answer
2k
views
How to create a polygon from other polygon boundaries?
I want to write an algorithm that creates a polygon inside a hole made by a set of other polygons. It's something like a flood fill and it's like the "boundary" tool in Autocad.
The image shows an ...
- 9,825
6
votes
1
answer
3k
views
Transform polygon to equivalent circle, QGis
I have a polygon and I'd like to find the radius of an equivalent circle from a particular point within the polygon. The polygon would have a large (infinite) number of points evenly distributed ...
- 467