All Questions
117
questions
2
votes
1
answer
4k
views
Recover lost polygons from shapefile in QGIS
I've committed a newbie error it seems in GQIS with a polygon shapefile.
I wanted to remove about 15 of the 210 polygons, and put those 15 in another file.
I made a duplicate of the polygon ...
- 33
3
votes
1
answer
1k
views
Overlapping polygons layer order
Is there a way in QGIS to prioritize the layering order overlapping polygons. I have a shapefile with numbers in the attribute table from 1-20. Each number is associated with its own polygon. I want ...
- 131
12
votes
3
answers
7k
views
Voronoi Diagram on a given polygon using QGIS
I am trying to create a Voronoi Diagram on a specific polygon, but there is some issue when dealing with edges.
Here is how I do it:
Preparing the points for Voronoi and the polygon for the diagram
...
- 365
3
votes
4
answers
3k
views
Filtering out labels surrounding active feature in Atlas
Let me put it this way, if I’ve tried data-defined rendering and the common featureid expression and it’s still not working - and I think one or both options should - what basic thing could I be ...
- 31
2
votes
2
answers
843
views
Points to shapefile, with curved lines given center and radius (QGIS)
I'm a newbie in GIS and for a project I need to create a shapefile given some points in lat/lon. I have been following this tutorial: https://community.pyramidanalytics.com/t/q5tk8w/creating-a-...
- 133
1
vote
1
answer
621
views
Polygons are unable to be edited and have no feature, although they are listed in attribute table with three features
I found that several lakes in the GRanD database (global reservoirs and dams) are unable to be selected for editing like normal polygons, and they have no feature at all, although they are shown in ...
- 407
2
votes
2
answers
4k
views
Cannot select polygon from shapefile in QGIS?
I am working currently on a small-scale map using among other sources Natural Earth shapefiles (NE).
For an unknown reason, one of the polygons created by me on the basis of the fragments of NE ...
0
votes
1
answer
63
views
Polygonal shapefile: dissolving adjacent ones
I would like to solve a issue related to a land use shapefile.
I would like to "merge/dissolve" just the adjacent polygons that have the same attribute. How can I do this using QGIS?
- 395
3
votes
2
answers
4k
views
QGIS "Sum Line Lengths" return 'nan.'
I have a polygon shapefile and a (merged) line shapefile (both are zipped). When I use Vector -> Analysis Tools -> Sum Line Lengths on these shapefiles, I get a layer with some of the LENGTHS filled ...
- 31
2
votes
3
answers
5k
views
Calculating polygon area within polygons in QGIS
I want to estimate the area of the reef under a polygon grid.
My shapefiles are already in meters, however I am having a hard time calculating the area under the grid layer. Attached are the photos.
I ...
- 21
4
votes
3
answers
16k
views
Make polygon circular in QGIS
I have drawn a polygon in a shape-layer, but it's not perfectly circular. Is there a way to either
Draw a circular polygon with a given radius (in a shape-layer)
Make a polygon into a circle
I have ...
6
votes
1
answer
2k
views
Turning vector grid into individual shapefiles using QGIS?
I am using QGIS and I created a vector grid on a crop field in order to cut it into plots. I want to save each grid cell into individual polygon shapefiles automatically.
Here is an example of a ...
- 63
1
vote
1
answer
155
views
QGIS Union erroneously creating gaps
I'm trying to do a union between two Polygon Shapefiles, but when I do Vector > Geoprocessing Tools > Union I have the odd issue where most of it works fine, but some areas are returned in the union ...
- 11
0
votes
1
answer
1k
views
How to get parcel boundaries with tax roll, land use, and zoning info?
How do I get parcel boundary shapefiles with tax roll, land use and zoning info included?
Is it possible to just create the parcel boundaries data from scratch, i.e. could I create parcel polygons in ...
- 649
2
votes
1
answer
78
views
Splitting polygons between two shapefiles in QGIS
In QGIS I have two overlapping shapefiles. Is there any way, where I can select polygons from the 1st shapefile and trim everything that overlaps with them, in the 2nd shapefile?
- 95