Linked Questions

2
votes
1answer
320 views

QGIS Dissolving and holes [duplicate]

I am using QGIS 2.18.9 and I have a problem. I dissolved a small map with about 1000 small regions into one big polygon, with Vector->geoprocessing tools->dissolve. But after the dissolving ...
2
votes
0answers
56 views

Holes between polygons after dissolve [duplicate]

I’ve got a shapefile of Switzerland. Shown Polygons are 6-digit ZipCodes. Whenever I dissolve the file for example by 4-digit ZipCodes, it results in incorrect polygons. Unfortunately some polygons ...
2
votes
0answers
50 views

Polygons hull QGIS [duplicate]

I'm currently working with old french cadastre on QGIS, I've vectorised it and now I want to tile it. I've georeferenced it, but it's not sufficient for a great result. To improve the result, I would ...
8
votes
1answer
8k views

Shapely polygon union results in strange artifacts of tiny, non-overlapping areas

I am not sure if this is a shapely bug or a problem with my polygons. I have a bunch of polygons that look like this: They are level-12 watersheds provided by HydroBasins, and are presumably non-...
6
votes
2answers
133 views

How to join several inner and outer lines that share the same field in a single polygon?

I have a data source with thousands of lakes, ponds and small puddles. Using an algorithm of anitagraser.com I have managed to clean the ponds and small puddles, but with the big lakes I have a ...
3
votes
0answers
294 views

How to avoid slivers when merging (union) two shapefiles in QGIS?

Here's the kind of tool I want: Preference A: Union the two polygon shapefiles that where the wetland file takes precedence over the forest file when the distance between the edges is less than 20m. ...
2
votes
0answers
263 views

Dissolve polygons with road network gaps

I am using QGIS and have a shapefile of the blocks in a large city, where each polygon is a particular streetblock. The city is divided into various sectors, and each block has information on its ...
1
vote
0answers
263 views

Error while removing gaps with v.clean in QGIS

I have a polygon layer (Geopackage with 378 features in EPSG:3857) with many very small gaps between them (topology checker lists more than 5000). The gaps are in a range of several hundred meters to ...
1
vote
1answer
68 views

Connect outline gaps at vector shape

Could someone shed some light into a method to link breaking outline borders without much distortion from the original like e.g. convex hull does? Convex hull alternative ideas are of course welcome ...
1
vote
0answers
63 views

Automatically deleting lines within generated polygon using QGIS?

How do I automatically delete lines within a generated polygon? what I have: is a polygon with lines within. The lines I want to be deleted automatically -- like a auto clean up. This is what I did: ...
2
votes
0answers
45 views

Empty pixels in polygon border

I have a vector shape file with the basins of South Carolina. Some of the sub-basins polygons have a "hole" or no data pixel in their boundary (See photos for reference 2) and I need them to ...