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To merge features based on specified attributes.
2
votes
Dissolving by two fields in QGIS?
Something like this should work with ogr2ogr:
ogr2ogr -f "ESRI Shapefile" -dialect sqlite -sql "select st_union(geometry) as geometry,attribute_1 a,attribute_2 b from my_data group by a,b order by a, …
4
votes
Accepted
ogr2ogr dissolve shapefile
As ogrinfo shows, the layer name is All_constraints_v5 and therefore the righ command is
ogr2ogr C:\Users\name\Desktop\output.shp C:\Users\name\Desktop\All_constraints_v5.shp -dialect sqlite -sql "SE …
2
votes
Accepted
Buffer and dissolve layer with GeoTools
The "dissolve result" option in QGIS is actually another function that is processing the whole layer that is first created with buffer. …
3
votes
Dissolving polygon on QGIS
OpenJUMP has a tool "Show vertices in fence" that can be used for evaluating what tolerance to use for snapping. For example in this place
the difference in the coordinates of the vertices is minimal …
3
votes
Accepted
How to dissolve naturalearth vectordata with gdal?
The union is created but the function does not "dissolve" the parts but writes them as separate parts of a multipolygon. And that happens because the common line segment only looks like common. …
7
votes
Accepted
Merging overlapping polygons with SpatiaLite
Here is a step-wise process. Queries were made with Spatialite-gui and visualizations with OpenJUMP.
Take some points into table "points" with an attribute "radius".
Buffer points by taking the r …
18
votes
Accepted
Cleaning large Shapefile using v.clean in order to dissolve features?
The source data seems to be rather hard to handle as vectors as you have noticed. However, this workaroung that goes through an intermediate raster file works well and it is very fast.
1) Use gdal_ra …
0
votes
Dissolve ogr geometries in Python
I am confused because your WKT features are two distinct polygons