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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, …
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4 votes
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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 …
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2 votes
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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. …
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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 …
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3 votes
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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. …
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7 votes
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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 …
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18 votes
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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 …
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0 votes

Dissolve ogr geometries in Python

I am confused because your WKT features are two distinct polygons
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