Questions tagged [dissolve]

To merge features based on specified attributes.

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QGIS Calculate Percentage Area of Grid Cell

I'm trying to use QGIS to calculate the area of each grid cell that has been deforested. To do so, I have tried the following: Create Grid to create a 30km x 30km square grid Add Deforestation Layer (...
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Dissolve multiple layers

I want to dissolve over 100 shapefiles into same attributes to eliminate number of features. I was going to merge all the polygon first then dissolve it, but each layer has 10,000 to over 50,000 ...
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3 votes
1 answer
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Removing partly overlapping lines within the same feature

I have several layers which have features with several parts. These parts are often overlapping however and as a result the Length of the feature is often not correct when I calculate it using $length....
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3 votes
2 answers
68 views

Merging/Dissolving multiple layers in QGIS Virtual Layer

I have several polygon layers that I would like to merge and dissolve within a virtual layer in QGIS. So that any changes made to the individual layers will automatically update in the merged/...
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Dissolve a intersection along id and keep only features of the bigger area QGIS

In QGIS I'm trying to dissolve an intersection and keep only the features with the bigger area [blue arrow] (compared with other features with same id [red box]). I'm interested in keeping other ...
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Combining non-contiguous polygons in ArcGIS Pro

I am trying to combine non-contiguous polygons that are close but not touching one shape. As if you were to draw a line around these five parts connecting them into one. Originally these were part of ...
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2 votes
1 answer
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How to merge the attributes of point shapefile in QGIS

I am trying to make wind map in QGIS, where I used vector point shapefile. Because I have two different shapefiles I first merged them: Then I Dissolve it where I choose two attributes to dissolved: ...
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1 answer
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Dissolving features based on another layer in QGIS

I have two layers, see image below: Yellow: the ground where people can build; Red: existing buildings. Create a shapefile of all grounds where >50% of the grounds are free. In order to do this, ...
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1 answer
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Does a tool exist to merge multiple things in a table at once?

Is there a tool that can merge specific things in a table at once? The problem I currently have is that I have about 110 different features in a table and all of them have another entry with the same ...
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2 votes
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60 views

Why does Dissolve tool create little holes in the resulting polygon?

I tried to dissolve a couple of polygons and found out that it creates little holes in the Polygon (see: QGIS Dissolving and holes). I knew how to 'fill' the holes (with v.clean) but I am wondering ...
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3 votes
1 answer
39 views

Merging features of the same class in QGIS

I am running with a problem that I want to merge all the features of the same vector class into one attribute. Below the green layer is the forest layer that has more than 11 thousand features, I want ...
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1 vote
1 answer
52 views

Merging multiple intersecting/overlapping polygons in QGIS [duplicate]

Is there a way in QGIS to select multiple polygons and merge only the ones that intersect/overlap with each other? As in the example bellow only those appointed would merge, becoming each a single ...
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Dissolving polygon on QGIS

I have a grid of polygons as in the figure below; I need to dissolve the polygons into a single feature. I used the Dissolve tool on QGIS without specifying any dissolve field. The QGIS result is ...
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4 votes
1 answer
109 views

QGIS: Dissolve adjacent small polygons

Does anybody know a solution for this qgis task? I have a polygon layer with many small and bigger polygons. I would like to merge/dissolve the polygons smaller than 100 m² with directly adjacent (...
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  • 309
1 vote
0 answers
57 views

Unable to aggregate line segments while summing values

I've a layer with multilines, overlapping to a various degrees. I need to merge/dissolve them "downwards" while summing their values for the overlapping segments. I made it to "Union&...
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2 votes
1 answer
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Multiple Unions & Dissolve for Buffers

I'm a new user of QGIS 3.10.4. I need to create contours on maps using buffer, union and dissolve functions in QGIS. The buffers will be from multiple points. Is there any way I can unionize and ...
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2 votes
1 answer
283 views

QGIS Union is slow. How to speed up or which alternative to use, creating the same output?

I have two polygon layers which I want to union. One layer (1) is just one big feature, the other (2) contains 250’000+ features. Layer 1 was created this way: Several polygons --> fix geometry --&...
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3 answers
58 views

Eliminate polygons using attributes in ArcGIS Pro

I've done an intersect of two polygon feature classes: one of neighborhoods and one with census block groups. I'm now trying to figure out how to merge the polygons smaller than a certain area with ...
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1 vote
1 answer
168 views

GeoPandas Eliminate polygons (select by attribute)

I have a large GeoDataFrame with over 1 million polygons. Many of these polygons are of a small size and I want to merge them to one of the neighboring polygons (to the one with the greater area). I ...
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5 votes
5 answers
271 views

Merging polygons only if three or more are on top of each other in QGIS

I am working on a layer with many polygons (circles). I would like to create a polygon containing only the areas where 3 or more circles overlap (in my example there would be only 1 area in the east). ...
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  • 51
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0 answers
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Exporting joined attribute table features gives wrong number of records using ArcMap

I work in ArcMap 10.8.1. I have a feature class of ~40k records of road segments. I dissolved the segments using a field containing numbername of the roads. This created a feature class of ~10k ...
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3 votes
1 answer
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GeoPandas gaps after dissolve

I have a GeoDataFrame and I use dissolve to remove polygon boundaries. forests_dis = forests.dissolve(by='Forest').explode() But there are gaps in the output (black lines). If I zoom a lot, then I ...
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8 votes
3 answers
465 views

Dissolving polygons contained within the same larger polygon in QGIS

There is a layer in QGIS that contains multiple polygons, and I want to dissolve the polygons which are inside another polygon. I don't want to dissolve the entire layer of polygons. For example, in ...
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2 votes
0 answers
37 views

Dissolving polygons within another polygon in QGIS

I have multiple pixels in a shapefile 'delete_pixels.shp' that are within a different polygon 'delete_id.shp'. I would like to dissolve the pixels that are within the polygons of 'delete_id.shp'. ...
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3 votes
2 answers
81 views

Dissolving isochrones from point layer in QGIS

I have created a set of isochrones (3, 5, 10 minute walk times) from a point layer. I now want to dissolve the layer to make it more readable. However when I try to dissolve based on the field that ...
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  • 51
1 vote
1 answer
143 views

Turf.js dissolve features not adding to Leaflet map

Trying to dissolve features with boundaries that touch with Turf.js. They all have a common attribute that is specific in the Turf option example. Console loge console.log(regionsDissolved) results in ...
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1 vote
0 answers
19 views

ArcMap adjacency dissolve question - based on missing data in YR field

In my polygon shapefile, that was provided by a govt agency, there are thousands of records with DATAYR=0 which is entry error. How do I dissolve/merge/union (doesn’t matter which operation) where ...
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2 votes
1 answer
178 views

Dissolving/merging overlapping polygons in shapefile but retaining a list of original attribute values in Python/GeoPandas

I am looking for an answer to this question, for overlapping polygons, but in Python and preferably with GeoPandas. Background I have files with up to 90'000 polygons, see Tab. 1 in the Minial Working ...
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1 vote
1 answer
54 views

Merging touching polygons in same layer using ArcMap [duplicate]

I have a shapefile consisting of many polygons, and I would like to merge them when they touch each other (see red lines below). I've been trying quite a few tools in ArcMap 10.7 such as Dissolve, ...
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7 votes
2 answers
222 views

Dissolving polygons that intersects in QGIS

I want to gather all the polygons in my shapefile that intersects with each other in several groups. If they had shared a common field I would have used the "Dissolve" tool but they don't ...
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1 answer
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Merging shapefile with respect to attribute using ArcMap or ModelBuilder

I have road vector file with duplicate names (3000 + entries). I want to merge them as per their name so single feature appears against one road name. How to do it in ArcMap 10.5 or with ModelBuilder?
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3 votes
2 answers
166 views

Dissolving selected geometries in-place using PyQGIS [closed]

I have line features and want dissolve selected feature those are connected to each other. I tried Dissolve algorithm. It will create the separate memory layer but need to update the existing ...
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1 vote
0 answers
33 views

QGIS using model inputs and calculated attributes together in a model algorithm

Using QGIS 3.20.2 in the Processing Modeler I would like to use multiple fields as inputs in a dialogue box. One of those fields is calculated in a previous step. The other field is specified as an ...
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2 votes
2 answers
93 views

Dissolving linestrings by uniqe value in field using QGIS

I want to dissolve a line geometry by a unique value in the field "RoutenIDs". For example dissolve line 37 to 43 with value 27. Dissolve line 37-46 ... with value 1999 and so on. Is there a ...
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6 votes
2 answers
235 views

Dissolving multiple overlapping ring buffers in QGIS

I am creating multiple ring buffers around polygon areas of interests. Due to their proximity, some of these are overlapping. I would like to dissolve them into joined features. I have tried dissolve ...
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0 votes
0 answers
98 views

Merging overlapping lines while preserving multiple attributes using ArcGIS Pro

I am using ArcGIS Pro and trying to work out a problem for a field project I've been a part of that goes a step beyond a simple dissolve or merge of overlapping lines. For context: The project entails ...
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0 votes
1 answer
99 views

Dissolving large shapefiles of protected areas in R

My overall aim is to measure the number of GPS points that overlap with protected areas. I am using the protected planet database to source my shapefiles for Ireland and the UK. I don't need any ...
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3 votes
1 answer
329 views

Dissolving overlapping polygons without common attribute in QGIS [duplicate]

In QGIS 3.20 I have clusters of overlapping polygons as shown in the image below: My requirement is to dissolve each of these clusters into single polygons. While the "Dissolve" tool ...
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  • 573
0 votes
1 answer
59 views

How to Dissolve by any attribute in geotools

Just like in ArcGIS we have dissolve option by any field. How can we do the same operation using GeoTools/JTS on any attribute.
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1 vote
1 answer
41 views

QGIS attribute table not dissolving records

So I have a filtered shapefile layer with only 2 records: I use dissolve tool, selecting all fields, since I have tried different combinations Yet, final attribute table of dissolved image still ...
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1 vote
1 answer
119 views

Wrong features when exporting vectorized raster data to a file using GeoPandas after applying a filter and a dissolve operation

I have a raster file with black areas having a value of 0 and white areas having a value of 1, resulting from a visibility analysis: I vectorized this raster after loading it with rasterio: import ...
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1 vote
1 answer
101 views

How to conditionally dissolve a vectorized layer?

I have a raster layer with the day of the year on which we observe temperature above 15 degrees. There are large differences (image below): I have vectorized this layer based on the Band including ...
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2 votes
2 answers
87 views

Dissolving joining lines in QGIS [closed]

I dissolve lines with the same attributes. However, if these lines join, they cannot be dissolved. How can it be done?
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  • 405
2 votes
0 answers
65 views

QGIS dissolving lines

I have a line (pipe) network. Based on 3 attributes (material, dimension, location-street) I created new attribute with the same material, dimension and location. Now I want to dissolve the network ...
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  • 405
1 vote
1 answer
110 views

Dissolving polygons based on data values in GeoPandas

I have a long list of polygons in the GeoPandas GeoDataFrame (Sample below) Index zone_name value geometry 0 A 100 POLYGON ((77.47638480859382 13.05584728590942, 77....
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1 vote
1 answer
26 views

Remove polygon outlines from unified polygons

I have a shapefile consisting of Ireland District Electoral Areas (DEA), in which there are over 3000 polygons. Secondly, I have a shapefile consisting of the Land Use classifications in Ireland. A ...
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5 votes
2 answers
159 views

Dissolving features with two fields and summing values for third field in QGIS

I'm trying to dissolve the fields "Inundation" and "EVC_BCS" (to get the areas of inundation and non-inundation for each rarity category). When I do the dissolve, I would also like ...
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  • 53
1 vote
1 answer
809 views

AttributeError: 'NoneType' object has no attribute 'parameterDefinitions'

I'm trying write simple code line in PyQgis in PyCharm, have already set environment in PyCharm and seems to be working fine because I can iterate through f.i fields in vector layer proceed with ...
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1 vote
1 answer
24 views

Dissolving point files by shapefile boundaries

I have a point-data file representing polling booth locations which each contain information pertaining to the vote for a political party that was recorded at each poll. Underlying this file is a ...
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5 votes
1 answer
86 views

Remove all but one lines in cluster of parallel lines

I just want one line that represents the centroid of a bunch of parallel lines, which one in each bunch doesn't matter. I've already tried doing a dissolve operation to make one thick line that ...
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