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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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