Questions tagged [dissolve]

To merge features based on specified attributes.

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Using GeoServer WPS Dissolve function [closed]

How do I dissolve features by fields and get the centroid of the dissolved features from the GeoServer WPS function? I have tried with different geometry processes but none are coming closer to ...
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21 views

QGIS Dissolve/merge features that overlap

I have a vector layer that I created through classifying an image, isolating a specific class (raster calculator), polygonize, and then created a buffer. I am trying to merge/dissolve/union the ...
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Merge Divided Roads

'Merge Divided Roads' question--how does it determine if roads are sufficiently parallel to be merged? I have a couple of road couplets (2 parallel roads, a block apart), within the merge distance (...
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19 views

Dissolve feature in geopandas based on multiple attributes

It is possible to dissolve features in GeoPandas based on the attribute field. However, I would like to know how to dissolve features in GeoPandas using at least two attribute fields. Is it possible ...
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19 views

QGIS: dissolve with statistics (summarize) for several attribute fields in graphical modeler

I'm trying to dissolve a shapefile by one attribute field "HYBAS_ID" and I need the other fields to be summarized simultaneously. I've worked a lot with ArcGis and the dissolve tool there ...
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65 views

How to use dissolve a subset of a PostGIS table based on a value in a column

I have a spatial table in PostGIS that has millions of land parcels. The parcels have ownership information and also a column that specifies whether the parcel is private or public. I would like to ...
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1answer
38 views

Equivalent of “Dissolve with stat” in QGIS graphical modeler

I'm trying to sum multiple variables by categories (id of my polygons) within a QGIS model but I haven't found a proper way to do that... If I hadn't to use the graphical modeler I would obviously ...
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20 views

quick way to create new dissolved polygon from selected polygons (QGIS Actions)

Is there a quick way to create a new polygon from selected polygons (dissolve)? I have 2 or more single polygons from which I want to create a new dissolved polygon within the same layer in one or ...
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1answer
19 views

Connecting output as input in ModelBuilder of ArcGIS Pro

I want to use the output of the the merge function to be the input for the dissolve function and further on for the spatial join function. However, it is only possible to use as a precondition. I want ...
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2answers
41 views

Buffer and Dissolve/Union 2 million points

I'm looking for a solution that will let me add a 100m buffer around 2 million points and then dissolve/union that output into a single multipart polygon. On a much smaller scale (100 points) using R ...
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GeoProcessor Dissolve problem with java

I used to write a dissolve method with C#, it worked well. But, when I try to rewrite it by java, the problem came. That's the code: IGpValueTableObject pObject = new GpValueTableObject(); ...
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Creating list of wetlands with concatenation of unique ids

I am trying to create a table of wetland types per road segment with a field containing concatenation of unique IDs of each wetland type. The source table looks like this: I would like a result that ...
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Dissolve: Statistics type “most frequent” value of dissolved Polygons

I want to aggregate my features which share a common boundary in ArcGIS. This is easily done using the Dissolve Tool in ArcGIS. However, I want to have the attributes of the dissolved polygon based on ...
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1answer
31 views

Getting the right attribute values using Dissolve in QGIS

I have a layer with polygon features with attribute ZIPcode and attribute A. The attribute A can has the value X or NULL. So there is only one distinct value in the dissolved polygons. How can I ...
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1answer
27 views

Dissolve ArcGIS Pro Python doesn't take string variable for field list

I try to dissolve layer having multiple fields statistics calculated. I prepared a string variable which has all the information in it. When I paste printed variable into dissolve it works. However I'...
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ArcPy dissolve field changes output field name pattern

I am using the Dissolve tool to summarize two point feature classes (item in list). The general pattern of the fields within each item are: rankx_dest rankx_length rankx_cost e.g., rank1_dest field. ...
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20 views

Create a polygon from a line layer [duplicate]

I am using QGIS 2.14. I am trying to create a polygon from a line layer(roads) so that I can clip layers within that area, but my output layer will not clip any other layer only the roads it lies ...
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1answer
24 views

Dissolved area of polygons using the gArea function of rgeos?

I am taking occurrence point data (in the form of individual Lat/Long points), and adding a 1km buffer around them using gBuffer() in R package rgeos. I'm then using the function gArea() to calculate ...
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1answer
173 views

Dissolving using Python in QGIS 3

I'm trying to automate a procedure which involves a Dissolve. I've got the layer stored as a variable (layer_shp) and am trying to dissolve it through Python, as such: dissolve_process = processing....
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25 views

QGIS - merge overlapping polygons based on attributes while retaining attributes of one of them

This question seems simple, but I cannot figure it out. The problem is - I have a layer of polygons with animal species habitats. Different species can occupy overlapping or even THE SAME area, but ...
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1answer
48 views

Select multiple fields in Modelbuilder

I am trying to make a model in the Processing Modeler of QGIS. I need a step where a layer with polygons is dissolved based on two fields. At the moment I do this manually. When I open the dissolve ...
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1answer
131 views

Dissolve polygon by attribute or featurecollection by property in Google Earth Engine?

I would like to dissolve a polygon/featurecollection in GEE to run some statistics by the country level. I have tried union and dissolve and cannot find a solution. Union dissolves everything to get ...
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1answer
29 views

Aggregating administrative boundaries using ArcMap

I am working with a shapefile with polygons at the state level which I am grouping using the dissolve tool. How can I save the resulting layers produced from the several dissolve output layers into ...
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1answer
32 views

Summarizing individual data in table using ArcGIS Pro

I am attempting to summarize a a bunch of individual rows in a table I added into ArcGIS Pro, and I'm wondering if there is any type of tool or work flow I could use to do so? This is kind of a ...
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52 views

Dissolving by common name and boundaries using ArcMap

I am looking for a way to merge or dissolve polygons from the same shapefile that both share a common attribute (in this case, owner name) and area adjacent to each other/share a common border. Just ...
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1answer
181 views

Dissolving/merging polygons taking into account area of intersection

How in QGIS do I dissolve/merge polygons taking into account the area of intersection? For example, if area of intersection less then 15% of polygon area then operation should't apply.
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1answer
278 views

Union polygons in Google Earth Engine

I am trying to compare the NDVI-values of different land cover classes over a certain time period and display it in a chart. So in a first step, I'd like to extract the crop land cover and use its ...
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75 views

Converting a Raster to Polygon and Dissolving Issues using ArcMap 10.5

I have a large forest habitat raster dataset (several watersheds in state of Oregon) that I need to convert into a shapefile. The raster has 70 different categories of habitat types. Steps: I've ...
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1answer
80 views

How to explode geometry in PostGIS?

I have got two geometries one is polygons (postcode boundaries) and second is linestring (roads). I want to intersect them together and want roads that are intersecting the polygons. While doing this ...
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30 views

How to dissolve a subset of a multipolygon vector in QGIS? [duplicate]

I have a multipolygon layer. Some of the polygons within the layer overlap. I would like to dissolve only the polygons which overlap and not any discrete polygons. Is this possible? I am currently ...
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1answer
59 views

Summarizing Attribute Table Based on Condition

I have a one-to-many joined table (i.e. duplicated AssetIDs with other different attributes), and I would like to consolidate the table (20 records) into one single record. However, when using ...
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1answer
32 views

Merging two records together after Dissolve to get total number for combining both records using ArcMap

In ArcMap, I have two records for Eastbound ridership and Westbound ridership on a segment. I got this by dissolving according to the segment's unique ID. I'm left over with the 2 records showing EB ...
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96 views

Layer from PostGIS view with dissolve slower than without in GeoServer

I created a view of a table containing line segments, where many lines may be part of the same project (and not necessarily adjacent) in PostgresSQL/PostGIS. The segments are joined to another table ...
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89 views

Creating a dissolved buffer layer in PostgreSQL/PostGIS

I have got a MultiPolygons layer to which I want to create 10 meter buffer around and then dissolve. All data are having SRID 4326. I am new to PostgreSQL/PostGIS. I am drifting around the ST_Buffer ...
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1answer
70 views

Collecting Geometries using ArcMap

Objective: Convert different single part features with same attribute in a field (say 'Country') to a single multipart feature while retaining original geometries. I have been looking for an ArcMap ...
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2answers
105 views

How to merge overlap polygon respectively in one shapefile in QGIS

I want to merge the polygons of one shapefile if they overlap, but I don't know what to do. I try'dissolve' but get only one final polygon. This is not what I need. I want to merge them respectively.
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Creating unique points at the start of multipart polylines in ArcGIS Pro

I have polylines from a network analysis representing public transport trips. These are multipart polylines. I need to identify the starting point for each trip. However, using vertices to points to ...
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2answers
102 views

Dissolving layer with two or more fields in QGIS 3

I want to dissolve the layer based on two or more fields through "Processing modeler". How to set and where to set those fields? When I use "Dissolve" tool separately I can choose fields that I want, ...
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43 views

ESRI Geometry Union slower than Built in dissolve which is slower than Shapely

I work with point datasets a lot. We try to keep a running layer of points and update the dataset with new points while removing the old points. So, we do a lot of checking the extents of the new ...
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1answer
44 views

Dissolve has one county outline

I'm new to QGIS and I'm trying to create a statewide map using specific regions, which break down by county. The steps I'm using are: Vector Geometry: Fix geometries Vector Geometry: Delete holes ...
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29 views

Adding attributes from surrounding feature (exclave problem)?

Here is the problem: I am creating polygons based on the result of closest facility tool in Arcmap. Polygons consist of municipalities with the same closest hospital (impedance is a travel time, not ...
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2answers
84 views

Merge polygons based on Field A or Field B

I have a parcel layer I need to dissolve based on Owner OR Postal Address. I know I can always dissolve based on Owner AND Postal Address, but that is not what I need. So if: owners are different ...
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1answer
578 views

How to dissolve overlapping polygons using GeoPandas

Assuming the following: from shapely.affinity import translate from shapely.geometry import Polygon import geopandas p0 = Polygon( [(0,0), (2,0), (2,2), (0,2)] ) p1 = translate(p0, xoff=1) p2 = ...
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53 views

Use of QGIS/GRASS/SAGA procedures on Geometry Generator

Im new at QGIS, started 2 weeks ago. I'm trying to automatize the display of a map and get rid of some "duplicated" layers and all the extra work. I need to know if SAGA's dissolve can be used in the ...
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1answer
48 views

Calculating field while dissolving

I have two polygon Layers, A and B correspondingly. The polygons of B are lying on top of layer A and also overlapping the polygons of A (I made an example of the attribute table for better ...
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44 views

GeoPandas Dissolve splits polygons into parallel strips?

I have polygons that is converted from raster dataset with Raster Pixels to Polygons in QGIS. I would like select some polygons based on the attribute value and merge them using Dissolve function in ...
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60 views

Merging adjacent polygons using Geopandas by avoiding filling gaps

I have raster dataset that I would like to convert into vector polygons. Raster to polygon conversion works pretty good. But, having problem when I try to merge adjacent polygons using Dissolve ...
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65 views

Preventing gaps on polygon shapefile being filled automatically when exporting from QGIS?

I classified raster dataset and converted raster dataset into polygon shapefile, then merged adjacent grid polygons using QGIS Dissolve function (figure 1) creating a temporary file. However, when I ...
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88 views

Dissolve output not dissolved in ArcMap?

Even though polygons of an input feature have the same attributes/dissolve fields, the output does look like in the picture below. Does anybody know what the problem is? This problem occurs only in ...
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1answer
188 views

Selecting which polygon's attributes to keep after dissolve

I have two polygons, after doing a dissolve I can't choose which polygon's attributes the new dissolved polygon will have. I tried to find a pattern by checking if the bigger's polygon attributes are ...

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