Questions tagged [dissolve]

To merge features based on specified attributes.

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22 views

QGIS dissolve algoritm: how to select multiple field 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
23 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
27 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
19 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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1answer
45 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
172 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
44 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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1answer
35 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
47 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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0answers
29 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
55 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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2answers
85 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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78 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
67 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
54 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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20 views

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
64 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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0answers
37 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
43 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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0answers
28 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
82 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
229 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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0answers
45 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
44 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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0answers
31 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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49 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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0answers
57 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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84 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
145 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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0answers
40 views

Creating shapefile based on map with ArcGIS Desktop?

I'd like to create a shapefile with ArcGIS of the map attached below. Published in an econ paper, the map divides the territory of the German Union (post 1815) in 19 states (more precision can be ...
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2answers
81 views

GeoPandas sjoin with extensive quantities

I have one geodataframe that contains polygons and corresponding land use category (e.g. agricultural, commercial, retail, residential, ...) and another that contains census tract polygons and ...
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0answers
26 views

QGIS dissolve/merge features by all attributes

I have a vector layer with thousands of features and over ten columns (attributes). I would like to dissolve/merge features with identical attribute combinations and keep the attributes. I think it ...
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0answers
50 views

Fill in gaps in QGIS shapes?

So basically, I've written a script that generates a lot of polygons over the UK with certain criteria. The output it a lot of shapes like the following - I wanted to know if, in QGIS, I'm able to ...
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74 views

ogr2ogr sqlite dialect can't find functions

my question might be related to this Dissolve using ogr2ogr gives 'no such function: ST_union' What I am trying is st_unioning my landparcel polygons based on its group. The code is very ...
2
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1answer
182 views

Problems with dissolving layers [QGiS 3.4.1]

I am currently working on a set of data that defines restricted areas for use of photovoltaic modules. This set of data amounts to 270.00 polygons in total [with their own geometry]. For simpler ...
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1answer
76 views

Merging polygons without losing area using ArcGIS Pro?

I have a shapefile with 23 polygons,I want to merge them and get the total area of this big polygon. But when I used "merge"tool, it only merge polygons but area. Any ideas about what I should do?
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38 views

QGIS Dissolve tool erroneously fills rings in polygons

I have a shapefile layer with >27,000 polygons. I want to dissolve these together to create a footprint layer. The Dissolve tool works fairly well, but it has filled in what should be rings in the new ...
1
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1answer
65 views

Regroup multiple polygon with same attributes in one

After looking for an answer on some forums (without success :/) i post here in hope on of you can help me. I have a polygon shapefile with thousands of entities (=row) and >10 attribute column. A ...
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1answer
45 views

Quicker function than dissolve and difference

I'm on QGIS (v. 3.6) trying to create a map of Florida's hydrography using the NHD "Water Areas" shapefile. Methodology is to fix any invalid geometries in the NHD data, dissolve the layer, and then ...
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0answers
121 views

Improving speed of GeoPandas dissolve?

I am trying to dissolve grid spaces by category using GeoPandas' dissolve function, but it doesn't finish after hours of running and I want to make sure I'm not doing something wrong and/or there isn'...
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0answers
199 views

QGIS 2.18.28 Dissolve Error: “-2147483645 See log for more details”

I am doing property research on a county in Texas. I have all the parcel data and am trying to dissolve by Owner Name so that I can use the info tool to quickly see all the properties a given person ...
2
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1answer
52 views

Erasing boundaries between polygons that are next to each other using QGIS?

I have files that representes individual houses and blocks. I want to have a file that represents a residential area in a block. Is there a way to erase the line, boundaries, between polygons that ...
2
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1answer
60 views

QGIS (merging, dissolve, union) lines of same name

I have street data where roads are segmented for no particular reason. I want to merge, dissolve or union whatever seems fit to make a single flat line. I H have tried above processes in QGIS but ...
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0answers
16 views

ArcMap Model with parameters

How do I get the fields from the intersect results in my arcmap model to appear as the possible 'statistics fields' for my dissolve tool when using model parameters? I have the statstics field set up ...
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0answers
100 views

Unary union/Dissolve returns null geometry in QGIS 3

I am writing a python processing script in QGIS 3. In it, I have polygon geometry objects stored in a list polygonGeoms and I want to dissolve all of it into one geometry. However, when calling the ...
2
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1answer
137 views

How to dissolve shared line segments together in QGIS?

I have 2 features which are lines on a single layer re-projected to ESPG:2039. I wish to combine them into one MultiLineString but in a way that their common part is merged to a single LineString. I'...
2
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1answer
34 views

Counting the number of shared point within polygons [closed]

I have a set of points on a map, each with a unique location id, with one or more points within a number of polygons with unique polygon ids. I am trying to associate each location id with the number ...
2
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0answers
115 views

Dissolve Line Strings to one string - “No Shapely geometry can be created from null value”

I have a layer with 7000 LineStrings, all represent bus routes: It seems that all the bus routes are contiguous, but I'm not sure of it. I'm trying to use python shapely to dissolve all those ...
2
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2answers
54 views

Dissolve with common value in a field and not common in another

I have a shapefile in QGIS and I want to dissolve it with the options: A field named 'specialid' has the same value A field named 'city' has different value Ok the first is very easy. It is ...

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