Questions tagged [dissolve]
To merge features based on specified attributes.
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Buffer with dissolve - Geopandas - unary_union multipolygon
I am trying to buffer points which are quite close together, and then dissolve the overlapping buffer polygons into larger polygons. After doing the buffer is where I have the issue. I have tried ...
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2
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GeoPandas dissolve using an attribute filter
I am wondering if it is possible in one pass to use GeoPandas' dissolve to merge together only the records matching a query.
Specifically, I have many small areas that should be merged to the larger ...
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Road Connectivity Analysis by field
I'm currently trying to do a connectivity analysis of roads of a specific type. (how far can you get before encountering a dirt road?) Ideally, I want the map to look something like this:
It is ...
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Dissolve spatio temporal data with GeoPandas without missing the temporal part
I am wondering if there's a clever way to use the dissolve() method of GeoPandas with a spatio temporal geodataframe without losing the temporal part.
I have a dataset where for different days of the ...
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Dissolving streets by distance using ArcGIS Desktop
I am using ArcGIS Desktop.
Is there any way to dissolve a streets network to districts based on a distance given?
The streets of the districts must have the same sum of the distance.
example:
The ...
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Why "Unique ID fields" is not saving its value in Dissolve algorithm in Graphical modeler?
I am working on my project in QGIS 2.18 through Graphical modeller and using some basic algorithms for polyline objects.
However, I do not understand why specification for Dissolve algorithm cannot ...
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How to remove artifacts with SQL Server GEOMETRY::UnionAggregate()
We'd like to do an effective "real-time dissolve" on an Esri feature class with a SQL GEOMETRY shape where a parcel layer is "dissolved" into products using an attribute (ProductID) of the parcel ...
CommunityBot
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Dissolve shapefile polygons on SQL Management Studio 18
This is the first time I am trying to work with a shapefile on SQL and I am a little lost.
I uploaded a shapefile with all the counties of the US and what I am trying to do is to dissolve all ...
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3
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1
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Selecting multiple fields in QGIS Modeler
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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2
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Merging/Dissolving polygons with same attributes
I'm interested in the areas of my investigation area where the slope is smaller than 25%. For this, I used elevation raster data SRTM 90m Digital Elevation Database v4.1 from CGIAR-CSI (http://srtm....
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How to iterate through various layers and export each with an additional word to its file name
I'm batch dissolving some layers in QGIS and want to save each dissolved shapefile as <layername>_dissolved.shp. I'm using a for-loop but it just shows raise QgsProcessingException(msg) _core....
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Dissolve FeatureCollection using attribute
I have a feature collection with a number of properties, all numbers. I want to aggregate all features in the collection that have a property in common. For instance, I want to merge features that ...
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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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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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How to include non aggregate columns in select function if not including them in aggregate function (like GROUP BY) in PostGIS table
I have a property parcel table a in PostGIS that has the following columns/fields
owner_name,
owner_city,
county_name,
state,
owner_address,
owner_mailing_address
I want to dissolve/aggregate the ...
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Dissolving polygons on distance condition using PostGIS?
I'm tying to group some polygons in same layer, on geometry & attribute conditions: within 0.8m from each other and with same value in a column.
With answers I've found here I've got something ...
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How to stylize polygons sharing the same attributes to represent a common outline
In QGIS 3.14.16, I want to outline multiple polygons which share same attribute value.
Styling the layer with the same attribute value bring the following result:
The style I wish to have is:
I ...
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3
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Avoiding/getting rid of topological errors after dissolve?
After dissolving a layer in QGIS 2.8, I get a lot of topological errors in the new (dissolved) layer. Any suggestions as to how to get rid of these errors without manually editing each one?
update:
...
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1
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Dissolve with stats in Python for QGIS
I’m using QGIS 3.10, PostgreSQL 10 and PostGIS 2.5. I want to dissolve within a Python script a shapefile so that the result is dissolved by one field and the number of different values of another ...
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2
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Using newly created features in next part of script using ArcPy
I am trying to write a python script which buffers a large number of features from a geodatabase (but not all) and then dissolves the newly created buffer shapefiles together. Currently I have only ...
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3
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How to Aggregate and dissolve MySQL geometry
On CentOS, I have a MySQL 5 database with a MyISAM table that has a geometry column with a spatial index, containing US county boundaries.
Trying to combine/aggregate/dissolve some of these into as ...
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Calculating total area of three partially overlapping polygons (without counting area of overlap more than once) using ArcMap
I want to calculate the area of three 1 km buffers without counting the area of overlap more than once. I have used the merge tool to combined the three polygons and then I have used the dissolve tool....
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Dissolve of polygons leaving internal lines
I have been trying to produce an outline of a stylised island using dissolve however there are internal "lines" that remain after I use dissolve?
The hexagons that are being merged were ...
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Scratch file used for Merge step in ArcGIS (10.3.1) Model does not keep all fields of input files
I am using a nested model to merge a large number of Shapefiles, then dissolving them based on a specific attribute. The solution to this was outlined in another question (Dissolving shapefile but ...
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Applying geometric operation on multiple GeoDataFrames
I have a collection of geodataframes in my Python environment. How can I apply for each GeoDataFrame the same spatial operation using following manner and create a new variable with the reference that ...
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For some reason one polygon in a shapefile is hidden behind another. How to solve this?
In this photo, you can see that Great Brittain consists of two features. London and the rest.
Problem is that London doesn't show as a separate colour. When I select great brittain, the area where ...
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Displaying categorised data using QGIS [closed]
I am using QGIS 2.16.
I have a database of 100 entries which has been categorised using a column of data that has 20 categories which essentially breaks up my map into 20 regions.
How do I create an ...
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Dissolve in ArcMap gives ERROR 999999
The Dissolve tool is not working for me when I use ArcGIS Desktop 10 to dissolve a shapefile.
It says:
ERROR 999999: Error executing function.
It works perfectly when I use version 9.3.
Any help?
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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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2
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Polygons not merging in QGIS when dissolving?
I am new to QGIS and am trying to dissolve polygons in my shapefile using one of the fields in the attribute in QGIS 2.8.5. The process runs, and it does add a new map but nothing seems to have ...
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Merge connected lines and split them after set unequal distances
I need to edit line features in QGIS 3.4.4. I have more than 1000 line features that I want to first merge and then split. The line features describe roads in useless intervals, my goal is to ...
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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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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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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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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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Dissolve using GDAL/OGR?
I'm trying to dissolve a shapefile according to a field using Python 2.7.10 and I don't want to use ArcPy.
Is there any way to do this using GDAL/OGR?
CommunityBot
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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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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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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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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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Why is the Dissolve Tool not working?
I'm still having trouble with the dissolve tool and I've tried all of the solutions offered here including moving the process from the background and repairing the geography. I've also tried amending ...
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Combining adjacent polygons sharing similar trait into single polygon using ArcGIS Desktop?
I have a large dataset of habitat classes which I have further simplified down into my own unique classes.
However, it resulted in there being habitats adjacent to each other with the same forest ...
CommunityBot
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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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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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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 ...
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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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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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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 ...
- 65.1k
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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 ...
- 65.1k