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Questions tagged [dissolve]

To merge features based on specified attributes.

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votes
1answer
110 views

Dissolve lines putting segments out of order QGIS

I'm using a polyline river layer in QGIS to calculate river miles, but am ending up with points out of order. Starting with a river layer that is broken into reaches (short sections), I'm dissolving ...
2
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0answers
187 views

Is PostGIS faster than Shapely [closed]

I've recently tried using Shapely to dissolve and intersect large sets of 100'000+ geometries, some of them quite complex. This would take me at least one hour, at which point I would usually shut the ...
3
votes
3answers
76 views

Dissolving polygons when only relationship is spatial location?

I have a feature class with parcel information; some of the parcels have roads included while others do not. When a parcel has a road included there is always a matching parcel without the road ...
2
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0answers
383 views

Dissolving large sets of polygons [closed]

We have many datasets, each containing about 150'000 polygons. We would like to dissolve each dataset down to about 2500 polygons, based on a given attribute. We've successfully done this using the ...
-1
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1answer
44 views

Buffer all polygon feature classes inside geodatabase using ArcGIS 10.4

I have a geodatabase which contain a hundred of separated polygon feature classes. I want to create a same value buffer of all feature classes in same time. Each buffer must have a "dissolve" option. ...
1
vote
1answer
143 views

Merge many objects with equal position while sum up their attribute values in QGIS

I´m looking for a smart way to merge multiple line objects with the same geometry and same position in one layer while also sum up their attribute values. The result should be only one geometry (...
1
vote
1answer
64 views

Dissolve polygons based on number of polygons

How can I dissolve group of polygons into many polygons based on specific number? For example I have 100 points which are beside each other I need to dissolve each nearest 5 polygons into 1.
2
votes
1answer
358 views

Dissolve using attribute field and area

How can I dissolve a shapefile with polygons and keep the information of the polygons that have the bigger area in QGIS? example: two polygons with the same field values but one of them is bigger ...
1
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0answers
40 views

Summarize table by group and add logic to keep data

I need to dissolve a polygon layer by group but, at the same time, I need to keep some of the data in extra columns. This is the diagram: This is the logic for the new group: Cod = "Cod" where N1 ...
1
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0answers
275 views

Dissolve with stats plugin does not appear in QGIS 3.0

So far we have tried to: find it in the plugin repository from QGIS, with no luck. install the plugin downloading it from the web QGIS Python Plugins Repository: https://plugins.qgis.org/plugins/...
2
votes
1answer
108 views

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 ...
1
vote
1answer
37 views

Using Dissolve Tool in ArcGIS Desktop?

I am using ArcGIS Desktop 10.4.1 and trying to create a mailing list using parcel data. I need the parcel lines to be dissolved if they have the same owner name and are adjacent or adjoining. ...
2
votes
1answer
495 views

Dissolve not based on attribute in GeoPandas?

I would like to dissolve a shapefile regardless of attribute content using geopandas. The regular dissolve can be accomplished with something like this: import geopandas all = geopandas.read_file(...
2
votes
2answers
703 views

QGIS. Dissolve polygons to create new layer with stats. Not working

I'm using QGIS 3.2.1 (Bonn) I'm trying to dissolve and create statistics from a group of polygons, but QGIS is not making it. I do not know if I'm missing something or the software has a bug. These ...
2
votes
1answer
79 views

Dissolving feature/field by interval using ArcGIS Desktop?

I have a huge dataset with flowpaths containing a catchment area for each line. The attribute table has ~ 780.000 rows, and thereby 780.000 features in the mapwindow. Is it possible by using a field ...
7
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0answers
215 views

How do I select the longest connected lines from PostGIS ST_ApproximateMedialAxis?

I used PostGIS ST_ApproximateMedialAxis to transform polygons representing mountain ranges into a series of lines. Now, I'd like to select only the "longest" line segment for each group, so that I ...
2
votes
2answers
396 views

How to polygonise a large and detailed raster into a single valid polygon with QGIS?

I am doing research on the protected areas of the Amazon rainforest and I need to create a single polygon layer that has all the forested non-protected areas in one attribute row. I have tried using ...
2
votes
1answer
47 views

Merge/Dissolve Polygon overlapping within

I have a polygon that has been broken down to an intersecting analysis point. Each segment has its own acreage within an acre field on the attribute table. I want the intersecting lines to be removed ...
4
votes
1answer
185 views

QChainage doesn't place points evenly along dissolved lines

I am trying to add mile markers to interstate centerline data. I've tried both the native dissolve tool (which freezes QGis) and SAGA line dissolve to create one continuous line. When I run the ...
0
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1answer
231 views

Dissolve/merge polygons using ST_Union in CARTO

I am attempting to dissolve the boundaries between several polygons using a common attribute within a column in CARTO and the ST_Union function. In my scenario, I have created a table for all US Zip ...
2
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0answers
50 views

Arcpy Dissolve creating grid that is not produced when run manually via ArcMap

Software: ArcMap 10.5.1, ArcPy I have created 2 python scripts that seeks to create a floodplain polygon from a DEM. py1 is DEM to Polygon while py2 cleans polygon to create final output. In py2 ...
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0answers
21 views

Merging lots of small portions of line to longer adjacent lines using ArcMap?

I have a hydrologic system split into 100 meter segments which is what I'm looking for, but I also have a lot of very small segments all over my system. Is it possible to dissolve/merge those small ...
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0answers
52 views

Error message using dissolve

I'm trying to dissolve an hydrologic system because I have to many small portions for what I want to do but I can't figure how to make dissolve work ... the shapefile I'm using is a merge of different ...
1
vote
1answer
690 views

No Shapely geometry can be created from null value during dissolve in Geopandas?

d1= gpd.read_file(aq.shp) asttom = gpd.read_file(es.shp) data2 = d1[d1['TYPE'].str.startswith(('01'))] dslv=data2.dissolve(by='TYPE') While it reaches the dissolve procedure it causes the error. How ...
0
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1answer
440 views

Turn dissolved polygons to singlepart in geopandas?

I have performed a dissolve but I want to turn it to singlepart.I have searched in the docs but haven't seen something that does it. What do you think? Actually, I want to make it singlepart and then ...
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0answers
50 views

Merging small lines to form longer line in ArcGIS Desktop?

I'm having some trouble with the dissolve tool in arcgis. I have a stream network that has some streams made up of a number of little segment that I would like to transform so that all the stream ...
3
votes
1answer
132 views

Dissolving lines with same directions using ArcGIS Desktop?

I have a feature class containing road polylines which has to be dissolved by some fields. But recently noticed that if some road has same atrtributes but different directions, Dissolve tool doesn't ...
0
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1answer
816 views

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 ...
1
vote
1answer
80 views

Concentrating multiple polygons

I have yield data of a field. The final data are represented by quarter million of polygons. The width of the harvester was 30 ft and it measured and stored the yield data after each 1.2 ft. So, the ...
2
votes
0answers
48 views

Dissolve field while preserving another related field

I am using 'Store' as dissolve field and 'Profit' as statistics field with statistic type 'MAX', and would like to preserve the related 'Fruit'. This is my original table: ...
5
votes
2answers
211 views

Usage of QGIS Dissolve geoalgorithm in QGIS Graphical Modeler (2.18.19 LTR)

When I use QGIS Dissolve geoalgorithm as a standalone tool from the Processing Toolbox, the GUI looks like shown below. By selecting the Input layer I am able to chose from its attributes on wich to ...
3
votes
1answer
44 views

Combine information from spatial join

I performed a spatial join based on point features that fell within polygons of interest. I now want to combine these features by polygon (field ID) and create a new field that combines information ...
0
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1answer
49 views

Combining two layers and removing their overlap using ArcGIS Desktop?

I am using ArcGIS Desktop 10.0. I have two polygon layers showing storm surge and I want them both to be combined to look like a smooth transition into each other. However, they have an overlap and ...
1
vote
1answer
50 views

Is there a way to do a visual spatial dissolve of polylines that do not touch each other?

I do not have the common attributes to do a regular dissolve. However I can see which lines are separate from another. Either QGIS or ArcGIS is fine.
0
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0answers
22 views

Out schema for dissolving shapes

I have a code which goes like this with fiona.open(some_file, 'r') as to_dissolve: out = to_dissolve.schema with fiona.open(another_file, 'w', 'ESRI Shapefile', out) as dissolved: # ...
0
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0answers
176 views

Invalid Topology: Cannot Open Cache File when trying to do a dissolve

I'm trying to perform a dissolve to take some data that is at the Census Block level to the County level. I'm dissolving by the County ID and doing a Statistic Field for various attributes (1 SUM, 2 ...
1
vote
1answer
379 views

Dissolving points with multiple attributes in ArcGIS Desktop?

I have a series of GPS points with one ID (Track 1, Track 2, Track 3...) but they also have different fields like elevation. I want to dissolve these GPS points using the ID, retain only 1 point per ...
0
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0answers
122 views

Why Geopandas dissolve failed?

After polygonization of a raster, I would like to dissolve all polygons with same value. So I tried to use : gdf.dissolve(by='column') gdf.dissolve(by='column', aggfunc='first') gdf.dissolve('column'...
1
vote
3answers
652 views

Combine multiple rows in attribute table into one

I'm running into problems while trying to edit some data. I'm trying to merge a number of land-use categories into less categories. So for example I have 5 types of "forest" which I want to merge ...
0
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0answers
126 views

Geoprocessing tools won't work with the WDPA (World Database of Protected Areas) database

I am trying to run spatial stats (% area of overlap of various datasets) with the World Database of Protected Areas marine shapefile. It's a global collection of marine protected areas, so it's a big ...
0
votes
1answer
92 views

Symbology: different ways to display categorised data QGIS 2.16 [closed]

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. I'm seeking advice on ways how to create ...
5
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2answers
2k views

geopandas dissolve overlapping polygons

Goal is to group polygon (1,2,4) and polygon (3) based on overlap. All polygons are part of the same shapefile layer. In ArcMap I can simply do dissolve and uncheck Create multipart features. ...
2
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0answers
193 views

Calculating combined area of multiple polygons by counting overlapping area only once in R?

I'm using a shapefile in which polygons represent the geographic distribution of species. I need to calculate the combined range of several species sets, but the overlapping areas should be counted ...
0
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2answers
536 views

Merging or dissolving points while maintaining attributes using ArcGIS Desktop?

I have a point shapefile with points that have identical geometry but different attributes. I would like to merge the points in the same location, but keep the highest value of the attribute from them....
1
vote
1answer
848 views

Geopandas spatial join result and dissolve by geometry

For my process I make a spatial join between a polygon grid and points : join = gpd.sjoin(rotate_grid, gdf, op='contains') It's look like this. the result is a grid where each square of my grid is ...
2
votes
1answer
214 views

Joining two or more overlapping buffers using MMQgis plugin?

I use MMQgis plugin to create buffers around points. Some of them overlapping and, to my analysis, i have to "dissolve" lines that cross this buffers. I use Vector -> Geoprocess -> Dissolve, and it ...
1
vote
0answers
155 views

Dissolve polygons with road network gaps

I am using QGIS and have a shapefile of the blocks in a large city, where each polygon is a particular streetblock. The city is divided into various sectors, and each block has information on its ...
2
votes
4answers
430 views

Handling large datasets with Erase/Dissolve in ArcGIS (Dissolve alternative?)

I have what should be a simple problem: erase a large multipart polygon layer from a larger polygon (see below for example). However, I believe the Arc Erase tool is trying to erase each part of the ...
3
votes
1answer
950 views

ogr2ogr dissolve shapefile

I am following this question with the first answer Dissolve/aggregate polygons with ogr2ogr or gpc? where I am trying to dissolve my shapefile down to 1 row by the geometry field ogr2ogr C:\Users\...
0
votes
1answer
175 views

Merging adjacent polygons to one which sum of attribute values of adjacent ones is between 1000 and 2000?

I have a huge number of polygons that contain attribute field that represent number of offices inside each polygon. Now I want to merge all adjacent polygons which count (sum) of offices values is ...