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Questions tagged [dissolve]

To merge features based on specified attributes.

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2answers
29 views

Dissolve everything except for one particular polygon

I want to dissolve these polygons (column FIRST_N03_003) except for FID 34 and 77. Essentially, the 003 column is the state, and the 004 column is the city, but some cities are independent and do not ...
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0answers
62 views

QGIS: Dissolving Polygons with Self-Intersection

I have created multiple polygons with some subset of track-lines, with the order of time those points were recorded. Therefore some of the polygons have self-intersection within the polygon. Is there ...
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0answers
32 views

Promoting to multipart using PyQGIS?

I am creating a code that aggregates neighbouring polygons if they have similar value on the field 'DN' and if they are closer than 50 m.Then I want to iterate this 3 times. I could already get the ...
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1answer
45 views

Dissolving using PyQGIS?

I have trouble to use function dissolve to dissolve polygons by field value in PyQGIS3. In PyQGIS2 this line was doing the job: QgsGeometryAnalyzer().dissolve(ki, "name.shp", onlySelectedFeatures=...
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1answer
47 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 ...
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0answers
82 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 ...
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3answers
64 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 ...
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0answers
85 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 ...
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1answer
35 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. ...
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1answer
34 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
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1answer
56 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
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1answer
81 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 ...
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0answers
21 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 ...
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0answers
119 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/...
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0answers
24 views

Calculating total utility number of each road segment using ArcGIS Pro?

The problem I want to solve is to calculate total number of main utilities (parallel to roads) within a distance (e.g. 10m) of each road segment in ArcGIS Pro. First I applied a 10 m buffer to roads ...
2
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1answer
63 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
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1answer
26 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
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1answer
88 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
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2answers
173 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
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1answer
75 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 ...
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0answers
46 views

Join line segments with same attribute

I am using QGIS 3. I have a road network where the same road name e.g. high street may be made up of several lines and I need to consider there are many main streets across various towns. I want to ...
4
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0answers
106 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
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2answers
143 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
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1answer
38 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
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1answer
96 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 ...
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1answer
90 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 ...
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0answers
31 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
20 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
29 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
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1answer
299 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 ...
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1answer
93 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
47 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
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1answer
67 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 ...
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1answer
258 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
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1answer
79 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 ...
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0answers
25 views

Get rid of line inside polygon after merge [duplicate]

I am a GIS beginner and looking for a solution to make one big polygon for the country Russia. I have a shapefile of Russia and it is, because of the coordinate system, split in two parts at +/-180 ...
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0answers
40 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: ...
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2answers
110 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
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1answer
39 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 ...
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1answer
43 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
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1answer
27 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.
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0answers
20 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: # ...
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0answers
70 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 ...
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0answers
78 views

While executing Catchment Polygon Processing from Catchment Grid an Error HRESULT E_FAIL and ERROR 999999 occurred. How can I resolve it?

I am delineating a watershed, but after doing the catchment grid in terrain processing, I started to do catchment polygon processing, but I couldn't, because of an error. i have tried several times ...
1
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1answer
187 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 ...
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0answers
56 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'...
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3answers
278 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 ...
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0answers
77 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 ...
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1answer
51 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 ...
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0answers
31 views

How to connect a point- and a line-shape to only one layer? (QGis)

I am just working on a project in which I try to realize the presentation of streets (line-shape) in connection with some points of interest (point-shape) on these streets. At the moment it works ...