Questions tagged [dissolve]
To merge features based on specified attributes.
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11 views
Dissolve on attribute field and location?
I've got a county parcel shapefile and I'm wanting to find all the properties over 300 acres. When I dissolve based on ownership and search for dissolved properties that sum over 300 acres, some of ...
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1answer
62 views
Dissolving polygons to single part features with Python (shapely and fiona)?
I used the code from Dissolving polygons based on multiple attributes with Python (shapely and fiona)? to dissolve a shapefile using shapely and fiona. However the output creates multi-part geometries....
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1answer
31 views
Filter options are not saving in Dissolve algorithm window through Graphical modeler in QGIS 2
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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18 views
How to remove artifacts with SQL Server GEOMETRTY::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 ...
4
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1answer
56 views
Using Dissolve and Multipart to Singlepart in QGIS?
I started with a network of polylines.
In QGIS I used dissolve to 'merge' all lines according to an attribute value. This did exactly that, but included non-connecting lines which I don't want. I ...
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1answer
68 views
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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0answers
20 views
Dissolving GeoJSON with nodes and lines to one average line?
I have a GeoJSON with two layers. One with lines and one with nodes. I'd like to dissolve it (or at least the layer with the nodes) to one single line, by averaging the positions.
I've looked at Turf....
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1answer
46 views
Dissolving featurecollection in google earth engine?
Here is the link to my GEE code:
https://code.earthengine.google.com/99b494aacf00df398e0e710ec02c13e8
Here is the code (DMDP is an asset and to see it please follow the link):
Map.centerObject(...
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1answer
30 views
Mapping Commuting Zones from Counties for US 1990 Data in ArcMap?
This question follows Seeking 1990 US Commuting Zone shapefiles?
I am attempting to map US commuting zones as defined in 1990. I have successfully mapped counties from a county shapefile obtained ...
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1answer
30 views
QGIS: Dissolve after raster-to-polygon not working correctly, only dissolving a portion of the vector layer
I am working with QGIS and am trying to convert a raster layer into a vector layer. I have converted it to a polygon from raster (image below), and then wish to dissolve this polygon into a single ...
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2answers
34 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
89 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
42 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
107 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=...
3
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1answer
59 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
104 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
69 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
163 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
38 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
54 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
57 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
136 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
30 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
211 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
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1answer
80 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 ...
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1answer
29 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
155 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
355 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
76 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 ...
0
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0answers
49 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
votes
0answers
140 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
188 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
43 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
117 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
136 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
35 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
31 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 ...
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1answer
406 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
174 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
49 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
78 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
votes
1answer
410 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 ...
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vote
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
44 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:
...
4
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2answers
146 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
40 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
47 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
31 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.
