To merge features based on specified attributes.

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117 views

How to dissolve a large number of polygons in QGIS?

I'm trying to do it using the command DISSOLVE but it generates an empty shapefile. My purpose is to dissolve a large number of polygons (about 200,000) into a single multi-polygon...
1
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0answers
78 views

Make “qgis:delaunaytriangulation” and “qgis:dissolve” save their outputs on a specific predefined layer

I'm new to python and QGIS. I'm working on modifying a plugin which runs algorithms "qgis:delaunaytriangulation" and "qgis:dissolve" like so delone_triangles = processing.runalg("qgis:...
2
votes
3answers
98 views

Dissolve without removing interior lines in ArcMap? [duplicate]

I'm fairly new to GIS and I'm having an issue that I hope someone can help me resolve? Basically, what I'm trying to do is merge features based on a single attribute so that my table no longer ...
1
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0answers
190 views

Creating multipart polygons with ArcPy Dissolve? [closed]

I need the functionality of the editor > merge command for use in a python script tool. I realize this function is not directly accessible through ArcPy, but I am hoping someone can help with a work ...
1
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1answer
58 views

combing two layers dissolve and simplify

I am trying to combine a dissolve with a simplify polygon layer I've created. When doing conversion of layer to kml it says I have too many vertices hence the need for simplification. How can this be ...
2
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2answers
341 views

Concatenate fields on a Dissolve

I have a feature class that that I would like to dissolve. Upon the dissolve, I would like to concatenate a comment field, which is a text field. How can I do this? Conceptual idea below:
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1answer
342 views

Remove lines from inside a polygon in QGIS

Through a "dissolve" process in QGIS, I achieved some polygons that have some fails, like this one in the screeshot: Is there any automatic process I can make in QGIS to remove those lines inside ...
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1answer
223 views

Assigning overlapping polygons based on attribute using ArcGIS for Desktop?

I am using ArcGIS 10.1 and have a polygon shapefile with 16000 records. There are many polygons that are overlapping and my goal is to determine the overlap portions fix the problem, so that there ...
2
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1answer
77 views

Dissolving features to only have multiparts when they are within 100 feet of one another

I want to have a selection of parcels that is dissolved by land owner and within 3 miles of a polyline. If the same owner owns parcels on opposite sides of a road (within 100 feet or so), I want the ...
2
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2answers
168 views

Merging lines (that might cross) at common endpoints without multi-part features in the result

I have a polyline dataset I'm trying to merge / dissolve segments based on an attribute into continuous single lines. The problem is that some of those segments cross each other but need to be ...
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3answers
205 views

Processing modeler: how to dissolve a vector layer and sum the attributes

I have a complex workflow prepared in the processing modeler, but I'm missing one step to link all the model. I need to dissolve a polyline vector in a single line vector that has as attribute the ...
1
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2answers
171 views

Topological errors after dissolve - how to avoid/get rid of?

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:...
2
votes
1answer
142 views

QGIS crashing/failing when dissolving multiple shapefiles in a Python loop

I am using QGIS 2.10 (but I've also tried 2.8) to loop through all the shapefiles in a folder (those ending in .shp) and perform a dissolve function on each of them. However, when I run the following ...
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0answers
43 views

How to change the default field names while processing dissolve?

I need Count, Max and Min values when running Dissolve in a model builder. In the resulting tables, the name for the count values are "Value_COUNT", but the names for the max and min values are the ...
2
votes
1answer
133 views

Calculating area using dissolve and merge but getting shapefiles with empty attribute tables in QGIS?

I have a shapefile of a country with the 29 provinces. I also have shapefiles with the areas which are protected from construction (there are 4 categories for protection, within 4 shapefiles. Some of ...
0
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1answer
53 views

Extracting Multi Values to Points and Dissolve afterwards with ModelBuilder?

I want to extract Multi Values from 2 Rasters to Points and dissolve these points afterwards with an ArcGIS ModelBuilder model. In the Dissolve function I want to make some statistics of the extracted ...
2
votes
1answer
849 views

What is FME equivalent to ArcGIS Dissolve?

I am trying to dissolve polygons that are spread out across a region. ArcMap's ModelBuilder will dissolve these polygons into a single, multi-part feature. How can I get FME to do this same thing? I ...
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0answers
68 views

QGIS dissolve by attribute and retain primary polygon attributes

I have a parcel shapefile. Many of the parcels have been combined over time, but the shapefile still represents the original parcel boundaries. The attribute table has a field for the original parcel ...
2
votes
1answer
49 views

Dissolve singlepart features into multipart based on another polygon?

I'm working on generating a water feature layer that eliminates a lot of the swamp/marsh areas in my county. Using raster analysis (iso unsupervised cluster, majority filter, boundary clean, etc) and ...
1
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1answer
108 views

Dissolve Polygons by attribute leaves empty spaces

I am trying to dissolve polygons based on the same attribute using QGIS 2.8.2 (Wien). I use Vector, Geo Processing Tools, Dissolve and then I select the attribute. The data is Postal Sector in Uk and ...
0
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1answer
39 views

Using Dissolve inputs in ModelBuilder

I'm trying to build a model in modelbuilder, and as part of that, I'd like to use the dissolve tool on a feature class created/modified after some previous steps. However, when I try to connect this ...
1
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1answer
43 views

automation help within an attribute table ArcMap 10.3

I have 100+ catchments within a watershed. There are 6 different types of land use classifications within in the watershed. There are 5 different types of soil types within the watershed. My example ...
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1answer
117 views

Script for selective dissolving of multiple features

I am kinda new to Python and arcpy and have done some basic online courses on this. So I do have an idea how these scripts are structured/written and how they work. Now I have to perform a seemingly ...
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1answer
38 views

Tracking Dissolve changes in ArcMap?

How would one to check to see what was dissolved using the Dissolve tool in Arcmap 10.2? Other than manually checking to see what polygons were dissolved by toggling back and forth between the ...
1
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1answer
212 views

How to get a “clean” polygon after using dissolve in QGIS?

I'm trying to obtain the boundaries of shapefile, thus to clean the inside as a matter of speaking. While I had expected that dissolve while get me a proper polygon, unfortunately it still has some ...
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1answer
334 views

ArcGIS Dissolve gives Error 999999 on one computer but works on a different one

I'm trying to run the geoprocessing tool "Dissolve" on a single feature class in a File GDB, yet I'm getting the error 999999 "the operation was attempted on an empty geometry", but there are no empty ...
3
votes
2answers
473 views

Stratified Random Sampling with large dataset in ArcGIS?

I want to create a Stratified Random Sample with a land cover classification map. The purpose for the Stratrified Random Sample is to produce an Accuracy Assessment. I am using ArcGIS 10.2 with access ...
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0answers
24 views

Dissolve shapefile and summarize text fields [duplicate]

I have a polygon shapefile that I would like to dissolve on a field called FID_merged (see below). For each dissolved polygon I would like to summarize a list of the countries. I am using ArcGIS 10....
2
votes
1answer
89 views

Dissolve tool is splitting features rather than dissolving them

I had UK area divided into six different zones. I wanted to dissolve my feature class by zone just so I have six features in it. I used Dissolve tool which worked fine for five zones. One of the ...
2
votes
1answer
413 views

Merge or dissolve line features based on two or more attributes

I am working in Arcmap 10.2 and I would like to do the following according to the example table below, but I do not have a clue on how to do this. I am working in ModelBuilder. Is there a tool for ...
1
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0answers
141 views

QGIS/GeoJSON: Dissolve featurecollection consisting of polygons and multipolygons into a large multipolygon

I've read this question. I would like to know how to do this in QGIS. I have a Geojson file with a featurecollection, starting with: {"type":"FeatureCollection","features":[{"type":"Feature","...
0
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0answers
76 views

Dissolving features by attribute(s)

How to apply ‘statistic_field’ to just one ‘dissolve_field’? I have a feature class that I need to dissolve by PageName but also by earliest year in SERVED_YEAR. So, how to apply MIN to SERVED _YEAR ...
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0answers
66 views

After Dissolve data Need elevation

I have a problem in Arcmap 9.3 When we are using 3D data in ArcMap to dissolve it the elevations are lost. Is there someway to keep the elevation during the dissolve method?
2
votes
1answer
596 views

dissolve polygons of GeoJSON with gdal/ogr

I have a GeoJSON with only polygons in it. I have to dissolve (merge) the polygons with the same "DN"-value. I found out that you can do it with shapefiles like this: ogr2ogr outputfile.shp inputfile....
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0answers
100 views

Dissolving polygons with common attribute within certain proximity to each other using QGIS?

I have a land parcel with a lot of polygons with the same attribute (owners). I would like to dissolve all the polygons with the same owners but only if the polygons are within 100m of each other. How ...
1
vote
1answer
767 views

Combining rows in an attribute table based on field

I am using ArcMap 10.2.2 on a Windows 7 PC. I have shapefile range data for multiple species (multiple species in one layer), and this range data is accompanied by information relevant to the ...
1
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1answer
163 views

extract 1st level boundaries from GADM worldmap in QGIS

I need a world map, broken down to GADM 1st level. The obvious way would be to download all single country .shp files and merge them. But that is far too tedious of course. I tried the dissolve ...
2
votes
0answers
79 views

How to union linestring data distributed on multiple layers?

I have four shapefiles. Each contains a linestring as shown in the image. Each shapefile is represented as its own layer in QGIS. I would like to union these linestrings into one polygon which ...
2
votes
1answer
84 views

Obtaining block structure from parcel data using QGIS or ArcGIS for Desktop?

I am trying to analyze the urban form of a city. I don't have the polygon file for streets, so I must derive block structure from parcel data (see image below). What tool could I use to accomplish ...
6
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4answers
1k views

How to Unsplit/Dissolve multiple touching lines in Stream Network?

I am trying to dissolve multiple lines for stream networks into individual features. The dataset contains many stream networks so a complete dissolve of the whole dataset wont do as I would like to ...
1
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0answers
217 views

ArcGIS DissolveManagement Memory Problems

beside other tools I am using the dissolve tool in a python script. The input feature class (polygon) has about 140 MB. Running the script with python 32 bit (in CMD and in ArcGIS Desktop 10.2.2) ...
0
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0answers
53 views

Dissolving points based on easting and northing with statistic type first as aggregate function using PostGIS?

I have two points features having point_ID, Easting and Northing fields and want to dissolve based on Easting and Northing with statistic type aggregate as "first" for point_ID, as you do in ArcMap. ...
6
votes
1answer
163 views

Create buffer based on polyline without line end caps and without dissolving the created polygons in QGis

I have a projected line layer (Shapefile) in QGIS. For every line segment I want to create a polygon without line end caps. The resulting polygone should not be dissolved to a single one. I tried ...
3
votes
1answer
124 views

QGIS Dissolve tool re-projects and rotates layer

I'm trying to use QGIS (2.6.1-Brighton) to aggregate polygons according to an ID attribute. I'm using the shapefile of school district polygons in Michigan found here: http://www.mcgi.state.mi.us/...
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vote
3answers
174 views

Why dissolve creates many extra features?

I have a shp file in Arcmap 10 that has ~16600 polygons. Some overlap. I want any polygons that are overlapping to be dissolved into single polygons. I want non-overlapping polygons to remain the same....
3
votes
1answer
320 views

Query to Dissolve Nearby Polygons on Hive

I am using the ESRI spatial framework for Hadoop, that extends Hive to use spatial types and operations. My objective is to translate a set of simple queries on PostGIS into Hadoop, in order to ...
2
votes
1answer
49 views

Spatial join by categories in QGIS

I am using QGIS 2.4.0 and I have a vector layer which contains a remoteness indicator which is broken up into 5 categories. I would like to turn this into a layer that has these 5 categories collapsed ...
4
votes
1answer
942 views

“Singleparts to multipart” vs. “Dissolve”

It seems to me that the vector tools "Singleparts to multipart" and "Dissolve" do the same things. Can someone confirm this, please? Or do I overlook something?
0
votes
1answer
45 views

Dissolving and returning values from primary lines

Im building a model and I need to dissolve line, that I marked in picture, to a line with field(NUMBER_OF_LINES) value of 2. Thsi filed represents how many lines were constructed to one line after ...
4
votes
1answer
216 views

Issue with dissolving a polygons layer in QGIS 2.4

I downloaded a dataset of roads and parks from OSM. I then buffered the roads and merged with the parks. Now - all i want is to dissolve / union all the features in the merged layer. I fail to do it ...