To merge features based on specified attributes.

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17 views

Merging multiple fields with same parcel id yet different attribute values, while keeping all fields?

I am using ArcGIS 10.3 for Desktop. I have a property parcel layer that when Intersected, each parcel is broken up into hectares of different land covers. My question is can this be merged (or ...
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1answer
23 views

How to dissolve polygons that overlap both on each other in QGIS?

I have two layers of polygons with landcover classes(meadows, cropland, forest, ect) They overlap in both directions, i.e like a zipper. I need to dissolve them by one attribute (Class) so I can have ...
3
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3answers
48 views

Dissolving redundant fields in ArcGIS for Desktop?

I have a map of a small neighbourhood. I'm trying to label these but because of the grid being squares the objects are split and therefore showing two two or more labels of each location. I'm trying ...
2
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0answers
27 views

Combining adjacent shapefiles and merging neighbor polygons currently divided by quad boundaries

The project I'm working on has been mapping ecological sites in ArcGIS on a quad-by-quad basis for the past 10 years. When entered into GIS, each quad has its own shapefile and the sites are cut off ...
3
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2answers
116 views

Dissolve a polyline feature class so that touching features dissolve into a single feature

I'm trying to dissolve a polyline feature class so that spatially intersecting features become a single feature. When I run the Dissolve tool, setting Create multipart features and Unsplit lines both ...
2
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2answers
137 views

Dissolve line segments in QGIS if they touch and fall within the same class. (tools or script?)

I have line segments that have the following 3 attributes (Class, start_point, end_point). I would like to merge/dissolve line segments that fall within the same class if they intersect (touch). i.e. ...
5
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3answers
77 views

Dissolve overlapping polygons in SAGA

I've got the following (2D!) situation of overlapping polygons: I would like to have the polygon border dissolved such that I have only one polygon left. I thought this was a definitive case for ...
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1answer
54 views

Dissolving in ArcMap gives “Invalid Topology [Duplicate Segment.]”

I am attempting to use the dissolve tool on a shapefile, but it fails with the error: ERROR 999999: Error executing function. Invalid Topology [Duplicate segment.] I tried checking and repairing ...
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2answers
73 views

Dissolving with PostGIS slow and results in large table?

I am having a table of polygons with some 15 Mio. records. The polygons hold an attribute called "dn" with integer values between 0 and 6. My goal is to simplify that table so that polygons below a ...
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1answer
57 views

Invalid parameters using ArcPy dissolve and statistics_fields

I am trying to use the Dissolve_management tool using ArcPy. I keep getting an error that reads "Parameters are not valid.", and I cannot figure out where I am going wrong. Here is the code: ...
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2answers
49 views

Dissolving contiguous clusters of polygons and identifying them separately in attribute table of ArcGIS for Desktop?

I have a layer comprised of about 500,000+ simplified polygons that resulted from converting raster cells to polygons with raster cell values assigned to them. When I select the resultant polygons by ...
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51 views

Dissolve in python script not working correctly

I have a python script that merges 12 shapefiles into 1 shapefile with about 75k total records. I want to dissolve the latter shapefile on a particular field, and SUM another field, so my final ...
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27 views

Mulitpart dissolve equivalent with SQL Server

SQL Server 2012 has introduced a handy set of geographic aggregate functions that is well summarized here. Among the aggregate functions are UnionAggregate and CollectionAggregate. UnionAggregate is ...
3
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0answers
85 views

Dissolving polygons in a large dataset

I need to dissolve polygons by the ID attribute in a large dataset (+-1gb shapefile). I have been struggling to find an efficient method to do this. I have tried the following methods: Postgis ...
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1answer
58 views

QGIS 2.12 Lyon - SAGA dissolve tool keep only one column of data

I have installed QGIS 2.12 Lyon and I need to dissolve multiple polygons according to one column in the dbf file (my layer is a shape file). I have used SAGA "Polygon dissolve by attribute" algorithm ...
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1answer
90 views

PostGIS: How to dissolve vector data

I have a few scenarios where I need to dissolve vector data, and I'm wondering how to do this using PostGIS. What would the queries look like to perform these operations? Below I'll describe the ...
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0answers
13 views

Dissolving and labeling time enabled data using ArcGIS Online?

I have 12 feature classes with time-enabled data (~4000 polygons each), where each polygon corresponds to an administrative unit between certain years. So a polygon can appear several times or only ...
0
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0answers
103 views

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?
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2answers
70 views

Dissolve multiple polygons into one based on background layer

I have a layer of regions (25 regions) and a layer with thousands of polygons. I want to dissolve this into 1 polygon for each region (so I can calculate the exact geometry). I used the dissolve tool ...
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2answers
103 views

Overlapping polygons and features and how to dissolve

I am new to GIS area and also new to any software that can modify the GIS. I am currently working with South Australia map I have download from Australian census site. I am using QGIS to load the ...
2
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1answer
44 views

Dissolving Features from different Layers

I'm trying to dissolve polygon features from different layers by their FID. If two polygons have the same FID the result should be one single polygon. Maybe this drawing will help to make clear what ...
6
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1answer
190 views

Deleting 'garbage' nodes after polygon dissolve

I work with QGIS 2.10.1 on Windows 7 (x64). I have dissolved polygons from an attribute value and the polygons geometries being not perfectly joined together, I get some 'garbage' nodes I need to ...
7
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1answer
430 views

Dissolving shapefile but retain attribute fields

Is there any way to dissolve shapefile but keep attributes fields in the same time? This is how I want to retain fields: There are two fields I want to conserve in a shapefile. The first column is ...
2
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1answer
53 views

Dissolving a TIN using python/ogr binding

I have a TIN model where I remove some of the triangles (see fig. 1). Most of the triangles touch on one edge, some on one vertice. I would now like to generate a polygon shapefile containing the ...
0
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1answer
37 views

Identify polygons greater than n-th percentile and perform further analyses using arcpy

My goal is to identify tracts that are above the 99 percentile of a variable (xvar), to dissolve contiguous tracts by summing a variable (yvar), and to get the coordinates of the centroids ...
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2answers
62 views

How to Dissolve Polygons Inside a Feature Class Based on Attribute Conditions

I have a large shapefile (saleArea.shp) which includes hundreds of small adjacent polygons. I would like to dissolve the polygons based on some conditions from tValues field into 5 bigger groups like ...
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1answer
72 views

Dissolve overlapping polygons in R

Is there an analogue of ArcGIS Dissolve function in R? I need to dissolve the overlapping polygons and create a single part object. I was trying to use gUnionCascaded, but it creates a multipart ...
5
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2answers
72 views

Identifying a cluster of polygons based on attributes

I'm trying to identify a cluster of contiguous parcels that, when combined, add up to at least a given size and, when combined, have an assessed property value less than a given $ amount. I have a ...
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0answers
89 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...
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48 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 = ...
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3answers
81 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 ...
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0answers
146 views

Creating multipart polygons with ArcPy? Dissolve Failure?

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 ...
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1answer
40 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 ...
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2answers
100 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
147 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
123 views

Assign overlapping polygons based on attribute

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
votes
1answer
74 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
119 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
162 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 ...
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2answers
104 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? ...
2
votes
1answer
89 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
39 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 ...
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1answer
94 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
36 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
281 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
52 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
43 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 ...
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1answer
92 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
33 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 ...
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1answer
37 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 ...