To merge features based on specified attributes.

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2
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4answers
62 views

merge overlapping polygons with spatialite

The green points, buffered by one of the point attributes, should result in the three areas outlined in red (a table with three rows): I'd like to do it in spatialite. How can I do that? If it's ...
2
votes
0answers
22 views

Unsplit line Reversing Line Direction [closed]

I am using the unsplit line tool and I noticed that the direction of the lines with multiple segments is getting switched the opposite direction while the single sections seem to continue in the ...
3
votes
0answers
26 views

QGIS Dissolve skips polygons

I'm having trouble with the dissolve function in QGIS. Is it because of an overlap? It's not a GRASS layer, just shapefiles. I'm new with GIS software in general. Searched for similar problems but ...
6
votes
4answers
2k views

Improving upon ArcGIS Buffer/Dissolve performance?

I'm wondering if anyone else has experienced significant performance penalties when using the ArcGIS buffer function with the 'dissolve' option on point features. My dataset is a shapefile of 260 ...
3
votes
1answer
476 views

Problem when executing Dissolve method in ArcEngine

I'm always having a problem in GP.execute() when trying to execute this method. Here is my code: Friend Function DissolveFeatures(ByVal pInFLayer As ESRI.ArcGIS.Carto.IFeatureLayer, ByVal ...
1
vote
1answer
249 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 ...
1
vote
1answer
178 views

How to dissolve adjacent parcels by same owner but include those parcels located across the street with the same owner?

In trying to determine the total contiguous stream length per landowner, I dissolved parcels by parcel owner name attribute and intersected these dissolved parcels with streams. However, dissolving ...
-1
votes
0answers
49 views

Dissolve function doesn't include Dissolved field

The attached file is my script. I am trying to do dissolve along copy and create FCs. I don’t know why the output does not include dissolved field. import arcpy, os from arcpy import env ...
1
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0answers
39 views

ArcPy Dissolve Statistics Fields - fixed into variable

How can I change this fixed POP column into my variable: field = parameters[1].valueAsText. It says syntax error everytime. StatField = "POP MIN;POP MAX" arcpy.Dissolve_management(in_features, ...
2
votes
0answers
79 views

Dissolve Management in Python

I have a simple code that is pulling together polygon shapefiles from a Windows folder and merging them together into a single shapefile. In the same code, I want to add a dissolve command. My fields ...
1
vote
1answer
77 views

Merge and dissolve overlapping polygons?

I have a situation in which I have both network buffers and circular buffers around the same points (as separate feature classes), and I want to merge the buffers and dissolve into one polygon for ...
4
votes
4answers
115 views

QGIS classifying vector data

I am trying to classify a shapefile based on rule set, following this tutorial. This is the result: What I want to ask is: 1. How to insert the classification result (water, land etc) into the ...
1
vote
1answer
41 views

Arcgis dissolve output has greater area than inputs

I've been using dissolve to successfully merge polygons (which may or may not overlap) representing mining tenements so that I can calculate their total coverage area (using the geodesic area ...
1
vote
2answers
964 views

Looking for dissolve algorithm for Javascript

I have three adjacent polygons that together make up a larger shape. I need an algorithm that will dissolve the internal borders leaving only the outside border. An example would be a group of ...
2
votes
1answer
626 views

Why does Merge then Dissolve return ERROR 000732: Input Features: Dataset … does not exist or is not supported?

I'm not sure why I'm running into this problem. I thought it might have something to do with the merged file being locked or open, but I don't see a "LOCK" file being created in Windows Explorer. ...
1
vote
3answers
28 views

Dissolving while retaining field informations in the same entry instead of multiple entries

I have 1520 covenants. Many covenants have more than 1 VM symbols attached to it, currently showing as rows. EG. Covenant #97 has 4 VM Symbols, with the VM Symbols 1, 67, 117 and 171. How do I ...
1
vote
1answer
40 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 ...
4
votes
1answer
86 views

Dissolve overlapping polygons according to percent overlap using PostGIS?

I have a shapefile with convex hull polygons, all in the same layer/shapefile. Some of the polygons overlap (not duplicate polygons). I would like to dissolve/union the polygons which overlap with ...
1
vote
0answers
43 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 ...
4
votes
3answers
3k views

Why is the Dissolve Tool not working?

I'm still having trouble with the dissolve tool and I've tried all of the solutions offered here including moving the process from the background and repairing the geography. I've also tried amending ...
5
votes
2answers
79 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 ...
3
votes
1answer
290 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
4k views

Dissolving two different buffers together so not overlapping using ArcGIS Desktop?

I am trying to find out how many registered sex offenders live within 2,000 feet of a school/park in a specific county. The park buffer and school buffer are dissolved but not together. I am also ...
0
votes
0answers
247 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?
3
votes
3answers
57 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
votes
0answers
37 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 ...
2
votes
2answers
162 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. ...
3
votes
2answers
160 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 ...
3
votes
2answers
360 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 ...
5
votes
3answers
103 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 ...
3
votes
2answers
100 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 ...
1
vote
1answer
67 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 ...
1
vote
2answers
225 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 ...
1
vote
1answer
64 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: ...
1
vote
2answers
63 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 ...
0
votes
0answers
80 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 ...
0
votes
0answers
38 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
votes
0answers
104 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 ...
6
votes
1answer
202 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 ...
1
vote
1answer
104 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 ...
1
vote
1answer
72 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 ...
0
votes
0answers
17 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 ...
8
votes
4answers
20k views

How to Merge/Dissolve Polygons By Common Attribute Field in QGIS?

I have joined corresponding Local Enterprise Partnerships table data into a polygon shape file containing UK Local Authorities. How do I Dissolve or Merge the the Local Authorities polygons by ...
1
vote
1answer
572 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
vote
3answers
11k views

How to combine rows in attribute table using ArcGIS for Desktop?

I have an attribute table with three columns "FID" "Shape" and "Class" All records have the same shape (polygon). Each record has its own FID. I have three classes, "A", "B", or "C". I have twenty ...
1
vote
2answers
120 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 ...
1
vote
3answers
180 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 ...
2
votes
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 ...
5
votes
3answers
2k views

What dissolve tool in QGIS allows me to summarize statistics for multiple attributes?

Is there a tool or plugin in QGIS that resembles ArcGIS 10's Dissolve tool? I'm trying to dissolve several polygons (parks) around the boundaries of another layer of polygons (cities), while ...
14
votes
3answers
10k views

Is there a dissolve function in PostGIS other than st_union?

I'm looking for a function to dissolve shared boundaries between polygon features in a table. ST_UNION() almost does what I'm looking for, but it creates a multipolygon from all polygons in the layer ...