To merge features based on specified attributes.

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1answer
693 views

Dissolve features in ArcGIS using multiple attributes

This may sound simple, apologies if I missed some earlier discussion on same subject. I have a big set of road data with road numbers and also zone numbers . The road names can repeat across the ...
2
votes
1answer
43 views

ArcGIS Dissolve leaving feature snippets in dissolved polyons. Repair doesn't fix

I'm trying to dissolve some low-level polygons, but the result I'm getting has lots of little pieces of lines left floating around in the output polygons. I've tried doing "repair geometry" on both ...
2
votes
1answer
162 views

Merge section polygons in PLSS

I am trying to merge quarter quarter sections of polygons from PLSS into a quarter section. However, I also want it assigned to correct Township/Range/Section while merging. I know I can hand merge ...
2
votes
1answer
2k views

ArcGIS10 - How do I dissolve two different buffers together so they are not overlapping?

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 ...
2
votes
1answer
162 views

QGIS 2.4 dissolve doesnt work properly, why?

I am used to work with ArcGIS and now I started to explore QGIS more. I have problem with dissolve function. I have administrative borders and I would like to dissolve them into higher administrative ...
2
votes
2answers
171 views

arcpy.Dissolve fails; need a arcpy dissolve to multipart workaround

I have a arcpy script in which I am using arcpy.Dissolve on a single feature class with multiple features to get a single multi-part feature in the output. The script is successful only part of the ...
2
votes
1answer
446 views

How to define polygons overlapping each other?

I have a shapefile of landuse in different catchments. I want to calculate the percentage of each landuse category in each catchment using Tabulate Intersection. Before using this tool, I had ...
2
votes
1answer
192 views

Dissolving stream orders using Python rather than VB script?

I've been trying to dissolve streams, using orders programatically and I came across this VB script. The reason is that if I use ArcGIS dissolve, it merges the confluence of the same orders. I would ...
2
votes
1answer
538 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. ...
2
votes
2answers
222 views

Aggregate/dissolve MySQL geometry

On Centos, I have a MySQL 5 database with a MyISAM table that has a geometry column with a spatial index, containing US county boundaries. Trying to combine/aggregate/dissolve some of these into as ...
2
votes
1answer
886 views

Merging polylines together keeping the attributes of the largest one

I have a set of polygons with polylines running through them. I am trying to assign the polylines the polygon ID that they pass through the most. I have already split the polylines to the polygon ...
2
votes
1answer
1k views

How to correctly merge layers with overlapping polygons in QGIS/GRASS?

I have 4 vector shapefile that I would like to join/merge, without worrying about attributes. Here are the shapefiles. I would like to do an union and a spatial dissolve, but everytime I do a dissolve ...
2
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0answers
48 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
0answers
47 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 ...
2
votes
1answer
93 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: ...
2
votes
1answer
131 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
33 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 ...
2
votes
0answers
26 views

ArcGIS dissolve analysis output issues in geoserver wfs/ PostGIS

I have an ArcGIS dissolve analysis output (parcel data) that needs to be loaded on PostGIS and published as a wfs from geoserver. The issue is that the ArcGIS dissolve output shapefile, although can ...
2
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0answers
51 views

how to make a list of features constructing the dissolved feature?

I need to simplify my road network using the dissolve function to remove nodes not occurring on the intersections. the following code is doing that. arcpy.Dissolve_management(self.address_cor_layer2, ...
2
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0answers
77 views

Dissolve Statistics Fields and Statistic Type as Parameters in GeoProcessor

I have a published service which uses a dissolve. In arcMap the I get prompted for all the fields, including statistics fields and stat type. I have the statistics fields marked as parameters. ...
2
votes
1answer
343 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 ...
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3answers
380 views

Why would Dissolve stop working in ArcGIS for Desktop?

I have an ArcMap Add-In that completes various geoprocessing steps, including Dissolve (using ESRI.ArcGIS.DataManagementTools.Dissolve). This tool worked at 10.0, but I just upgraded to 10.1 SP1 and ...
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3answers
123 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 ...
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2answers
437 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 ...
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1answer
26 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 ...
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2answers
258 views

Merge Error: Not Enough Memory

I'm attempting to make a flood plain map for a school project, and am using FEMA Flood Hazard Symbology for the legend. I've dissolved by a Flood Zone Field, but am left with two attributes both named ...
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2answers
765 views

Dissolve polygons - group to others with touching corners

I am working with some data that shows land management. There are many places where corners "touch". I would like to dissolve my dataset so that features are grouped (dissolved) with those that they ...
1
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1answer
30 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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1answer
70 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 ...
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1answer
90 views

Postgres/PostGIS: Dissolve multiple fields with COUNT (Point shape)

I have loaded point .shp feature classes into Postgres 9.3 db, and enabled postgis,plpgsql,postgis_topology extensions. I'm looking to dissolve multiple fields within a single table 'TABLE1' and add ...
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3answers
2k 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
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1answer
204 views

python dissolve by field error

I would like to dissolve a feature class by a field. When I run the code, I receive an error that says, "invalid topology [out of memory]" I have 16GB of RAM and terabytes available on the hard drive. ...
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1answer
160 views

MSSQL server 2008 dissolve sql query

I have a set of spatial objects in a MSSQL server 2008 R2 trying to dissolve adjoining objects where one of the attributes are equal. The table below is somewhat representative to my original table: ...
1
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1answer
75 views

How do I create multiple polylines from single polyline that consists of disjunct sections?

My goal was to create a network of polylines in NHD plus based on start and end points associated with sampling locations. Dissolving by stream name was my first step and has worked just fine for ...
1
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1answer
28 views

Unsplitting Zpolylines without flattening vertical line segments?

Trying to figure out how to fully keep vertical line segments when using Dissolve/unspit lines... The first image shows the original Zlines in Arcscene The second image is the result of a Dissolve ...
1
vote
1answer
56 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
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1answer
29 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
23 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: ...
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0answers
26 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?
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0answers
48 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 ...
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0answers
91 views

Is table with 20,000 rows and 5 columns too large for Dissolve of ArcGIS for Desktop?

Is a table with 20 000 rows and 5 columns too large for arc map 10.2.1? I have tried several things without success to dissolve this table based on one feature. The table was obtained from the ...
1
vote
1answer
78 views

Merge polygon based on other line shape file PostGIS

I have a polygon shape file and a line shape file. I would like to merge two polygons which shares the same border along with line shape. Finally the line should be removed in polygon shape file. In ...
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0answers
29 views

Polygon dissolve in DB

I have a polygon feature class with more than 100,000 polygons in DB2 table. I would like to dissolve them based on a single field to reduce the row numbers. Is there any commands / SQL in DB2 to ...
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1answer
100 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 ...
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0answers
125 views

How to calculate Median of a table field in the Dissolve Tool of ArcGIS?

The Dissolve Tool of ArcGIS 10.0 has some statistical parameters as a type of calculation new values of each field in a process of dissolving of identical parameters . It has SUM, MAX, MIN, RANGE, ...
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0answers
30 views

How do I dissolve to a predetermined number of contiguous geographies based on equal division of a value?

Let's say I have a layer that is the state of Oklahoma, broken up by county, and I want to dissolve it into contiguous regions of roughly equal population size, and I want to define how many regions ...
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3answers
613 views

Is there a dissolve / ST_Union function that will close gaps between features?

I've been reading a number of related threads about ST_Union, ST_SnapToGrid and ST_Dump but I haven't been able to solve my problem. The problem is I am trying to merge Tiger/line census tracts that ...
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0answers
68 views

Determining homogenous blocks of individual tree species in a woodland, and creating a new shapefile without blocks/polygons of < minimum area?

I'm working on a project attempting to identify suitable woodland habitat for red squirrel translocation wherein conservation efforts could be focused. Below is a small section of the map showing ...
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0answers
124 views

Why doesn't dissolve finish? It just stops without error message

I have a shapfile of the whole UK that contained Postcode area, district, and full postcode. I was going to try and dissolve the regions into seperate business areas by joining a lookup table that ...
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0answers
205 views

How can I merge postcode sector polygons into larger territories in QGIS?

I'm new to GIS so patience might be required :-) I'm building a basic web-based mapping tool for business use, to be used as a demo to show that we need one but managers don't know it yet! So far ...