Topology describes non-metric relationships among geometric figures, such as adjacency, containment, and orientation.
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How to resolve an Invalid Topology [Incomplete void poly] error from a geoprocessing service?
I am consuming a geoprocessing service from my Flex application.
My geoprocessing service takes the input geometry, and intersects another layer. It then runs a Summery stats on the intersection ...
2
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1answer
466 views
How do I subdivide and edit polygons preserving topology?
I'm using QGIS. I have a layer made up of many adjacent polygons - let's call them "countries". I currently use the Atlas plugin to export each "country" polygon to a .png file.
I want to further ...
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1answer
111 views
I need help to find out more information about Topology Errors toolbox or Extension?
I need someone out there who can answer my question. I do not remember if I add this Topology Editor Extension or toolbox to my ArcMap. I would like to know more about this toolbox. Thanks. (Changed ...
4
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3answers
541 views
Questions on smooth lines on soil polygon?
In a couple of weeks I am going to do QA/QC on soil polygons and I'm wonder if there is a way for me to run a script or a tool box that allow me to find the jagged lines ?
Alternative, my plan would ...
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1answer
2k views
Remove Holes Existing Within a Single Polygon in ArcGIS 10
I have a shapefile that consists of a single polygon. I have gaps within the polygon that need to be eliminated. The resultant dataset shoulde be a single, solid polygon.
I have tried implementing ...
9
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3answers
1k views
How to connect lines in a network?
I have a shapefile of lines and another of polygons. When two or more lines intersect a polygon they should be connected (snapped), but sometimes during manual digitization this doesn't occur. I need ...
4
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3answers
810 views
How to select all dangling polyline features with Arcview license?
I have a city roads shp file and would like to identify (select) all the locations where a roads ends (in other words dangles). I am working in ArcView 10.
I do not want to use a topological tool ...
3
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0answers
139 views
SDE Topology dirty areas don't go away
Just looking for an explanation on SDE Topology dirty areas that don't go away. My workflow involves editing a version of SDE data, then once finished I use the Validate Topology in Current Extent ...
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3answers
565 views
Efficiently finding the 1st order neighbors of 200k polygons
For every one of the 208,781 Census block groups, I'd like to retrieve the FIPS IDs of all of its 1st order neighbors. I have all the TIGER boundaries downloaded and merged into a single 1GB ...
16
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1answer
863 views
What's the status of Postgis 2.0 topology support in QGIS?
Having followed the Postgis developments over the past 6 months I have noticed a bunch of features which seem to be incredibly cool especially in the area of topologies and associating calculations on ...
3
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1answer
795 views
Intersect two polylines using ArcObjects
I have two polylines and would like to find the intersection(s) using ArcObjects / VB.NET.
I'm using the following code:
Dim topoOp As ITopologicalOperator = TryCast(pTestPoly2, ...
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2answers
244 views
Automatically apply topology rule to only selected portions of a .shp file?
I am looking for some examples/tutorials on how to apply a topology rule to only a selected portion of a shp file using a script in ArcGIS/GRASS.
Using ArcGIS seems to always require an interactive ...
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0answers
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Topology - To be, or not to be, that is the question [closed]
Topology, I mean "real" topology, is not a new concept and it's available since a long time in GRASS gis. I won't speculate the reasons myself but, after a long period of spaghetti model ...
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2answers
247 views
Negative Point Valence topology error
I am getting the following error when I try to erase a set of data from a file within a gdb. Any idea on what to do? I have done repair geometry multiple times on the input/erase datasets. I have 16GB ...
7
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1answer
1k views
Ring Self-Intersections in PostGIS
This is a follow on from previous question. You will see I am a new PostGIS user.
I have looked at the validity of the topology in my data and find around 1700 topology issues in the landcover ...
13
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1answer
568 views
Identifying topological relationships using PostGIS
I'm trying to perform a basic typology analysis using PostGIS. My objective is to find any polygons that touch other polygons. To do this, I thought the ST_GetFaceEdges would work
(reference). I want ...
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votes
2answers
302 views
Determine point relation to given line
In ArcGIS engine I have a polyline with From and To points. I also have a Point. How can I determine if the point is located on the right or left of the line on the plane considering the direction of ...
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0answers
179 views
Convert SmallWorld GIS topology to pgRouting topology
Is there any way to convert SmallWorld GIS topology to the format that pgRouting use?
My costumer have use SmallWorld GIS and make his topology on it. but when he export his information as shape file, ...
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7answers
864 views
How to identify polygons with “flag” sliver errors
Working in ArcMap, I have come across errors in a polygon layer that I will call "flag slivers" (taken from similar language in parcels call "flag lots"). These sliver polygons (see image below) are ...
6
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3answers
1k views
Create features from ArcGIS Topology errors
I have imported field users shapefiles into an ESRI geodatabase so that I can create some topology rulesets that identifies the errors as needed. Unfortunately the field users do not have a license ...
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2answers
493 views
What does 'building topology' mean for pgRouting?
From a couple of answers at gis.stackexchange.com and at the pgRouting mailing list I have found out that pgRouting 'builds topology'. What does that mean?
If for example we import an .osm file into ...
6
votes
1answer
604 views
How to preserve topology while editing polygons in OpenLayers?
I’m facing this issue: I have a chloropleth map based on a set of polygons with some data. Using WFS-T (postgis, geoserver, openlayers) I am able to edit the geometry of the polygons. This works fine.
...
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2answers
233 views
Just view topology errors in ArcGIS
I have a basemap (parcels), which is to be used as target for several conflation tasks. This basemap MUST NOT be modified in any way.
The basemap ist part of numerous topology rules. Each time ...
6
votes
1answer
155 views
Optimize GEOSGeometry's spatial operations by avoiding thread-safety checks
A ranking algorithm I'm developing for a Django webapp requires performing spatial operations (within, intersections, sym_difference, etc.) using a query against large number of geometry objects.
...
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2answers
496 views
Batch fix overlap errors
I have a feature class with about 250,000 contiguous polygons. ArcEditor turns up around 9,000 overlap errors when I validate the topology. I want to merge each of these errors into one of the ...
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votes
2answers
431 views
Topological relationship between two polygon feature layers
I have two polygon feature layers: one representing land parcels and one representing roads. Some land parcels (polygons) coincide with a part of a road (another polygon feature). How can I check ...
6
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1answer
89 views
Dividing the world space to geographic sub-space
I am trying to divide the world space to geographic sub-space from "general" to "specific" locations and without using latitude and longitude information. That is, I am trying to think about the world ...
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2answers
458 views
topology problem
may anyone tell me , how to fix error after running topology rule in arcgis? i try to subtract and create new layer , but failed warning has been appear constantly ,,,
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0answers
231 views
topology rules for structuring topology data to get line feature as topoparent in topology graph
i Created topology graph of a polygon feature and i copied geometry of topology edges into line feature class,and topology nodes into point feature class
i created topology layer containing ...
5
votes
1answer
654 views
How to create adjacency matrix of topology graph of arc map for shortest path?
I have created a topology graph of a polygon feature and I want to find the individual FIDS of the lines of the polygon. I want to construct an adjacency matrix to create the shortest path. How can I ...
2
votes
1answer
545 views
3d polylines and polygons
Is there a way to extract z values from a DEM into a polyline and/or polygon featurclass in arcmap 10? I would like to have 3d polylines and polygons to make cross sections in a CAD, but currently I ...
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votes
2answers
269 views
Getting line FID from polygon ITopologyGraph
I want to export polygon Arc list to txt file for that
I created topologygraph for personal geodatabase feature class (polygon)
using ITopologyGraph::build.
I got polygon FIDs but I am not getting ...
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2answers
305 views
topology of geometries in gis
http://imm.io/2cpJ
What is the thinking of OGC to keep this point that "point have no boundry , it just has interior"... what do they mean?
this notation: F**F*****...still i am confused due to OGC ...
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2answers
1k views
What are the benefits of Multipart Features?
Multipart points, lines, and polygons are implemented in nearly every GIS, but what benefits, if any, do they provide?
In a relational database attributes shared by different features can be stored ...
9
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4answers
2k views
Remove Duplicate Polygons Using Open Source Tools
I have a shapefile containing features with duplicate geometries, but different attributes (e.g. a polygon with attribute XX, and an identical polygon with attribute XY). I want to identify the ...
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1answer
525 views
ArcGIS topology rules file (.rul)
Has anyone converted ESRI's topology rules file (.rul) into another format? I built a complex topology rules set and would like to QC it in something easier to read and work with than ArcCatalog. A ...
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2answers
790 views
Arc node topology in ArcMap
I would like to implement an arc node topology in arcmap. Do you know how can i build node topology from line layer in ArcMap 9.3.1?
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votes
5answers
1k views
How to convert line simple features to topological network?
using Gdal/ OGR is there a way to convert a shp, kml, or PostGIS line layer into a network of nodes and segments so it can be used in packages such as networkx?
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8answers
1k views
How to build topology without an ArcEditor or ArcInfo license?
I have a huge dataset that I am capturing that was full of errors previously and I want to make sure that the new version is error free - which can be very time consuming with only an ArcView standard ...
