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Questions tagged [topology]

Topology describes non-metric relationships among geometric figures, such as adjacency, containment, and orientation. It is a branch of Mathematics, which deals in geometry without measurement.

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Line sequencing error

I have clean topology, also validated, but when I am loading it I to parcel fabric, it shows line sequencing error, what can I do about it?
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How to add rules to the topology from a .rul in ArcPy

I am trying to create a new topology using and ArcPy script and I have a lot of rules inside a .rul archive. The function to do that is: arcpy.AddRuleToTopology_management(out_topo, rule_type, in_fc1,...
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Disabling some topology rules temporarily to speed up checking other rules using ArcMap?

I am using ArcMap 10.6. I have a topology with a large number of rules and many feature classes. I need to check only certain rules and feature classes and wondering the best way to do this without ...
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3answers
68 views

Seeking alternatives to Geodatabase to describe topological relations?

According to switchfromshapefile.org, there is no way to describe topological relations in a shapefile. I am aware that this can be done using a Geodatabase and I have heard of TopoJSON. If there are ...
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27 views

Segmentation of a line based on several overlapping lines within the first line

I stumbled over a problem which I can't figure out myself so maybe you can help me.. I have a line going from 0 to 100% of its length. On this line I have 1:n lines with different information and ...
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1answer
34 views

Does parcel fabric have topology built in?

I am a little confused on parcel fabric. Does parcel fabric have a topology built in already? OR are you supposed to create a topology for your parcel fabric? Just a little background is that I have ...
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2answers
58 views

Moving multiple points in batch using ArcGIS Desktop?

I have multiple parcel polygons and they all have one side touching the lake polygon. Each parcel polygon has a point inside which is now at the centroid of the parcel. I need to find a way to move ...
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32 views

PostGIS Simplification on topogeometry does not respect topology?

I'm testing the code in the book "PostGIS in Action" (2nd ed) on Topology-based Simplification: DROP TABLE IF EXISTS _temp_table; CREATE TABLE _temp_table AS SELECT feat_name, ST_Simplify(topo,150) ...
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1answer
25 views

How to reset the id number of newly generated PostGIS topology?

I'm trying to create a clean, new topology for testing by discarding the old topology first, i.e.: SELECT DropTopology('ch13_topology'); SELECT CreateTopology('ch13_topology', 32610, 0.05); However,...
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16 views

repeated TopoGeo_AddLineString creates multiple entries in PostGIS topology?

I just noticed something strange in PostGIS topology (PostGIS 2.5). When applying TopoGeo_AddLineString() to the same geometry multiple times, it creates more than one entries in the edge_data table. ...
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1answer
55 views

Cleaning topology errors in PostgreSQL (vector data) using QGIS?

I need to append the shapefiles to a PostgreSQL database. Once the data gets appended to PostgreSQL, some topology errors like gaps & overlaps can be seen. By using the v.clean tools the topology ...
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2answers
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Editing shared boundary of two polygons at same time using ArcGIS Desktop?

If there are two square polygons next to each other, sharing a boundary is it then possible to adjust the shared boundary so that the size of both squares change as opposed to making one square bigger ...
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1answer
32 views

Find Close Vertices in QGIS

I am trying to find digitizing errors in a line-layer. Obviously the snapping was not activated when the person who digitized created the lines. As far as I know QGIS cannot find undershoots, so I ...
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1answer
46 views

More customizable topology options for QGIS

I'm working on a polyline network where there are a lot of open-ended lines that I do want, but also a lot that I don't. QGIS's topology checker flags all cases, making it a major hassle to go through ...
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51 views

Dealing with bridges over roads in PostGIS topology?

first time posting please ask for more details if not enough provided. I am using OSM road data and have created postgres topology for them. I am now cleaning up the data before exporting it for ...
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1answer
41 views

Finding difference in gaps between polygon

I am using ArcGIS Desktop. I have a feature class of polygons. At first I run topology with rule "must not have gap" error. I find 250 errors (these all are exceptions). After shifting all the ...
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74 views

Topology Network in PostGIS database

I'm returning to the same question all over again. I'm dealing with electrical network and I'd like to build topology for all network lines in database so I can construct nodes and edges dynamicly for ...
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1answer
38 views

Polygons split themselves when I zoom out

I've been having issues with polygons getting deleted and re-created in this layer, and also with polygons not merging the way I would expect. I thought I had everything fixed-- my topology check ...
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1answer
41 views

Remove overlaping vertices in lines - QGIS

I am currently working with data that has a huge amount of topological errors. These are lines that are closed, in the place where the beginning of the line meets the end, someone added more than 2 ...
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1answer
67 views

PostGIS topology hierarchal topogeometries

I'm seeking guidance on how to correctly organise hierarchal topogeometries. I'm working through PostGIS in Action's chapter on topology and, in summary, it sets up two tables with topogeometries, ...
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1answer
153 views

How can I enable topological editing in QGIS 3

How can I enable topological editing (create shared nodes on adjacent polygons or intersecting lines) and also activate the option to prevent polygon overlap (that when a new polygon is drawn, its ...
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1answer
41 views

Connect points to lines so moving points moves line?

I'm trying to create a simple sewage system in ArcMap. I want it so that when I move a node/point, the line is moved as well so it needs to be attached to the point (dynamic link?). A Point may have ...
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Deleted Topology and Feature Classes are still locked within Geodatabase

I deleted my topology within a geodatabase rather than disconnecting the feature classes inside of it. Doing this appeared to have deleted all 4 feature classes that were within the topology entirely ...
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1answer
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ArcGIS Pro Topology - Fix multiple errors in one step through Inspector

Does someone know if it is possible to select multiple "error-features" in ArcGIS Pro Topology error inspector and fix all of them with the same solution (e.g. create new feature)? Currently in ...
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RoadLink and RoadArea topological relation in INSPIRE

I have some confusion about RoadLink and RoadArea topological relation in INSPIRE (Infrastructure for Spatial Information in the European Community). If I got this correctly: RoadLinks are connected ...
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1answer
59 views

Automatic cleaning of polygon overlap based on attribute in QGIS

I have a shapefile with overlapping polygons. I need to clean these overlaps based on an attribute: in case of polygon overlap, the polygon with the lowest value of a given attribute needs to be ...
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Checking snapping connection of polylines? [closed]

I would like to find a method using ArcMap that could check if all polyline are snapping and connected. I tried to create road network, but I can see this information. I have multiple polyline, and ...
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2answers
277 views

Checking if vertices of polygon are in clockwise or anti-clockwise direction in QGIS?

Is there a simple way to calculate a field in QGIS indicating if the vertices of each polygon feature in a layer are in clockwise or anti-clockwise direction? For simplicity, lets assume the layer ...
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1answer
33 views

Adding ArcGIS topology rule that allows Attribute based exceptions?

I want to run a topology - one is geometry based where I am looking for overlaps as error, but in my database I want to keep some error as exceptions (such as road over waterbodies). One option is ...
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1answer
44 views

Discerning dwelling types in QGIS? [closed]

In QGIS, I want to discern between a number of building types, based on topology. I have data on buildings, parcels and addresses. I'm having a hard time to discern between row/terrace, end-of-...
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0answers
121 views

How do I select the longest connected lines from PostGIS ST_ApproximateMedialAxis?

I used PostGIS ST_ApproximateMedialAxis to transform polygons representing mountain ranges into a series of lines. Now, I'd like to select only the "longest" line segment for each group, so that I ...
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108 views

How to automate topology check/fix in QGIS?

Short version: I have a layer with 19483 features with plenty of topological errors and I would like to fix/review them as many as possible in an automated way but don't know how to do it. ...
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43 views

error 999999 add rule to topology management

I was trying to create a topology with some rule, but I have problems with the rule "Must Be Covered By Feature Class Of". I get the error "999999: Error executing function." This is the code: WU =...
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Cannot Create Topology in SDE

I am trying create a topology for a zoning dataset in my SDE feature dataset. I've run into a few issues. First off was an issue with versioning that this questions resolved: How to solve "Cannot ...
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2answers
36 views

When topological editing how can I automatically snap lines to lines close to them?

Using ArcMap 10.3, advanced license, I have a data set of road lines and another data set of road surface conditions, and I need to apply the road conditions to the road line as an attribute where it ...
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40 views

QGIS topology check shows different topology check results for same area

I used QGIS topology checker for parcel data of an area in QGIS 2.18. The rule used was- 'Parcel must not have gaps'. The result showed many error (gaps) and while zooming in and zooming out, the ...
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25 views

Arcpy export topology errors bug

I have created an ArcGIS Python script tool that creates and validates a topology dataset, exports the topology errors and performs some analysis between the topology errors and their source feature ...
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1answer
73 views

Fixing bad topology on polylines with QGIS

I've been sent a shapefile containing 12 layers of some city's road system. Each layer depicts a portion of the road system, and all of them partially overlap on the map. I'd like to work on the sum ...
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3answers
108 views

Align one polygon boundary to another boundary

As visualized in the picture as an example, two polygons should be aligned to each other. The boundaries of the green polygon should not be changed. The blue polygon may therefore only be adapted to ...
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42 views

Handling dangling nodes in ArcGIS Desktop?

I have a datafile of line features. The creation of a topology revealed that there are too many dangling nodes to be corrected manually. I was thinking of snapping to the closest line feature in an ...
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0answers
103 views

ST_Difference in PostGIS : problem with geometry result (Polygon)

I'm experimenting a result issue using the ST_Difference spatial function in PostGIS. Input : Feature 1 and 2 overlaps each other. Both contains 5 vertices, like a rectangle (4 plus an additional ...
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1answer
205 views

Repairing all topology errors at once in ArcMap?

In 2012 an ArcMap user wrote Automatically fixing multiple errors using Fix topology error tool?: I am a ArcGIS.10. user. I'm want to solve multiple errors using the fix topology error. So I ...
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117 views

TopologyException issue when doing intersection in Geopandas?

When I do overlay processes like intersection, I mostly get: :TopologyException: found non-noded intersection between LINESTRING (229971 4.39944e+06, 229971 4.39944e+06) and LINESTRING (229971 ...
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2answers
265 views

Is the erratum about polygon point order in GeoJSON correct?

The GeoJSON specification (RFC 7946) states that for polygons: A linear ring MUST follow the right-hand rule with respect to the area it bounds, i.e., exterior rings are counterclockwise, and holes ...
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28 views

Topology validation problem

I have a problem with a feature class which has a topology problem between two polygones. The problem is when I select an error area and I merge It, the error remains. The two rules that I used are : ...
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1answer
350 views

QGIS 3.0.3 topology checker to find gaps between polygons

When using QGIS 2.x I have used Topology checker to find gaps between polygons, crossing lines and duplicated points/vertex. I also liked that it shoved a list of errors where I could zoom into each ...
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63 views

I can't import or export a topology

I tried to export a topology using the function arcpy.ImportTopology_defense(GDB_input,os.path.join(arcpy.env.scratchGDB,dataset+".xml")) but it throws an error : AttributeError: 'module' object ...
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topological edits in ArcGIS for Server

I am developping a ServerObjectExtension using ArcObjects to extend an existing map-service. Now I want to perform some edits. There are many featureclasses that have to be handled together. However ...
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134 views

Self-Contact Topology Errors?

I've been trying to clean up some vector data sets so that I can reproject them to WGS84 but I keep finding topological errors that fail the process. The one error I can't resolve involves a node on a ...
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1answer
97 views

Editing two layers topologically in QGIS?

I have different polygons in layer a_input. The Polygons are adjacent and connected inside the layers and it should be. The Polygons in layer a_input have to fit adjacent to a polygon of layer 2 ...