Topology describes non-metric relationships among geometric figures, such as adjacency, containment, and orientation.
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91 views
Learning resources for beginning differential topology for a programmer?
With this question I'm looking for suggestions about how and where to start learning differential topology starting from a good base of linear algebra and geometry, also consider that this know-how is ...
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votes
1answer
74 views
How can i topologically sort 2D triangles and put in an array?
I have a set of 2D triangles in a Geometry array which together forms a
connected strip when placed them according to edge adjacency. However, in
the array they are not in topological order based on ...
3
votes
0answers
45 views
Topology validate error
Im using Arcmap 10.1 version.I don't know where i made mistake my database.
I have attached an example image to show the Error Report.
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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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0answers
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Topology problems with QGIS/GRASS
*edited file links below
I'm working on several NGO projects at the moment, all of which are reliant on being able to use a district level map with some 490+ features, and I am running into some ...
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votes
0answers
120 views
Snapping line endpoints to a point feature class by adding a vertex
I have a line feature class whose endpoints should snap to the closest point in a points feature class.
The problem is, I do not want the lines to move, but rather a vertex must be added to the ...
2
votes
0answers
125 views
Question on QA/QC error list
As I am working on reviewing my soils spatial data, and I am doing my QA/QC I placed a point layer to check for errors. I add the field column to mark the error and state the error.
I recently ...
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votes
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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0answers
26 views
Joining layers with respective elements with PostGIS Topology
Recently I have started using PostGIS topology extension, but I have some difficulties in understanding how the structure works:
One of the key points is the use of "layer"s: as of what I understand, ...
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How do you split a feature using an existing line in QGIS?
All,
Is there a way to split a feature (polygon) using an existing line (selected polyline) in QGIS?
Thanks!
-m
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vote
0answers
78 views
How to handle/ avoid intersect errors when clipping the difference between two layers?
Using QGIS + Grass, I've added a shapefile of coastline and islands to my map.
I then buffer this shapefile to create a coastal zone of a known width. At this stage the buffer consists of the ...
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vote
0answers
66 views
From classified image to topology in ArcInfo
I have some coastal 4 band imagery that I have classified to designate land, water, and undetermined. I want to convert this to polygons with topology, and significantly simplify the polygons.
If I ...
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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 ...
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votes
0answers
13 views
Possibly corrupt polyline file is causing making polygons problematic.
I used the Feature Class to Polygon tool in ArcMap 10.0 to create a polygon from a polyline shapefile and some polygon boundaries (polylines) are disappearing in the process. The polyline shapefile ...
0
votes
0answers
27 views
generate hydro network topology on a stream network
I want to generate hydro network topology on a stream network without calculating catchments and drainage points.
My initial data are a Line layer (river network) and a DEM10 and the target is to ...
