Linked Questions

6
votes
2answers
18k views

How to create a centerline from polygon in Arcgis 10 [duplicate]

In Network Analyst, I want to create a center line from a road polygon layer of an area for shortest path creation. How do I do this in ArcGIS 10?
0
votes
1answer
105 views

Get road polyline from road polyline buffer layer [duplicate]

I need to reverse the action of buffer tool. I had two polyline layers from two different sources with different attributes for a section of a city, that I needed to combine. In order to spatially ...
19
votes
4answers
14k views

Finding centrelines from polygons in QGIS?

I was wondering if there is a way to create centre lines from polygons in QGIS? I have a polygon layer, but ideally need the centrelines as a separate file.
19
votes
2answers
9k views

Finding tunnel center line?

I have some map files consisting of 'polylines' (each line is just a list of vertices) representing tunnels, and I want to try and find the tunnel 'center line' (shown, roughly, in red below). I've ...
8
votes
3answers
3k views

Calculating avg distance between two non-parallet lines?

I'm currently working on creating a data model that will allow the analyst to digitize two non-parallel lines of approximately the same length. Currently the methodology is to divide the lines into 11 ...
8
votes
2answers
4k views

Extracting centerline of a Complex-Polygon in PostGIS/Python

Any idea how to extract the centerline of the following polygon (Fig1) using PostGIS functions or Python modules? I was trying Voronoi Function but thats not helpful for this kind of shape. I want ...
10
votes
3answers
3k views

How to extract breaklines from a given DEM?

Breaklines are very useful for describing a terrain - for example to build an exact TIN. My question is, how to extract these breaklines from a given DEM? I calculated the curvature (vertical) - ...
5
votes
2answers
2k views

Convert polygon to line using ArcGIS Desktop?

I have a polygon representing a wall. How do I simplify this to a line representing the middle of the polygon using ArcGIS Desktop?
0
votes
2answers
2k views

How can i Calculate Road Width in ArcMap?

I have Road shapefile which is in polygon feature. I need to calculate the width of each road. Can it be done in ArcMap?
3
votes
2answers
1k views

How school catchment area analysis is done [closed]

In fact i am asking for the method and the data needed for determining school catchment area.Example is http://www.qgso.qld.gov.au/maps/edmap/. Probable Prerequisites: Catchment boundary must not ...
5
votes
1answer
212 views

Calculate Polygon Centerline with a LeastCostPath approach

I'm working on deriving the centerline of a polygon, similar to this question or this one, using a different approach. I'm 90% done with the task, but cannot reach the final step. My approach is to ...
2
votes
1answer
350 views

Manually digitizing roads vs. collapsing dual lines for centrelines

I am in the midst of doing a complete overhaul of our (abysmal) centrelines, and I was wondering how everyone creates their centrelines. We have a large rural area, and some of the roads meander all ...
1
vote
0answers
364 views

Create polygon center line with Python script [closed]

Does anyone have a stand alone python script that will find the center line of a polygon and output as a separate feature class? I have a basic ArcMap license 10.6 (no extensions) and I would like to ...
0
votes
0answers
146 views

Finding centrelines from polygons in R sf

Has anyone found a solution for turning polygons into centrelines using R? It has to be in R as I'm deploying it in parallel on a UNIX cluster. I've got as far as: library(sf) centreline <- ...
1
vote
2answers
56 views

How to find “empty” buffer?

So I have lines(road network) and buffers around them. I need to find "empty bufers" whose lines is missing (pic below). Lines have attributes of buffer width, but it is incorrect in some cases (does ...

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