Questions tagged [network-analysis]
The network-analysis tag has no usage guidance.
32
questions
1
vote
1answer
51 views
Seeking Transit Feed (GTFS) Toolset for QGIS?
I can see that ArcGIS has a transit feed toolset that enables converting the .txt files from GTFS data directly into usable feature classes for GIS.
I am trying to develop catchment areas in the ...
0
votes
0answers
32 views
How to add additional weight to shortest path?
I am calculating shortest bath between two points. I need to add an additional feature eg. air toxicity in my calculation, so that the shortest path calculated takes into account the air toxicity and ...
1
vote
0answers
67 views
QGIS v. ArcMap Network Analysis Isochrones [closed]
I am looking at developing catchment areas based on a street-lines feature class against various bus stops to find an ideal catchment area which can then be converted and run in a simulation. The ...
1
vote
0answers
23 views
Which sensitivity analysis is most suitable on cost factors in route planner? [closed]
I am working on developing a route planner with alternative impedance/cost factor (safety of the route).
I am building the application mainly in pgRouting.
As a final step I would like to perform ...
0
votes
0answers
25 views
GIS Tool for Evacuation Road Routes
Looking for an ArcGIS Desktop tool for coordinating evacuation routes via roads for a given area (polygon). Ideally would like to have certain routes (polylines) labelled as Primary (Highway, etc), ...
1
vote
1answer
62 views
PyQGIS3 retrieving points from a shortestpath graph
I'm upgrading some code which worked with QGIS 2.18 to now work with QGIS 3.4.5 and had the following snippet working to retrieve a set of points from a graph created by the QgsGraphBuilder function:
...
5
votes
0answers
122 views
Cumulative value/cost along shortest distance roads in QGIS
I have a road network linking multiple (ca 1830) agricultural production regions to several ports (ca 12). (lines in the pic below are roads, small black dots centroids for producing regions and ...
3
votes
1answer
235 views
Batch distance calculation with v.net.distance
I have three shapefiles:
one containing destinations
the second containing postcodes
the third containing the road network
I want to calculate the distance between the postcodes and destinations ...
1
vote
0answers
92 views
Dijkstra’s graph returns infinite cost in QGIS?
I borrowed some code from the Network analysis library, modified as appropriate. The goal is a program that measures the distance between a location and a train station.
Eventually, this will loop ...
3
votes
0answers
122 views
Recognizing when road is uphill and when downhill using QGIS?
How do I automatically recognize and cut roads of a great network in places when the roads are changing the path uphill and downhill using QGIS?
I have a geotiff dem.
Schematic truck's transport
0
votes
1answer
136 views
Line network integration analysis in QGIS
I want to analyse how integrated a line (e.g. road, stream) is within a network.
I want to perform the "integration" type of analysis identified by Javadi (not the connectivity or choice analysis) i.e....
1
vote
0answers
56 views
V.Net.Allpairs not working
I have two layers: (1) point layer (city centroids) and (2) OSM road shapefile layer. I want to know the distance to take from one city to another. I want to output a matrix like this:
from\to ...
-1
votes
1answer
54 views
Speeding up sDNA analysis [closed]
I am trying to analyze several cities around the world (including major cities like London, Tokyo or Beijing) using different centrality measures with varying radiis.
The problem with this is that ...
1
vote
0answers
144 views
Calculation of fastest path with in network analysis by qgis 3.0
I have a road network (with speed limit) and different points connected to the roads. I would like to measure the distance between several points along the roads. Basically I want to do shortest path ...
2
votes
2answers
65 views
Checking all 100 km routes through network for proximity to facilities?
I am only interested in software agnostic answers to this question.
We're making a coverage analysis where we need to find out which sections of a road network are covered by EV charging ...
3
votes
0answers
180 views
Network analysis: shortest path to 'visit' all polygons
I'm totally new to QGIS but I really like it and would like to solve something more elaborated. I found a lot of threads and tutorials about how to solve the traveling salesman problem with QGIS but ...
2
votes
0answers
182 views
QGIS Network analysis/routing module
in QGIS I have to draw a scheme ( kind of CAD) that represents electrical circuits.
The scheme consists of points and lines elements, with alphanumeric attributes associated.
The starting point and ...
2
votes
1answer
173 views
QGIS network analysis, points on graph cannot be reached
Using QGIS 2.18.14, I try something around with qgis.networkanalysis module as described here: https://docs.qgis.org/2.18/en/docs/pyqgis_developer_cookbook/network_analysis.html
director = ...
2
votes
1answer
384 views
Calculate distance matrix based on network
I have the following layers in QGIS:
origins points
destination points
a layer of lines that is the route
I want to calculate the matrix with the distance from origin to destination using Network ...
3
votes
1answer
191 views
Dividing NetLogo world into two parts
I'm working with NetLogo now and I have to divide my 'world' into two parts. As you can see in the picture, my world is already divided into two parts by the river. However, my turtles still cross the ...
2
votes
1answer
68 views
network analysis that includes user defined nodes
I want to make network analysis using python. I want that user must be able to select point of interests and calculated route must contain that points.
For example between start and end nodes user, ...
2
votes
0answers
218 views
PyQGIS network analysis: Construct graph from geometries and tieing points to graph after graph creation
I am solving some Euclidean shortest path problems, thus I create my lines/arcs myself. Following code from PyQGIS cookbook I need to import a vector layer to start building a graph:
vl = qgis.utils....
2
votes
0answers
251 views
Convert node data to lat/ long > DBF to CSV conversion
I have a DBF table with nodal data locating cycle injuries in Portland, OR. I'd like to convert the table to a .CSV. Transferring the attribute data isn't a problem, but I'd like to get lat/long ...
4
votes
1answer
4k views
Network analysis using QGIS?
I'm working on my bachelor thesis right now and I want to find a catchment area for different bus stops. Is there a function in QGIS where I could use a point layer as input, use ways as distances and ...
1
vote
1answer
461 views
QGIS Least Cost Distance Points to Destinations via Roads
I have a layer of starting points (people's residences) and a layer of destination points (stores). I also have a roads layer with a cost field calculated from distance and speed of each segment.
...
4
votes
2answers
482 views
Properter to get travel time as cost for network analysis
What I want to do is calculate travel times between points within a road network. I know there are options with GRASS (via v.net) and pgRouting (and possibly many more). I intent to stick to the ...
2
votes
2answers
444 views
QGIS Network Analysis: QgsLineVectorLayerDirector.makeGraph(), attribute type QVector not available
relates to QGIS 2.14.6LTR on Win10, PyQt Version 4.10.2
When trying to makeGraph() on QgsLineVectorLayerDirector as described in the "QGIS Network analysis library" documentation (http://docs.qgis....
2
votes
0answers
63 views
'Find Nearest' Equivalent in QGIS?
I'm a new user to QGIS, trying to solve a problem that I've encountered in ArcGIS Online. I want to run a 'Find Nearest' analysis, however the number of points I'm routing from is greater than 1,000. ...
3
votes
0answers
104 views
Calculating a specific distance from points along a network - GRASS
I'm currently using the v.net.iso function in GRASS (no access to network analyst in ArcMap). Does anybody know of a way to export the result to shapefile so that you have an individual line feature(s)...
1
vote
0answers
177 views
Network analysis not working correctly in GRASS GIS? [closed]
I have a problem with the Network Analysis function v.net.iso in GRASS. I tried it so many times but the function doesn't work correctly.
I tried to calculate isolines via the function v.net.iso, ...
5
votes
4answers
2k views
Using python QGIS network analysis library to calculate short path based on speed and distance?
I want to calculate and show short path from starting point to an end point in a qgis python plugin.
in my research i stopped by an article about QGis network analysis library; http://www.qgis.org/en/...
5
votes
2answers
3k views
Are there any open source network analysis tools? [duplicate]
A researcher in my field* recently created an "Urban Network Analysis Toolbox", an ArcGIS extension built upon Network Analyst. It calculates a number of measures on urban networks, such as ...
