Questions tagged [network-analysis]
The network-analysis tag has no usage guidance.
55
questions
-1
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0answers
23 views
All possible routes from point case study
ı can create isochrones from a point that shows catchment area as minutes interval. but ı want to see all possible routes on the map to see the distribution of the roads and why isochrones came out ...
0
votes
0answers
22 views
Any way to run network analysis (Closest Facility) on QGIS without creating a huge OD matrix?
I'm trying to run a closest facility analysis project on a Linux system computer, so far the available installed GIS software are QGIS and GRASS. I usually use ArcGIS so I'm not that familiar with ...
0
votes
1answer
27 views
Generating edge table from nodes using QGIS
I generated nodes from a line road network in QGIS and uploaded them to PostgreSQL/PostGIS. I would really like to use them for network analysis and I am wondering if anyone knows if, from these ...
2
votes
1answer
25 views
Considering distance in network analysis (Gephi)
I have created a set of nodes (archaeological sites) and ties (connected via certain geographical distances), exported from QGIS. I now have an edge list with weights (distances). Gephi, however, sees ...
0
votes
1answer
25 views
ArcGIS Online Routing service
I have a serious confusion understanding the link: http://sampleserver6.arcgisonline.com/arcgis/rest/services/NetworkAnalysis
This is the default format to access the routing service, but this isn't ...
1
vote
2answers
61 views
Alternatives to Network Analyst in ArcGIS for utility network tracing
I have feature classes of lines (roads) and two types of point feature classes (let’s call them “sources” and “sinks”; there are many sinks for every source). For every source, I need to trace the ...
1
vote
1answer
25 views
Keep line attributes in QGIS Network Analysis - Shortest Path
I'm running a simply Shortest Path task from the Network Analysis toolbox in QGIS, but it seems that the output doesn't transfer the line attributes, only the start layer attributes. I need the road ...
-1
votes
1answer
34 views
Isochrones in R closing roads based on spatial overlays [closed]
I am interested in comparing isochrone maps based on different road closure scenarios. I have some polygon layers that I would use to "remove" closed roads (e.g. due to flooding). I am aware ...
0
votes
0answers
36 views
Network analysis using QGIS
I have a water pipe network consisting of segments with attributes of pipe dimension, material of pipe and street location.
I need to create another network with different segments grouped by these ...
1
vote
1answer
44 views
Dividing range of territory into squares with different colors from points with accident information using QGIS [closed]
I have points with accident information and I need to divide the range of my territory into squares with different colors.
And the coloring of the square must depend on how many points (accidents) lie ...
3
votes
0answers
44 views
Shortest line network route between clusters of points and the cluster centroid
I have a point layer containing clusters of points (premises) that I have grouped using a clustering algorithm (the clusters each having their own unique ID which I have used to create convex hull ...
1
vote
0answers
49 views
pgRouting - Assigning source and target from different point layers (AOIs) for network analysis
I'm new to pgrouting and normally use ArcMap to conduct any sort of network analysis. I have created a simple shortest path network along a downloaded OS Mastermap road network using pgRouting. ...
2
votes
1answer
35 views
Counting population from grid based on travel time
I have a dataset that consists of the 125x125m grid with population count and time travel vector layers (for example, 5, 10, 15 mins by car). I'd like to mark every grid that's within the buffer range ...
2
votes
1answer
54 views
QGIS, Number of Lines through a Point (of over lapping multiline shapefile)
I am doing an irrigation system analysis, for that there are multiple overlapping lines are passing through multiple points.
one number of line means a unit volume of the system,
and point means a ...
2
votes
1answer
46 views
Representing stationary elements in flow map
I have been trying to make flow maps to show social relationships between people geographically based on baptismal records. I have successfully made maps using https://anitagraser.com/2019/05/04/flow-...
8
votes
1answer
182 views
Routing with several stops using QGIS
I have point layer and a network (segments) stored in a geopackage and using QGIS. The number of points and their ids are always different.
What I need is to get a route from first to last points but ...
3
votes
1answer
67 views
Subtracting line features in QGIS
Doing network analysis in QGIS. This is where I came from:
Start situation: + 600 points with fid and 1 relevant attribute. Also road network data.
First step: ran "network tools - service area (...
2
votes
0answers
46 views
Shortest path from one to many points to return path id's using QGIS
I'm trying to find the shortest path between many points (pink) and one point (light green) using a network of lines (dark green). For each path found I need the list of line id's that make that path.
...
1
vote
0answers
30 views
Network Analysis Shortest path with original line segments as output
I've managed to batch run the shortest path algorithm and the shortest route (point to layer) in the output is perfect, except that I really need the individual attribute tables of the line segments ...
0
votes
0answers
17 views
Addresses, Geolocation and driving times
I have a list of addresses (Germany and Austria) that I
want to display on a map (easy)
from a random point on the map obtain a list of all the addresses that are within a driving time of x mins (...
0
votes
0answers
31 views
Seeking library to do Spatial Network Analysis using QGIS
I am new doing network analysis out of R, I would like to know which is the best library to fulfill a spatial network analysis with Qgis?
I have been trying with Qnetwork, but I have problems by ...
2
votes
0answers
30 views
How to cluster points based on network traveling time to a common location?
I have a set of points that I need to divide into N different clusters. I know how to do this with the arithmetic distance, but in this example I need to cluster them based on the network traveling ...
1
vote
0answers
63 views
Balancing multiple supply and demand locations in QGIS
I am looking for a way to balance supply and demand with respect to distance, between two vector layers in QGIS.
I have two vector layers 50x50m grid
Supply (The red negative values)
Demand (The ...
3
votes
1answer
518 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
38 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
168 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
33 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 ...
1
vote
1answer
101 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
1answer
554 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 ...
4
votes
1answer
488 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
122 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
221 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
246 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
112 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
69 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 ...
2
votes
0answers
207 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
69 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
228 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
233 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
233 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
669 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
524 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
98 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, ...
1
vote
0answers
281 views
Constructing graph from geometries and tieing points to graph after graph creation using PyQGIS network analysis
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
312 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
5k 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
680 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.
...
5
votes
2answers
646 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
619 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
67 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. ...
