Questions tagged [flow-map]

A map designed to show the direction and/or volume of a resource moving between origins and destinations. Note this tag is for the cartographic representation of such data.

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QGIS: determining the ice divide on a small ice cap

I have a GeoTIFF file with the surface elevation of a small ice cap. The ice cap has an ice divide, where the ice diverges. Part of it flows towards a glacier in the north, the other part flows ...
user236934's user avatar
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1 answer
145 views

Calculating flow path length in R

I am currently trying to calculate the flow path length in a DEM towards a streamnetwork. My desired outcome would be a raster with values of how long the flowpath to the nearest streamcell would be ...
same11's user avatar
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Arrow pathways in QGIS using geometry generator

I’ve been trying to draw trade pathway arrows following the fabulous posts from @underdark for Flow Maps on QGIS from 2019-05-04 (https://anitagraser.com/2019/05/04/flow-maps-in-qgis-no-plugins-needed/...
butter-milk's user avatar
1 vote
1 answer
193 views

Creating radial flow diagram for multiple lines with same start and end point using ArcGIS Pro

I have a dataset of start points and end points that I would like to connect. I used "XY to line" tool in ArcGIS Pro. Using this approach, records that have same start and end point will ...
john ed's user avatar
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How to plot arrow linestyle using GeoPlot sankey?

I am plotting line directions from the US to other countries on a map. I have both geo points of originators and destinations. I use gploy.sankey, however, I am unable to add arrows at the end of the ...
S Hendricks's user avatar
3 votes
1 answer
445 views

What is the most efficient way to create millions of lines using Python from coordinates? [closed]

I am trying to create a flow map and I have 150 million rows of data. I have tried to use QGIS's Virtual Layer (described in Creating virtual layers using Python and export them without using QGIS UI) ...
sjp_1989's user avatar
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Creating virtual layers using Python and export them without using QGIS UI

I am trying to create a flow map and have 5000 nodes and millions of edges. I've used SELECT StartID, DestID, Weight, make_line(a.geometry, b.geometry) FROM edges JOIN nodes a ON edges.StartID ...
sjp_1989's user avatar
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ArcGIS tool which shows all cells a point flows into?

Is there a tool that is effectively the inverse of flow accumulation of a pour point - as in, if I have a specific point that is the site of potential pollution, is there a tool which will show all ...
dre627's user avatar
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2 votes
1 answer
86 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-...
Catherine LaVoy's user avatar
4 votes
1 answer
1k views

QGIS: Making flow-map, with curved arrows of different colours and varying sizes

I have a shape file for the World Map and the following data in text file (Added as delimited text layer): I would like to use QGIS 3.10 to achieve three things: a) To make a flow map to have CURVED ...
Sarah Hagg's user avatar
1 vote
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763 views

How to add an arrow symbol or marker to a QGIS legend?

I'm currently making a map of student migrations in the Netherlands, including a legend. Here's what I made so far: I'm sorry for the blurriness on the map. I'm also adding a legend in the top right ...
Max Muller's user avatar
3 votes
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Adjusting buffer between arrows and both begin and end points separately [duplicate]

I'm currently making a map of the Netherlands in which the flow of student migrations upon or shortly after their graduation is depicted. Here's what I've made so far: I'm getting a bit more pleased ...
Max Muller's user avatar
1 vote
1 answer
497 views

NameError: global name is not defined when performing task with FlowMapper in QGIS

I'm using QGIS 2.8 and I'm trying to apply the FlowMapper plugin to create a visualization. I aim to follow the instructions in this blog post and this GIS.SE question, but something seem be going ...
Max Muller's user avatar
0 votes
1 answer
99 views

Incorrect creation of flow direction raster from interpolated DTM in ArcGIS

I have DTM for quite small area (400x200 meters) which was interpolated from elevation points. I want to create raster which will show water stream (not arrows but basically slope and river flow map - ...
daky's user avatar
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1 answer
154 views

Generating flow map with varying width and alpha level which accumulates using ArcMap

I'm using ArcMap. I have a very large line shapefile with ~300'000 links which all have the attribute flow (a numeric variable from 0-200). My goal is to display a map like in this example (produced ...
Yves's user avatar
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6 votes
1 answer
2k views

Curved arrows in QGIS using geometry generator

I use QgGIS 3.10 and this tutorial https://anitagraser.com/2019/05/04/flow-maps-in-qgis-no-plugins-needed/. I am able to create lines of varying thickness and color depending on the weight of the ...
Wilcar's user avatar
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3 votes
1 answer
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Virtual Layer Symbology in Legend

I am new to QGIS and I'm using QGIS 3.8 on a Windows machine. I'm creating a commuter flow map using a virtual layer similar to the one Anita Graser has created here. When I try to add in a legend all ...
gernworm's user avatar
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2 votes
1 answer
269 views

Making XY To Line not give shortest distance in ArcMap

I am creating a very simple map through XY to Line in AcrGIS. However, since the destination is New Zealand and located at the bottom corner of global maps it creates the following. Is there a way ...
Hank's user avatar
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5 votes
1 answer
1k views

Flow map of commuters using QGIS

I need to show in QGIS the a flow map of commuters in a municipality of Italy, Bari. In a CSV file I know the place they come from (a field called ORIG) and the place where they go (the field DEST) ...
Gabriele Di Palma's user avatar
2 votes
1 answer
799 views

QGIS Virtual Layer Join SQLite/ Spatialite

I am attempting to recreate a flowmap workflow from @underdark The first step involves joining a non-spatial edges layer to a spatial nodes layer: SELECT StartID, DestID, Weight, make_line(a....
mr.illington's user avatar
9 votes
2 answers
1k views

Adjusting flow map styles in QGIS 2

In one project, I am trying to adopt marvellous styles for flow maps created by @underdark. At this moment I have the following output Shapefile was created with the usage of Flow maps (Oursins) ...
Taras's user avatar
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1 answer
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ArcMap Flow Map lines get cut off

I am new to GIS and am doing a global flowmap using ArcMap 10.6. The flow lines from East Asia/West Pacific to the NE USA should cut off in the mid-Pacific (on far right of map) but instead continue ...
John's user avatar
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2 votes
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Creating a flow graph in QGIS 3.4

I attempting to make flow graph in QGIS 3.4, some thing like I have found several 'ways to do it' in QGIS 2.xx eg QGIS2.0 method I known its possible to get a line with arrows by just change the ...
Dave's user avatar
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2 votes
1 answer
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Flow map with QGIS 3 [closed]

I've used QGIS for many years and made great flow maps. But within QGIS 3 I can't find any flow making plugin like the ones in QGIS 2.X versions. Do you know how to do?
Arthur's user avatar
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6 votes
1 answer
152 views

Selecting or highlighting upstream elements

I would like to use the information from the Swedish SMHI related with their hydrological model elements (catchment areas) that have a Containment hierarchy structure, each element has the information ...
Marco's user avatar
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2 votes
1 answer
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How to offset lines in QGIS that share the same origin and destination

I have a set of lines in QGIS that represent travel between destinations. Some of these lines of travel overlap - for example, traveling from Rome to Paris, and then back to Rome, and then on to ...
auslander's user avatar
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1 vote
1 answer
245 views

Wrong results joining places to create flow map

I have to do a flow map (home->working place) for my area of interest (28 french cities). I get a database .dbf created by a french institute. I imported it into postgres/postgis. One row = 1 people. ...
user35117's user avatar
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6 votes
0 answers
280 views

show relations between polygons by highlighting polygons

Is it possible to show relations (for example traffic flow) between polygons (for example counties) by highlighting related polygons by doing a query on a start polygon using QGIS? Here is an ...
MrXsquared's user avatar
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3 votes
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854 views

How to calculate the distances to outlet along the flow path ?

I have created these raster files for a river basin: DEM Flow Direction Flow Accumulation I like to genereate a layer how it is shown in the picture below. I need the values for the distances from ...
A.V.E.'s user avatar
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5 votes
1 answer
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Legend of Flow Direction calculated with processing toolbox QGIS (SAGA)

I tried to figure out the legend of the output for flow direction when I use the QGIS processing toolbox function from SAGA (Channel network and drainage basin). I get a raster with values from 0 to 7....
Hansakwast's user avatar
1 vote
2 answers
4k views

Longest Flow Path in QGis

From a DEM of a watershed, how is possible to calculate the longest flow path? I know this questions has been asked before but I haven't found a complete solution yet.
rsuarez1's user avatar
1 vote
0 answers
296 views

QGIS flowmapper migration arrows from origin X to destination X - possible?

I have a question about QGIS with the Flowmapper plugin. I am trying to visualize some real estate data. I have data about consumers who are actively searching for housing and what I want to visualize ...
rovisonn01's user avatar
3 votes
1 answer
485 views

How do I separate/visualize polylines that overlap? (Show them next to each other)

I have a network of polylines between multiple nodes. All nodes are connected with lines in a two-way system (A->B and B->A). I want to show all the lines at the same time, but the problem is that ...
RoKro's user avatar
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1 vote
1 answer
533 views

Inputting Multiple XY Data from a .csv file in ArcMap to Create Flow Lines

I am doing a project where I need to create a flow map in ArcMap 10.4.1. I have imported the data from an Excel spreadsheet that I put together. The problem I am having is that when I Create A ...
SAgardy's user avatar
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2 votes
0 answers
126 views

Multiple flow distance rasters produce low distance values along catchment boundary [closed]

My problem makes use of ArcGIS tools generally and Spatial Analyst in particular, but my question has more to do with hydrological modelling and working with DEMs. My goal is to obtain flow distance ...
bcaradima's user avatar
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1 vote
0 answers
101 views

Zip codes, Geo coding, Joining/relating

I have a file of Tennessee zip codes and another excel file including 600,000 origin and destination addresses with zip codes and trip purposes. Since I cannot Geocode all 600,000 addresses, I ...
Saman Tabrizizadeh's user avatar
1 vote
1 answer
496 views

Export shapefile of a flow map with arrows indicating their direction in R

How can I insert arrows on flows and export flows map with arrows indicating their direction in R? I know that I can use the arrows command of the maptools library to "print" an arrow in line with ...
Wisley Velasco's user avatar
3 votes
0 answers
104 views

QGIS - Flowmapper uses only first node

Running on QGIS 2.14.2 for Mac OS X. I installed Flowmapper and prepared the three files required in txt format (node coordinates, node names, matrix). Flowmapper imports the files OK through its ...
user80455's user avatar
1 vote
0 answers
208 views

Map library supporting linestring curve rendering to produce flow map

Is there some function/plugin for any javascript map library (OL, leaflet, ArcGIS API for JS) to render WFS or Geojson LineStrings not as simple line but as curves? I want to make mobility flow maps ...
dkocich's user avatar
  • 404
3 votes
1 answer
671 views

"IndexError: list index out of range" error when using FlowMapper plugin in QGIS 2

In QGIS 2.12.0 Lyon I have a problem while using the FlowMapper plugin. But I don't know why. This is the message: Traceback (most recent call last): File ".../python/plugins\FlowMapper\...
Nerv's user avatar
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1 vote
0 answers
95 views

How can I run QGIS Flowmapper in batch mode?

I installed and used the Flowmapper plugin in QGIS. It works perfect. However, I have numerous matrices that I need to create desire lines. Doing it one by one is pretty tedious so I wanted to run ...
Ash Catchem's user avatar
1 vote
1 answer
2k views

Creating flow map with matrix table using QGIS?

I have a map http://prntscr.com/95zoyh and also data in a table (matrix table ) and I would like to have a map with different weight arrows depending of the data. Is that possible to do using QGIS?
Carlos's user avatar
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3 votes
1 answer
230 views

Flow Mapping Data?

I have recently started experimenting with QGIS's flow mapping functionality. I am having trouble finding any origin/destination data online and I'm hoping someone can help? It can be for anything. ...
Dunuts's user avatar
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10 votes
2 answers
6k views

Creating flow maps in QGIS

I have several records from a survey and would like to show flow map from places mentioned in the survey. I have all places mentioned georeferenced and some records mentioned no places and others ...
Carlos Rivas's user avatar
2 votes
0 answers
626 views

Representation of road networks at junctions when line width is varying with attribute [closed]

I have a road network and for every road segment the average number of daily traffic. I need to draw a map where the line width for each road segment is proportional to the daily traffic. I can do ...
chkaiser's user avatar
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1 vote
0 answers
137 views

How to make input data matrix in flowmapper

I have problem with using flowmapper. I'm confused, how do I enter a text record? Can you give me an example of an appropriate text file? I've been doing interpolation and made a contour of the ground ...
user45114's user avatar
3 votes
1 answer
2k views

Creating migration flow map using MapInfo?

my first post on this forum :) Being a beginner in Mapinfo, I didn't find any tutorial on creating a thematic map of migration flows, something like; or I tried Arrow40 extension but couldn't get ...
numediaweb's user avatar
0 votes
1 answer
247 views

Error in creating a flow map

I'm trying to create a flow map using FlowMapGenerator. My map is trying to visually show the movement of professional soccer referees to various venues throughout the season. I plan to have several ...
Jay's user avatar
  • 49
5 votes
6 answers
2k views

What are good colour schemes for large density flow maps?

I came across nice QGIS tutorial for mapping flows. In contrast to Alasdair, I have zero talent in colour choice. Can anybody recommend some good starting points for nice colour schemes (I'd be ...
radek's user avatar
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0 votes
1 answer
303 views

Flow mapper not working?

I am trying to run the test files for flow mapper plugin in QGIS but I run into an error message.
Liliana Q's user avatar