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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17 views

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 ...
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1answer
191 views

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

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) ...
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53 views

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 ...
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9 views

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 ...
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1answer
44 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-...
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1answer
152 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 ...
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104 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 ...
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27 views

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 ...
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1answer
57 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 ...
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1answer
40 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 - ...
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136 views

Creating a Origin-Destination flow map with Non-Spatial dataset

I am working on a project where I am trying to learn some geopandas. The dataset that I am using is the LEHD Origin-Destination Employment Statistics that gives you a csv that has a work/home geoid ...
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46 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 ...
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1answer
528 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 ...
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1answer
102 views

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 ...
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1answer
190 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 ...
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1answer
944 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) ...
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1answer
431 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....
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2answers
744 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) ...
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1answer
60 views

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 ...
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875 views

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 ...
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1answer
1k views

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?
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1answer
119 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 ...
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1answer
2k views

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 ...
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1answer
211 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. ...
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196 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 ...
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533 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 ...
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1answer
2k views

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....
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2answers
2k 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.
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256 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 ...
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1answer
378 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 ...
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1answer
373 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 ...
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105 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 ...
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84 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 ...
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1answer
327 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 ...
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96 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 ...
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128 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 ...
3
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1answer
621 views

FlowMapper plugin Error in QGIS 2.12.0 Lyon

I have a problem using FlowMapper plugin. But I don't now why. This is the message: Traceback (most recent call last): File ".../python/plugins\FlowMapper\flowmapper.py", line 2656, in run flowpyv07....
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92 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 ...
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1answer
1k 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?
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1answer
208 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. ...
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2answers
4k 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 ...
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0answers
502 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 ...
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123 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 ...
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1answer
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 ...
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1answer
212 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 ...
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6answers
1k 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 ...
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1answer
269 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.
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2answers
892 views

Curved Arrows showing trade ARCGIS 10.2 [duplicate]

I have 10 points that represent the centres of countries. I want to show with arrows the flow (some kind of trade) from one country to another. The way that my table of attributes is constructed is ...
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1answer
1k views

Creating distributive flow line map showing movement of passengers from bus terminal to several destinations? [duplicate]

I'm writing my final year B.Sc thesis on transportation (pattern of passenger flow from a bus terminal to several destinations). I intend to use a distributive flow line method of spatial movement ...
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1answer
1k views

how to create a map with oneway flows using FlowMapper for QGIS

my plan is to create a map that shows the top 50 (by amount of passengers) international flights departing the United States (e.g. New York -> London, Honolulu -> Tokyo...). I want to use the plugin ...