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5
votes
1answer
125 views

How to assign correct flow direction to stream network polylines?

I would like to create a map showing the results of watershed analysis as well as the resulting stream network with flow direction. I have a stream network which has been created from the flow ...
1
vote
1answer
46 views

How to create a barrier feature class to use in a geometric network?

I am working with the NHD and need to isolate stream segments upstream of barriers. I have too many barriers (thousands) to do this manually using the Geometric Network barrier tool on the toolbar. ...
0
votes
1answer
141 views

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

I'm writing my final year B.Sc thesis on transportation (pattern of passenger flow from a bus terminal to several destinations). I intend using a distributive flow line method of spatial movement ...
1
vote
1answer
116 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 ...
0
votes
1answer
107 views

Flow mapper plugin failed

I want to create a desire line with the Flow Mapper pluginwith qgis ver.2.1 . After I did it has failed. The data that I use as an attachment below. There may be error procedure I have done?. ...
0
votes
1answer
165 views

Flow Mapping Lines by Magnitude

I am attempting to map the flow of remittances into Japan using the FlowMapper plug in in QGIS. When I use the Style-->Advanced--->Size Scale field--->magnitude command the lines become so thick and ...
2
votes
0answers
64 views

How to add flow arrows to groundwater table map?

After I had created groundwater table map, I tried using 3D Analyst>Steepest Path to add groundwater flow arrows to the map. However, it didn't work. Would you please let me know how can I add these ...
0
votes
1answer
43 views

Where can I find human migration data? [closed]

I am looking for data to create a flow map. I need data showing the migration of people either within a country, or internationally.
0
votes
1answer
115 views

Does software exist to create Flow Maps (for migration of people) on Mac?

Does anybody know a good, and easy to use, software to create flow maps? I want to create flow maps for showing the flow of people between places (migration). The software has to be compatible ...
1
vote
1answer
48 views

When was MFD renamed to FD8?

According to my understanding, the Multiple Flow Direction (MFD) algorithm was originally defined in The Prediction of Hillslope Flow Paths for Distributed Hydrological Modelling using Digital Terrain ...
4
votes
1answer
232 views

Understanding percentage drop-raster (flow direction-tool)

I'm creating a Topographic Wetness Index using a python script (http://arcscripts.esri.com/details.asp?dbid=16750) As I don't want this just to be a blackbox, I'm trying to understand the different ...
7
votes
1answer
381 views

How to create arrows lines automatically on ArcGIS, for a thematic map of directed flux?

I need to create a Map with the Import and Export Flux between countries. I have the needed data in my table. But I wish to know if there is any tool or extension which allow me to create those ...
2
votes
2answers
392 views

How to display arrows on pipes from upstream to downstream using QGIS?

I am trying to display arrows on pipes of a sewer network so their direction is from upstream to downstream edges of the pipes. I have managed to display those arrows on a polyline layer (which is ...
1
vote
1answer
425 views

Determine use of pipes in a geometric network

I am trying to understand how to use the Geometric Networks in ArcGis 10.1 For the purpose of my experiment, I built a simple network composed of a few connected pipes, one source (left triangle) and ...
2
votes
1answer
120 views

QGIS link values longer than the links?

Can you please help me to correct link rapresentation when the thickness exceed the links. In the image you can see the value on two consecutive links that generate a bad view. I think it depends on ...
9
votes
1answer
1k views

How to create desire lines in QGIS?

How can I show the flow coming from an Origin-Destination matrix as desire lines? I need a result like the one in the picture below. I need to scale them proportionally to its value (coming from a ...
4
votes
1answer
792 views

How to make the thickness of traffic volume flow symbology proportional to traffic counts?

I can scale the bandwidth proportionally to the traffic volumes; however, I cannot show the directionality of the movements. Volumes for directional moves are stored in two different columns of a ...
1
vote
0answers
318 views

Arrow flow lines from a contour map

using QGIS (or even GRASS) is it possible to label a contour lines shape with arrows that indicate the flow direction? Briefly: I have a point shape with elevation values. I make an interpolation map ...
7
votes
5answers
478 views

How to get started with mapping the flow of natural gas using GIS?

I'd like to get involved with GIS, im a marine engineer and clueless about it and although i've tried to research it, I'm overwhelmed by the amount of programs available & information. I wanted to ...
1
vote
1answer
346 views

Flow mapping visualization using a road layer

I am trying to illustrate travel using a flow map on a road layer. My data is: city of origin destination number of travelers I would like to use a polygon city layer (or point) and a road layer, ...
5
votes
2answers
330 views

R packages for deriving spatial clusters from origin-destination matrix

I have a matrix of origin-destination flows and I am trying to figure out the best way to derive X number of functional spatial clusters from the data. I haven't done this particular type of analysis ...
2
votes
1answer
104 views

Display freight volume by city on a geographic map

I have been requested to show on a geographic map the volume (in meters cubed m3) of freight (parts) that ship to various cities (Canada/USA). The idea is to show which cities receive the most freight ...
13
votes
7answers
3k views

Creating trade flow maps in ArcGIS for Desktop (or any free software)?

I am trying to represent trade flows on a world map where the size and direction of arrows indicate the exports/imports of a given country. This type of map is commonly found in magazines and ...