arcgis-desktoplinepolyline-creationpythonr
I have an Origin-Destination table like this
Origin Destination Value
A B 10
B A 100
A C 120
...
For all the locations A, B, C… I have another table indicating their location (Lat and Lon)
Is there any way to draw two separate lines between A and B so that I can visualize the directionality and distinguish the flow volume between these two places?
Thanks!
I'm not certain I understand the entirety of your question. I do not think you need D3 for the task you describe.
You could define your polyline directly in GeoJSON, and provide it as a GeoJSON file using an URL. Take a look at the .url and .geoJson methods at http://polymaps.org/docs/geoJson.html#po.geoJson -
As for the styling, you should be able to style your polyline using css. In Polymaps, assign an id to the layer:
map.add(po.geoJson()
.url("...")
.id("roads"));
then, provide a style in the map css file:
#roads path {
stroke: rgb(255,0,0);
fill: none;
stroke-width: 1px;
vector-effect: non-scaling-stroke;
}
This should be possible without any plugin using the default Processing tools, particularly Distance to nearest hub:
Best Answer
FlowMapper Plugin for QGIS (v0.2.3) can exactly do what you want. Using a white space delineated interaction matrix (txt) and a set of coordinates (txt) you can create two way flow line segments.
e.g. Assuming that we have 3 nodes A, B, C
txt input coordinates file (long, lat)
40.789 30.987
40.123 30.456
39.678 29.741
txt interaction square matrix (From node -> To node)
0 200 300
50 0 150
10 20 0
http://plugins.qgis.org/plugins/FlowMapper/