Graphics Reference
In-Depth Information
DFW,23763,23752,47515,17,19,Dallas/Fort Worth
International,
32.89694444,...
LAX,19060,19052,38112,14,14,Los Angeles International,
33.9425,-118.4080556
DEN,19028,19006,38034,21,25,Denver
International,39.86166667,
-104.6730556
...
edgedef>Origin VARCHAR,Destination VARCHAR,weight
DOUBLE,Avg
Arrival Delay (min) DOUBLE
BOI,SUN,1,0
SFO,SUN,20,14
SLC,SUN,137,19
ATL,SAT,332,9
BNA,SAT,57,15
...
Open the GDF file in Gephi, choosing the default directed graph option
and letting Gephi rescale the weighted links to reasonable widths. Once
the graph data file is opened, the first step is to arrange the airport nodes
according to location.
Choose the Geo Layout and review the options a little more closely this
time. For this data, geography will be preserved with more accuracy. The
layout should discover the latitude and longitude columns and select them
automatically. The projection determines how coordinates on the spherical
earth are flattened into a two-dimensional representation. The default
Mercator projection will work fine for the U.S. data here, as will the other
defaults. If you were instead mapping global data, consider an alternate
projection that has less spatial distortion at the poles.
ClickRuntoarrange thenodesgeographically. Next,usethedragtoolwitha
relatively large-diameter drag dot to pull in states and territories outside of
the mainland United States (such as Alaska and Hawaii) for more efficient
use of space, as shown in
Figure 13-9
. Move Guam from the far right of the
map to the Pacific Ocean on the west, near Hawaii.
