Geography Reference
In-Depth Information
each point. Make sure to indicate scale and include a legend that explains
the symbols you used.
4. Make a Network Graph of Locations and Travel Times
In this step, you will create a schematic drawing of the seven locations from
step 2 on a new sheet of paper. You should arrange the locations in a fash-
ion similar to the graphs showing topology.
Because this network shows travel time, you want to show the distance
between locations as a scale equivalent. Each location should be labeled.
Make sure to determine the appropriate scale before drawing the graph:
assuming the shortest travel time between locations was 5 minutes and the
average travel time was 12 minutes, you want to have a scale that fits all
your points on a 8.5
″×
11
″
sheet of paper. If the maximum travel time is 30
minutes, a scale of 1
″
= 5 minutes will need 6
″
on the paper.
You should do
this in pencil at first in case you need to make changes.
5. Draw a Network without Scale
Based on the network graph from step 4, draw a network graph that is not
scaled, but only shows the connectivity between locations. You should still
arrange the locations in a fashion similar to the graphs presented in the lec-
ture on topology, but don't scale the distances by time.
6. Evaluate Your Network Graph
Using Euler's Characteristic,
v
-
e
+
f
= 2 (evaluate your graph from step 5)
where
v
is the number of vertices of the polyhedron,
e
is the number of
edges, and
f
is the number of faces (remember that vertices are your loca-
tions and intersections of edges, edges, the connections between vertices,
and faces are the areas bounded by connections). Note: Always add one
face for the surrounding area of the network.
The value should be 2. If it is not, check your graph to make sure you
have included all locations and added vertices where paths meet.
Questions
1. Is your graph all on the same elevation? If you need to consider multiple
elevations—for example, to show overpasses or bridges—how would that
change the connectivity of your graph? What is the term used for graphs
that are on the same elevation or level?
2. Copy your scaleless network graph to another sheet of paper and indicate
how you would traverse the network in a single trip. If you can't, indicate
which node you would have to cross twice.
3. How long will it take you to get around your network once?
4. You have a geographic map, a scaled network graph, and a scaleless net-
work graph for a portion of the campus. What is the map better for and
what is the graph better for? What does the use of a scale add or detract?
Is it necessary to show network connectivity? Please identify two activities
for the each map and each graph.
Search WWH ::
Custom Search