|
|
| GeoCommunity Mailing List |
| |
| Mailing List Archives |
| Subject: | [gislist] Distorted Maps |
| Date: |
01/04/2006 02:10:01 PM |
| From: |
DickBoyd .. aol.com |
|
|
Everyone is familiar with maps that have scaling factors distorted to
emphasize some feature. Such as elevation at ten times the magnification of
horizontal scaling to emphasize grades. Or population density, etc.
Does anyone know of a time distorted map? Let me explain.
Most cities are laid out in grids with streets running at right angles.
Eastings and northings are presented to the same linear scale. But for a traveler,
do the trip times have the same linear scale? If north-south trips can be made
at twice the speed as an east-west trip, the "rubber sheet" distorted map
would show the city more as a linear one dimensional map. If time were the
scaling factor, the map would make the east-west streets look twice as long as the
north-south streets. If speed were the scaling factor, the north-south streets
would look twice as long as the east-west streets.
What good is such a map? I had in mind an audience of planners or traffic
engineers. If the criteria is to place things close in time, that may not be the
same as placing them close in distance. The distorted map would highlight
shortness in time.
The speed difference may be a time of day phenomenon. Traffic engineers could
capitalize on the time sensitivity of the direction of flow, coupled with
time of day origin-destination studies to optimize signal timing, or to advise
travelers of fastest routes.
dickboyd@aol.com
_______________________________________________
gislist mailing list
gislist@lists.geocomm.com
http://lists.geocomm.com/mailman/listinfo/gislist
_________________________________
This list is brought to you by
The GeoCommunity
http://www.geocomm.com/
|
|
Sponsored by:
For information
regarding
advertising rates
Click Here!
|
