|
|
| GeoCommunity Mailing List |
| |
| Mailing List Archives |
| Subject: | [gislist] Reilly polygons |
| Date: |
01/05/2005 06:45:01 PM |
| From: |
Harsh Prakash |
|
|
I am looking for clues on the programming that goes into the construction of Thiessen polygons. I am trying to construct polygons based on Reilly's Law for mapping of trade areas which is based on the Gravity Model:
IF
*--------|------*
A X B
<--d(a)-->
<--d(ab)------->
WHERE
A = Jurisdiction A
B = Jurisdiction B
X = Market Boundary
Pa = Population of A
Pb = Population of B
THEN
d(a) = [d(ab)]/[1 + sqrt(Pb/Pa)]
So if all points represent jurisdictions with the same population, then the region's Thiessen polygons would serve as its Reilly polygons. If not, the points representing jurisdictions with larger population would be surrounded by bigger polygons and so on...
[http://forums.esri.com/Thread.asp?c=3&f=38&t=121034#348553]
Thanks, Harsh
________________________________________________________________
Sent via the WebMail system at regiononepdc.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/
Get Access to the latest GIS & Geospatial Industry RFPs and bids
http://www.geobids.com
|
|
Sponsored by:
For information
regarding
advertising rates
Click Here!
|
