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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | RE: [gislist] GIS Puzzle |
| Date: |
02/02/2004 10:50:01 AM |
| From: |
True, Cynthia D. |
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We had a similar question here in the Midwestern US. What I did was
convert the roads to grids with different widths for different types of
roads. Limited access divided highways are wider than neighborhood
roads. Then I calculated the distance from road right-of-way. In our
case, we were looking for areas far from roads to evaluate conservation
opportunities since areas far from a road have a greater chance of
maintaining undisturbed native vegetation.
Good Luck,
dt
C. Diane True
Missouri Resource Assessment Partnership
http://www.cerc.usgs.gov/morap/=20
(USA voice) 573-441-2794
"For if one link in nature's chain might be lost, another might be
lost, until the whole of things vanishes by piecemeal."
- Thomas Jefferson
-----Original Message-----
From: gislist-bounces@lists.geocomm.com
[mailto:gislist-bounces@lists.geocomm.com] On Behalf Of epoulsen
Sent: Sunday, February 01, 2004 7:38 PM
To: gislist@lists.geocomm.com
Subject: [gislist] GIS Puzzle
Hello!
I have GIS puzzle. I am looking to create a road accessibility variable
for districts in Mozambique. I have 3 types of roads categories paved,
semi-paved and dirt. What I want to be able to do is come up with a
value for the accessibility to the roadway, weighted based on type. One
thing that I notice most studies seem to do is to calculate a road
density based on the length of road and the area of the polygon, however
I feel that this won't represent access for those polygons that have
roads nearby and/or surrounding them (as there is accessibility to
them), but would end up with a value of zero.
So is there anyone out there that can think of a good way to get a value
for accessibility with weighting the roads based on the category? Or
know of some study/genius that has?
Thank you so much!
Erika
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