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| GeoCommunity Mailing List |
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| Subject: | Re: GISList: Contour Interval Question |
| Date: |
07/30/2001 09:13:10 PM |
| From: |
David.Irving .. santos.com.au |
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Chris -
If your accuracy is +/- 5ft, you can't justify a finer interval than 10ft.
Regards,
David
"Weaver,
Christopher" To: gislist@geocomm.com
<CWeaver@icfconsu cc:
lting.com> bcc:
Subject: GISList: Contour Interval Question
30/07/2001 21:21
To all who are better at math (geodetics to i suppose) than I -
If I have a series of points, covering many miles, showing elevation spread
out at a distance of 25 feet from each other on the horizontal -- and
they have +/- 5 foot vertical accuracy
what is the recommended contour interval to use? .... and if I choose to
use a "finer" contour interval what is the interpolated accuracy curve
involved? ( i.e. how fine can i get away with and not have it be total BS
:-) )
... or is it possible that because a contour is generally interpreted by
the
algorithm, that there is only a small amount of difference in accuracy that
a 2 foot contour is only slightly worse than say a 10ft ... because error
is
inherent regardless.
By the way I plan to make it a raster and use the "contour" command in Arc
8, unless someone knows a better method.
Chris
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