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This URL certainly cuts out the need for an aero chart showing field elevation.
In fact, if you could see one or more of the monuments from your location,
a theodolite
would be enough, else an altimeter standardized at the monument's pressure
setting would provide the delta h.

Brian W

At 10:46 AM 3/1/02, you wrote:
>Thanks!  The URL is
>
>http://www.ngs.noaa.gov/cgi-bin/ds_radius.prl
>
>-----Original Message-----
>From: Navigation Mailing List
>[mailto:NAVIGATION-L@LISTSERV.WEBKAHUNA.COM]On Behalf Of Jared Sherman
>Sent: Thursday, February 28, 2002 9:31 PM
>To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM
>Subject: Re: Determining Elevation with an Altimeter
>
>
>Ummm...not to be a party pooper, but there is a web site (USGS?) that
>lists all USGS benchmark sites and their latest recorded
>positions along with any adjustments noted. You can interogate the site by
>giving it a lat/lon box and asking for a list of any
>benchmarks in it, so it may be possibly to simply locate a nearby
>benchmark and confirm the elevation and survey date. There will be
>notes about the map datum and vertical offset as well.
>
>I think someone from this list had originally given it to me, I can't seem
>to locate it right now.

Brian Whatcott
   Altus OK                      Eureka!

   

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