[Proj] NAD 27 v 83 Distances

[Norman Vine]

use the proj geod utility

http://trac.osgeo.org/proj/wiki/man_geod


or NGS has an online calculator that you can test some points with

http://www.ngs.noaa.gov/cgi-bin/Inv_Fwd/inverse2.prl

 Norman

On Oct 1, 2010, at 12:14 PM, Robert McFaul wrote:

> Hi,
> 
> I'm concerned about whether ground surface distances are different between
> NAD27 and NAD83. I'm in California (southern) and thinking about a 
> conversion
> of a project to NAD83. I have some cross section distances measured (1000 to
> 3000 feet in length) and suddenly am wondering what sort of differences 
> might
> be involved by this change in systems.
> 
> What can I expect here?
> 
> Thanks.
> 
> robert mcfaul
> robert at dgi.com
> 
> 
> 
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