[GRASSLIST:1882] Re: Importing USGS SDTS DLG maps from differing datums? I'm confused. [very long]

[Rich Shepard]

On Thu, 24 May 2001, Roger S. Miller wrote:

> I believe you were correct that the boundaries of the two maps should
> *not* have overlain after the conversion.  So I did a complete conversion
> manually to check GRASS' results.

Roger,

  You have what appears to be a complete description of the conversion
algorithm in your message. Would you be willing to make your untility
programs available to the rest of us who have to cope with mixed-data
(NAD27, NAD83), too?

  Many areas use both older and newer data. In my former life, working with
MapInfo, I converted everything to NAD83/feet (because that's what many
regulatory agencies want) and the applicable State Plane Coordinate zone.

Thanks,

Rich

Dr. Richard B. Shepard, President

                       Applied Ecosystem Services, Inc. (TM)
            2404 SW 22nd Street | Troutdale, OR 97060-1247 | U.S.A.
 + 1 503-667-4517 (voice) | + 1 503-667-8863 (fax) | rshepard at appl-ecosys.com