[GRASSLIST:1882] Re: Importing USGS SDTS DLG maps from differing
datums? I'm confused. [very long]
rshepard at appl-ecosys.com
Sun May 27 12:41:58 EDT 2001
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.
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.
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
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