Old columns of mine (including Uzbekistan) can be
downloaded (for free) from the "Grids and Datums" section
at:
http://www.asprs.org.resources.html
Be careful what you say in public (over the internet) about
System 42. It is still a State Secret in your country, and
the authorities are strict about that topic.
Another site that could help you is the U.S. military
mapping organization (it is unclassified, and available to
anyone over the internet).
http://www.NIMA.mil
Lots of stuff can be downloaded for free (from that site)
in regard to WGS84 Datum relations with other "Local"
Datums like System 42.
Clifford J. Mugnier ([EMAIL PROTECTED])
The Topographic Engineering Laboratory
Department of Civil and Environmental Engineering
UNIVERSITY OF NEW ORLEANS
New Orleans, Louisiana 70148
Voice and Facsimilie: (504) 280-7095
--------------------------------------------------------
-----------------
On Thursday, 17 February, 2000 3:52 AM, 52 [SMTP:52@mail
.ru] wrote:
> Hello List,
>
> Can any body explain to me what is datum, and where can i
> change it in
> MapInfo. As i undestand datum transformatin needed only
> when i want to
> jump from one ellipsoid to another. Is it right?
>
> I've found some information about datum i need (Pulkovo
> 1942) in
> LocalCoordSysDefs.fme file (Bursa transformation as i
> understood), but shifts there are slightly different
> from these that i got from another source, i know that
> datums are
> being changing with time, but where can i get recent
> information.
>
> I have following problem. I get some data that was made
> with some
> datum (is there any need to include one when creating a
> layer), so
> after importing it into Mapinfo i have certain coords
> shift. What can i do?
> Is there any understandable source of imformation about
> datums?
>
> --
> Best regards,
> Sim D.
> Biodiversity Conservation Center, Moscow
> GIS Dept. ++7(095)-124-7934
> mailto:[EMAIL PROTECTED]
>
>
>
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