[OSRS-PROJ] NTv1 (Canadian) Grid Shifts, and proj_def.dat

[Brent Fraser]

Frank,

  I've purchased the NTv2 data.  Can I use it with this new version of
PROJ.4 without any code modifications or extensive data re-formatting?

Brent Fraser
bfraser at geoanalytic.com
GeoAnalytic Inc.
#300 , 700 - 4th Avenue SW Calgary, AB
Canada T2P 3J4
Tel:  (403)213-2700 Fax:  (403)213-2707
www.geoanalytic.com


----- Original Message -----
From: "Frank Warmerdam" <warmerdam at pobox.com>
To: "PROJ.4 Discussion" <osrs-proj at remotesensing.org>
Sent: Thursday, April 05, 2001 1:11 PM
Subject: [OSRS-PROJ] NTv1 (Canadian) Grid Shifts, and proj_def.dat


>
> Folks,
>
> Two items.
>
> First, I have modified nad_init() to support loading of Canadian NTv1
> grid shift files which are free to use, though lower precision than the
> expensive NTv2 grid shift files.  Anyone interested in testing this is
> encouraged to contact me.
>
> Second, I would like to change proj_def.dat to provide a default ellipsoid
> of WGS84 (really would make it +datum=WGS84).  The assumption is that in
> this day and age WGS84 is a better default than clrk66 (normally NAD27).
> What are peoples opinions on making this change?  Obviously it could
> cause some problems, but I have been bitten a number of times by the
> implicit appending of clrk66.
>
> Best regards,
>
> ---------------------------------------+----------------------------------
----
> I set the clouds in motion - turn up   | Frank Warmerdam,
warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | Geospatial Programmer for Rent
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