[Proj] EPSG 7.9 Upgrade in Trunk

support.mn at elisanet.fi support.mn at elisanet.fi
Mon Oct 3 16:21:32 EST 2011


I hate geotiff since it does not carry the full information inside the
tiff file but can make an outside reference which nobody knows
where it leads. One should not allow any external references
except those that were once available when the geotiff was
created since all current and old programs can not handle new
external references since they do not carry the fresh database
with them. New definitions should carry all the data inside the
geotiff file but does geotiff even allow you to have any free datum
or similar?

The whole geotiff should be rewritten so that it would be more
stable and able to handle all current and future references
without any updates to the standard or databases. Preferably
a standard that would not need any external databases (which
BTW: the proj.4 definition almost is [if you count out those few
ellipses and datum names]).

Regards: Janne.


Frank Warmerdam [warmerdam at pobox.com] kirjoitti: 
> Folks,
> I have upgraded libgeotiff, PROJ.4 and GDAL with EPSG definitions regenerated
> from the EPSG 7.9 database.  New "preferred datum shift selection" rules are
> also in place which will give preference to 7 parameter datum shifts over
> 3 parameter datum shifts are also in place causing a fair amount of churn
> in the definitions.
> The updates are in "trunk" for each of the projects.  I plan to produce
> libgeotiff and PROJ.4 release candidates soon with the new definitions
> so if you think you might have objections please investigate and speak
> up promptly.
> 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/warmerda
> and watch the world go round - Rush    | Geospatial Software Developer
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