[Proj] Re: Extracting the to_meter parameter from a projection
Frank Warmerdam
warmerdam at pobox.com
Tue Nov 15 18:38:10 EST 2005
On 11/15/05, Hearne, Michael (US SSA) <michael.hearne at baesystems.com> wrote:
> Frank - Thanks for your quick response. I searched through my copy of
> the proj4 source and couldn't find a function called pj_get_units_ref().
> Is this defined in a relatively recent version of proj4? My copy is
> perhaps a couple of years old. I do have the pj_units table defined in
> "pj_units.c".
Michael,
Yes, pj_get_units_ref() is relatively new. It, and some similar functions,
were added to give access to internal tables needed for "smart" applications
that need to know more about coordinate system options.
> Also, we tested pj_get_def() for a fairly exhaustive list of
> projections, and none of them returned a "+unit=" string token (list at
> bottom of email.) Does this mean that all of these projections are in
> units of meters?
All projections methods have an implicit unit type of meters unless
otherwise set. Try a definition like Arizona East NAD27 (+init=epsg:26748).
Best regards,
--
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I set the clouds in motion - turn up | Frank Warmerdam, warmerdam at pobox.com
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