[CF-metadata] proposed UTM projection

From: John Caron <caron>
Date: Wed, 02 Feb 2005 17:25:23 -0800

Rich Signell wrote:

>
> John Caron wrote:
>
>> Theres 2 parts:
>>
>> 1) Transverse Mercator doesnt specify the ellipsoidal parameters,
>> presuming i suppose a spherical earth. Im working with a dataset
>> where im told the ellipsoidal form is needed for accuracy..
>
>
> There are projections, and there are spheroids. You can use any
> projection with any spheroid. UTM is now most commonly used with the
> WGS84 spheroid, but has and can be used with any of them! Look at
> any (decent) map and it will tell you both the projection and the
> datum (which implies a spheroid).

Yep. But CF has no conventions for specifying the spheroid :^(

>
>>
>> 2) The UTM zone specification is in wide use, and is a shorthand for
>> all the other TM parameters.
>>
>
> Ok. So how about we add an attribute that specifies the UTM zone
> instead of a whole new projection.

possible; but then you should specify TM params OR zone, so that has to
be made clear.

either way is fine, what do the PTB (powers that be) think?
Received on Wed Feb 02 2005 - 18:25:23 GMT