Re: Coordinate Systems Proposals
Brian Eaton (
eaton@merlin.cgd.ucar.EDU)
Tue, 15 Jul 1997 09:32:48 -0600 (MDT)
Hi John,
> >
> > Your question is really about how to interpret the coordinates. The same
>
> Actually, my question was more fundamental than an interpretation of
> the coordinates. (I can wire in a projection module later if I want to
> display the data on a globe.) At first, I usually just render the data
> in a cartesian "box". That is, I'm willing to take the lat's and lon's
> and just treat them as "distances" along 2 axes, but I would like the
> visualization to reflect the fact that, eg, the lon and lat spacing
> differ, so that I can get something close to a "correct" aspect ratio.
> What's the rule that tell me that lat(2,3) is the y-axis coordinate for
> temp(2,3)?
When you refer to a "correct" aspect ratio aren't you talking about an
interpretation issue? You only know that a one degree lon spacing
corresponds to a smaller great circle distance the closer you get to the
pole because you are interpreting the coordinate as a longitude coordinate.
If you're not interested in that interpretation of the coordinate variable
then it seems to me that it doesn't matter which one you assign to the
y-axis.
Brian
eaton@ncar.ucar.edu
