On Tue, 10 Apr 2007, Roger Bivand wrote:
> On Mon, 9 Apr 2007 [EMAIL PROTECTED] wrote:
>
> > Roger Bivand <[EMAIL PROTECTED]> wrote on 2007-04-09 13:52:45:
> >
> > > On Mon, 9 Apr 2007 [EMAIL PROTECTED] wrote:
> > >
> > > > Roger's solution makes sense to me.
> > > >
> > > > The sinusoidal does
On Mon, 9 Apr 2007 [EMAIL PROTECTED] wrote:
> Roger Bivand <[EMAIL PROTECTED]> wrote on 2007-04-09 13:52:45:
>
> > On Mon, 9 Apr 2007 [EMAIL PROTECTED] wrote:
> >
> > > Roger's solution makes sense to me.
> > >
> > > The sinusoidal does have the appearance of pinching poleward, a
> > > consequenc
Roger Bivand <[EMAIL PROTECTED]> wrote on 2007-04-09 13:52:45:
> On Mon, 9 Apr 2007 [EMAIL PROTECTED] wrote:
>
> > Roger's solution makes sense to me.
> >
> > The sinusoidal does have the appearance of pinching poleward, a
> > consequence of allocating equal area by spacing equally in both x
and y
On Mon, 9 Apr 2007 [EMAIL PROTECTED] wrote:
> Roger's solution makes sense to me.
>
> The sinusoidal does have the appearance of pinching poleward, a
> consequence of allocating equal area by spacing equally in both x and y.
Both Canada and Norway - especially including Spitzbergen - suffer from
Roger's solution makes sense to me.
The sinusoidal does have the appearance of pinching poleward, a
consequence of allocating equal area by spacing equally in both x and y.
Also the Lambert cylindrical sent in before should have had standard
parallels set to +/- 30, i.e.,
(See attached file: whem
Canada looks pinched in this projection. S. Am is perfect.
THK
On 4/9/07, Roger Bivand <[EMAIL PROTECTED]> wrote:
> On Mon, 9 Apr 2007 [EMAIL PROTECTED] wrote:
>
> > For preview graphics and for large areas such as continents, large
> > countries, hemispheres, or the whole earth, spherical projec
On 4/9/07, Roger Bivand <[EMAIL PROTECTED]> wrote:
> On Mon, 9 Apr 2007 [EMAIL PROTECTED] wrote:
>
> > For preview graphics and for large areas such as continents, large
> > countries, hemispheres, or the whole earth, spherical projections are
> > often adequate. I can provide some of the ones I h
On Mon, 9 Apr 2007 [EMAIL PROTECTED] wrote:
> For preview graphics and for large areas such as continents, large
> countries, hemispheres, or the whole earth, spherical projections are
> often adequate. I can provide some of the ones I have used. For
> detailed work at sites and small areas, ell
For preview graphics and for large areas such as continents, large
countries, hemispheres, or the whole earth, spherical projections are
often adequate. I can provide some of the ones I have used. For
detailed work at sites and small areas, ellipsoidal projections such as
UTM are usually used, an
Denis,
That's really useful. It occurs to me that we only really need a
half-dozen basic projections to cover 90% of user cases. Perhaps these
could be incorporated into the 'sp' group somewhere and relieve the
dependence on proj4. (It could be packaged separately for R for the
other 10% of cases
Since this topic is of general interest, I've made an exception and
allowed (this once!) a posting of more than 200K. In general, if graphics
are big, please consider either an alternative device (png is often OK),
or posting just a URL to the real file.
With apologies to list members on dial-u
Thanks. My application is not that demanding. Really, I just want it
to look reasonable. My plan is to lay out the postings in the
projected coordinates and then back transform into geographic
coordinates for analysis. I tried lots of projections and found
Lamberts Azimuthal Equal Area to be quite
Anyone know of a particularly good map projection for showing all of
North and South America without too much distortion?
THK
--
Timothy H. Keitt, University of Texas at Austin
Contact info and schedule at http://www.keittlab.org/tkeitt/
Reprints at http://www.keittlab.org/tkeitt/papers/
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