[Proj] Mapping the rest of the world - Re: Mapping Africa in an equal area projection

Corrado Topi ct529 at york.ac.uk
Wed Dec 10 04:58:27 EST 2008

Dear Daan,

thanks a lot for point 1!

For point 2, unfortunately, we need to use the same projection for the whole
world, because some of the maps would be shown at world wide scale.

What do you think?

strebe wrote:

> Dear Corrado:
> At the scales you are working with, there is no point in worrying about
> ellipsoids. Spherical development is fine. You should use Albers equal
> area conic for North America and Eurasia, choosing standard parallels
> inset about 1/6th from the continental north/south extremes. Lambert
> azimuthal equal-area will work well with South America, Australia, and
> Antarctica each separately if you use the oblique case, centering it in
> the center of the continent.
> Regards,
> — daan Strebe
> On Dec 10, 2008, at 12:49:52 AM, Corrado <ct529 at york.ac.uk> wrote:
> Dear Daan,
> yes, 20 km x 20 km would be the higher resolution, but I do not think we
> have enough data to work at that resolution. Our data have all different
> resolutions, we will need to aggregate them ....
> Yes, the map is supposed to fit on the journal pages .... let's say
> maximum A4.
> PS: Is Lambert a good choice also for other continents? For another
> project I have to choose a projection / ellipsoid / datum , equal area,
> that is good for the whole world, with the smallest data cell at 10km x
> 10km. I would need to draw continental maps as well as some country maps.
> Do you think it is better to open a new thread altogether?
> Best,

Corrado Topi

Global Climate Change & Biodiversity Indicators
Department of Biology, University of York, UK

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