[Proj] Re: Mapping Africa in an equal area projection

[strebe]

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,

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/proj/attachments/20081210/37c2317e/attachment.html>