[Proj] Natural Earth projection

[Bernhard Jenny]

I would like to suggest the inclusion of the Natural Earth projection in PROJ.4. Natural Earth is a new projection for small-scale world maps. Here is more information on the projection:
http://www.shadedrelief.com/NE_proj/

This recent article in Cartography and Geographic Information Science describes the development of the projection and its equations:
http://cartography.oregonstate.edu/pdf/2011_Savric_etal_PolynomialNaturalEarth.pdf

Here is C code ready to be included in PROJ.4:
http://www.shadedrelief.com/NE_proj/natural_earth_proj.zip 

I suggest the following entry for pj_list.h:
PROJ_HEAD(natearth, "Natural Earth")

Best regards,
Bernie

Bernhard Jenny
Assistant Professor
Cartography and Geovisualization
Oregon State University
jennyb at geo.oregonstate.edu
http://cartography.oregonstate.edu/