warpedgeoid

/* 

 An Albers Equal Area Conic projection in javascript, for protovis.

 For centering the contiguous states of the USA in a 800x400 div, I used:

 var scale = pv.Geo.scale(albers(23, -96, 29.5, 45.5))
                .range({ x: -365, y: -375 }, { x: 1200, y: 1200 });

 http://mathworld.wolfram.com/AlbersEqual-AreaConicProjection.html