[gdal-dev] geographic vs projected coordinate system

[Martin Feuchtwanger]

Some of Phil's and Andre's words require correction:

Just because it is so simple mathematically, the Plate Carree (or 
equi-rectangular) projection is no less of a projection than others. 
Like /all /projections, it has its distortions and yet it preserves some 
geometrics. It is in the class known as "equidistant" projections. In 
this particular case, scale is preserved along the equator /and/ at all 
points on the map in a direction perpendicular to the equator. (Pretty 
impressive for something so simple, eh?)

Martin Feuchtwanger  feumar at shaw.ca  604-254-0361
http://members.shaw.ca/geomatics.developer

On 10/06/2013 2:22 PM, Phil Scadden wrote:
> There is nothing to stop you however from treating lat/long as 
> rectangular coordinates and using that as a "projection". The 
> projection figure is Plate Carree and /this has no redeeming 
> cartographic features as a projection/.
On 10/06/2013 8:44 AM, Andre Joost wrote:
> What you see on the screen, is in fact projected, but with a simple 
> one degree = one unit on the screen projection. The extent of that map 
> is still ± 180°/90°
>
> /This "projection" has none of the benefits usual projection have, 
> like true areas, true angles or true lenghts. /
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