[andy/viking.git] / NEWGOOGLE

Mercator Projection
zoom=17 -- 200x200
sides just reach each other (+-180 long)
middle is 0 degrees -- Greenwich Meridian
middle is equator
zooming in is 2x
The northwestern most tile is always 0,0 and x,y increase by one

* easy to convert x,y -> ttqs etc.

highest is 1 "mpp" MERCATOR.


therefore top must be 85.051128779806582259 = DEMARCLAT(180)
Commit	Line	Data
50a14534 EB	1	Mercator Projection
	2	zoom=17 -- 200x200
	3	sides just reach each other (+-180 long)
	4	middle is 0 degrees -- Greenwich Meridian
	5	middle is equator
	6	zooming in is 2x
	7	The northwestern most tile is always 0,0 and x,y increase by one
	8
	9	* easy to convert x,y -> ttqs etc.
	10
	11	highest is 1 "mpp" MERCATOR.
	12
	13
	14	therefore top must be 85.051128779806582259 = DEMARCLAT(180)