Difference between revisions of "File:Nippon02.jpg"

Contour Map of main part of Japan and vicinities. Such maps are expected to be used as bases for the graphical representation of the geophysical research in TORI.

The following relation between the geographic coordinates $\alpha,\delta$ and the cartesian coordinates $x,y$ at the screen is used:

$\rm Degree=\pi/180$

$\alpha_0=40~ \rm Degree$

$\delta_0=140~ \rm Degree$

$c=\cos(\alpha_0)$

$\rho=\cos(\alpha_0)/\sin(\alpha_0)$

$r=\rho-(\alpha\!-\!\alpha_0)$

$\varphi=(c/\rho) (\delta\!-\!\delta_0)$

$x=r \sin(\varphi)$

$y=\rho-r \cos(\varphi)$

The figure is generated with code nippon02.cc
Copyleft 2011 by Dmitrii Kouznetsov.