xyscale_south

PURPOSE ^

XYSCALE_SOUTH - calculate scaling factor

SYNOPSIS ^

function res=xyscale_south(lat);

DESCRIPTION ^

XYSCALE_SOUTH - calculate scaling factor

   latitude is <0 in degrees.

   Usage:
      res=xyscale_south(latatitude)

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function res=xyscale_south(lat);
0002 %XYSCALE_SOUTH - calculate scaling factor
0003 %
0004 %   latitude is <0 in degrees.
0005 %
0006 %   Usage:
0007 %      res=xyscale_south(latatitude)
0008 lat=-lat/180*pi;
0009 
0010 m71_t71=1.9390295644;
0011 e2=.00669437999015;
0012 e=sqrt(e2);
0013 
0014 m=cos(lat)./sqrt(1-e2*sin(lat).^2);
0015 t=tan(pi/4-lat/2)./((1-e*sin(lat))./(1+e*sin(lat))).^(e/2);
0016 k=m71_t71*t./m;
0017 res=(1./k./k);

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