function [fLongtitude,fLatitude]=proj_invsin_tile(iH,iV,fLin,fCol,iSize)

% get longitude and latitude give image coordinate in modis sinusoidal tile
% upper left corner of the first pixel of a tile is (-0.5,-0.5)
% isize : dimension of one modis tile, e.g., 1200 for 1km, 2400 for 500m, 240 for 5km.

y=(9-iV-(fLin+0.5)./iSize)/9.0;
fai=y.*pi/2.0;
fLatitude=y*90.0;
x=(iH+(fCol+0.5)./iSize-18.0)/18.0;
lambuda=x./cos(fai);
fLongtitude=lambuda.*180.0;	
