distance2=(lon_cur-lon_1)/(lon_2-lon_1)
tab_coeffs2(1,1)=(1-distance2)*(1-distance1)
tab_coeffs2(1,2)=distance2*(1-distance1)
tab_coeffs2(2,1)=(1-distance2)*distance1
tab_coeffs2(2,2)=distance2*distance1
_RL ponderations(2,2),pondsSUM,distance1,distance2