$[2]$ From the figure below, the correction distance equal $(1500$m$)$ in the field, find $L_f$ and elevation with check, if the details of field measurement as the table below?

$\backslash$table$[[L_s,50$ m$,L_{ft},50\mathrm{.}008$ m$],[$E$,{10}^{6}K\frac{g}{c}{m}^2,$A$,4m{m}^2$