Height interpolation means the calculation of the height Z of a point known it s plane coordinates (X,Y) , without going to the field and using surveying instruments which costs a higher . The work can be done accurately in two steps . First "Height interpolation" using the Side interpolation method (developed by the author) which gives the "Interpolated height" through the plane surface of a triangle using few linear calculation , Second "filtering the interpolated height" using the "Effect of the adjacent triangles" (developed by the author) . The height will be interpolated three times one...