Aerial Triangulation is the process of contiguous densifying and extending ground control through computational means. This operation includes establishing ground control points; performing interior orientation; measuring and transferring all tie, check, and control points appearing on all photographs manually; and performing a least squares block adjustment. This process ultimately provides exterior orientation parameters for photographs and three-dimensional co-ordinates for measured object points. The purpose of Aerial Triangulation is to refine the Exterior Orientation parameters (ΔX, ΔY, ΔZ, Ω, Φ, κ) computed through direct geo-referencing for each imagery, which will help to achieve the desired accuracy while generating DEM. In general the ground control points provided by the client will be used for Aerial Triangulation. We follow highly automated aero triangulation approach that minimizes the manual intervention and increases accuracy towards higher side. This is the combination of point selection, point measurement, point transfer and block adjustment in a single process.