• Applying the latest techniques from GPS by using (EGM 2008-1 geoid) for obtaining the elevation to have converted ORTHOMETRIC heights for all the polygon points (PP) & natural ground level (NGL).
• Carry out topographic survey work (20m x 20m) in longitudinal and cross sections for natural ground with corridor wide to get every change in natural ground level.
• Measure all as built features locations and asphalt roads every 20 meters if available within the corridor width.
• Measure only the visible utilities such as Manholes, land mark….Etc.
• Final submission will be only CAD & GIS files for the NGL, Natural Ground level, contour maps showing the ground changing in elevations with acceptable interval Station. All submissions will be electronic only.