Union City: SR 138 Project
SEI utilized survey grade GPS units to establish survey control throughout each route for Vertical (MSL) and horizontal control. These control points were confirmed for accuracy by running a level loop on each route. A robotic total station and total station were utilized to gather the data required for the Base Map. These include; topography, creeks, streams or ditches, storm water and sanitary sewer pipes and associated structures, curb, gutter, pavement, striping, traffic control devices, all above ground visible utilities, property corners, right of way markers and any unusual features...