Control Surveys

OrangeLineTBCMarshall Lancaster & Associates, Inc. develops and maintains control networks for variety of engineering, design, and construction projects. The firm maintains the latest laser, robotics, and global positioning systems (GPS). We have the equipment and expertise to layout, reference, and build reliable control networks.

Municipal Geographic Information System (GIS) Control Networks In a coordinated effort with municipal GIS departments, Marshall Lancaster & Associates, Inc. can design and build a durable horizontal and vertical ground control network. Initially, the ground control network can be utilized for aerial photography and topography. The network becomes a framework for all new engineering and surveying projects. Future land development design is then relative to a single horizontal and vertical datum. Many cities established physical GIS ground control networks in the last decade. Frequently, GIS ground control monuments are no longer inter-visible or have been destroyed by construction. The same is true for vertical control (benchmark) networks. We can density, map and provide data analysis of existing control networks. Once a physical GIS ground control network is established, city staff or our field crews can collect.

Construction Site and Phased Development Control NetworksMarshall Lancaster & Associates, Inc. also provides control networks for phased, large scale engineering, design and construction projects. Control networks can be developed to satisfy the needs of a construction company’s internal engineering department. We have extensive experience calculating and setting structural building control for unusually large or complex building designs. Construction companies also utilize our field control, data analysis, and mapped reports to satisfy project specifications or as verification of control set by other firms.

Aerial Photogrammetry Ground Control NetworksMarshall Lancaster & Associates, Inc. utilizes a combination of Global Positioning Systems and Robotic Total Stations to construct horizontal and vertical control networks for aerial photography. Aerial target specifications and location is coordinated with the photogrammetrist. Horizontal and vertical values of aerial targets are provided to photogrammetric companies in a variety of digital formats. Random cross section check shots taken on the ground at the time of control are then used to evaluate contour mapping developed by the photogrammetrist.

Monitoring Control NetworksMarshall Lancaster & Associates, Inc. can implement strategies to monitor critical structures. We provide mapping and reports depicting quantities for excavation projects or movement of dams, levees, retaining walls, foundations, and other man made or natural features.