SERVICES > Horizontal Control
Horizontal Control
Horizontal control is the geodetic network of precisely measured, coordinated reference points that ties every element of a survey, design, or construction project to a consistent, legally defensible coordinate system.
In land surveying, horizontal control anchors boundary and topographic work to state plane or project coordinates; in commercial construction, it serves as the field reference from which every structure, utility, and infrastructure element is located.
- Control Points: Establishes known points used to locate project features accurately
- Coordinates: Provides northing/easting or latitude/longitude values for mapped locations
- Project Baseline: Creates a reference line for layout, measurement, and construction staking
- Property Position: Helps tie the project to property boundaries and surrounding land features
- Building Layout Points: Supports accurate placement of buildings, corners, columns, and foundations
- Roadway Alignment: Guides the location of roads, curbs, sidewalks, and transportation features
- Utility Alignment: Helps position water, sewer, storm, electric, and communication lines
- Site Feature Locations: Identifies the horizontal position of structures, pavement, fences, walls, and other improvements
- Survey Grid or Datum: Connects the project to a consistent mapping reference system
- Construction Verification: Confirms that built improvements are placed in the correct horizontal location
Establishing reliable horizontal control at the outset eliminates compounding errors and ensures that deliverables from multiple phases and disciplines align seamlessly. Allen & Company’s licensed PSMs utilize high-accuracy GPS receivers and total stations to establish and densify control networks across projects of any scale.

