Base plan sheets are digital, graphic maps that portray the horizontal position of planimetric features using lines and symbols. A Digital Terrain Model (DTM) is collected to represent the surface of the earth. Ground control is set for this product. Aerotriangulation is performed to determine the position and orientation of the camera for each exposure so planimetric features are shown in their true relative coordinate position.

The typical base plan sheet scale is 1 inch = 50 feet.

Base plan sheets are used for final design of transportation projects.

Base plan sheets with associated X, Y coordinate system and the DTM are delivered to the customer.