What is the base map used for geodetic network design when NAMRIA topographic data is available?

• A. Base Map
• B. Contour Map
• C. Road Map
• D. Satellite Images

Answer: (A)

A base map is the reference layer used for laying out a geodetic network. When NAMRIA topographic data is available, that data is used to create the base map because it provides the official, accurately georeferenced framework—include the coordinate grid, control points, and planimetric features—consistent with the national geodetic system. This base map serves as the stable foundation onto which the network’s stations and measurements are placed and adjusted, ensuring everything aligns with established coordinates. Other map types don’t provide that complete, standardized reference framework: contour maps emphasize elevation, road maps focus on transportation features, and satellite images offer imagery without the precise survey framework needed for network design.