Which map is used as the base for plotting the boundary sketch for Geodetic Network Design?

• A. NAMRIA Topographic Map
• B. Local Street Map
• C. World Map
• D. Aerial Photograph

Answer: (A)

Understanding the need for a standardized base map is key when plotting a boundary sketch in Geodetic Network Design. You rely on a map that provides accurate, nationally coordinated references—projections, scales, and grid systems that tie directly into the geodetic control network. The NAMRIA Topographic Map is produced by the national mapping authority and offers these precise, official geodetic references. It gives consistent coordinates and boundary lines that surveyors can align with, ensuring the boundary sketch fits correctly within the national reference frame.

Local Street Maps are designed for navigation and often lack uniform projection and precise control needed for legal or boundary work. A World Map is too generalized to support detailed or localized plotting. An Aerial Photograph, while useful for identifying features, does not by itself provide the stable, standardized coordinate framework required for accurate plotting unless properly rectified and tied to the control network, so it isn’t the primary base map for boundary plotting.