NSPS CST Level III: Office Track

Office Track: office analysis and deliverables

The NSPS CST Level III Office Track tests advanced office production: reducing field data, adjusting control and traverses, resolving boundary evidence, working with PLSS and recorded documents, coordinate geometry, CAD/mapping, quantities, and QA/QC. Level III asks for defensible decisions, not just button sequences.

Core rules

• Keep datum, projection, units, and epoch explicit. Ground coordinates, grid coordinates, and state plane coordinates are not interchangeable.
• Check closures before adjustment. Use blunders-first logic: a large residual is usually an observation error, not random error.
• Boundary resolution follows evidence hierarchy: monuments and physical evidence generally outweigh deed distances and areas, subject to law and record research.
• CAD deliverables need layer standards, point blocks, linework, annotation, and metadata. A drawing with unchecked coordinates is a liability.
• Area and quantity computations must be reproducible: show coordinates, formula, units, and rounding.

Worked example

Find the area of a parcel with coordinates (0,0), (200,0), (200,150), and (0,100) ft using the coordinate/shoelace method. Sum x_i y_{i+1} − y_i x_{i+1}: 0 + 30,000 + 20,000 + 0 = 50,000. Area = 50,000 / 2 = 25,000 ft². In acres: 25,000 / 43,560 = 0.574 acre. If the deed says 0.60 acre, do not force the coordinates to match the deed area; investigate evidence and record calls.

Traps that cost marks

• Forcing a deed area to control over monuments.
• Mixing ground and grid distances.
• Adjusting before finding a blunder.
• Rounding intermediate coordinates.
• Delivering CAD without a coordinate-system check.