Office Track: Computations, Records, and Data Management
What the office track tests
The Office Track covers what happens after field data returns: coordinate geometry, record keeping, map and plat reading, unit conversions, and quality control of computations. Expect questions on coordinate systems, bearings and azimuths, area and distance computations, and the documentation that makes a survey defensible.
Core concepts to master
- Coordinates and bearings: northing/easting conventions, converting between bearings and azimuths, and the quadrant rules. A bearing is a quadrant angle (N/S then E/W); an azimuth is measured clockwise from north, 0°–360°.
- Traverse computations: latitudes and departures, closure, and linear misclosure. Latitude = distance × cos(azimuth); departure = distance × sin(azimuth).
- Area and distance: coordinate (shoelace) method for area, and distance/direction between two coordinate pairs.
- Records and units: field notes, metadata, unit conversions (feet/meters, acres/square feet), and the importance of a clear audit trail. Know that 1 acre = 43,560 sq ft and 1 meter ≈ 3.28084 ft.
Traps that appear in questions
- Reversing latitude and departure formulas.
- Forgetting that azimuths run clockwise from north while bearings are quadrant-based.
- Mixing up the direction of a bearing (e.g., N45°E vs. S45°W) when converting.
- Using the wrong conversion factor or dropping units in area computations.
Worked example / rule of thumb
A line of 100.00 ft at azimuth 30°: latitude = 100 × cos30° = 86.60 ft N; departure = 100 × sin30° = 50.00 ft E. Rule of thumb: cosine goes with latitude (north-south), sine with departure (east-west). Check a traverse by summing latitudes and departures; they should close to zero (or to the known endpoint). Record every step so the computation can be audited.