Land Surveying by the Numbers: Angles & Bearings, Distance Reductions, Closed Traverses, Misclosure & the Bowditch Adjustment, Coordinates, Levelling Runs & Setting Out
Turn field-book readings into checked coordinates and heights. You will convert and balance angles, carry bearings around a traverse, reduce slope distances, compute latitudes and departures, judge the misclosure, adjust it with the Bowditch rule, reduce a levelling run two ways and prepare a setting-out table, with every cell checked as you go.
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About this course
This course turns a fictional field book into checked coordinates and heights. You convert DMS angles to decimal degrees, find the angular misclosure and balance the interior angles of a closed traverse. You carry azimuths round the loop with MOD, add back and quadrant bearings, reduce repeated slope readings to horizontal distances and apply a temperature correction in ppm and a scale factor. You compute latitudes and departures, the linear misclosure and the precision 1 : x, adjust the traverse with the Bowditch rule and build coordinates, joins and radiated detail points. A levelling run is reduced by rise and fall and by height of collimation, and the capstone delivers the parcel area, a setting-out table and an XY plot.
Lessons
- Angle Units & Angular Misclosure: DMS, Decimal Degrees and the (n − 2) × 180° Check Pro
- Bearings & Azimuths: Carrying Whole-Circle Bearings Round the Traverse, Back Bearings and Quadrant Bearings Pro
- Distance Reductions: Repeat Readings, Slope to Horizontal and Correction Factors Pro
- Latitudes & Departures: ΔN and ΔE, Linear Misclosure, Precision 1 : x and an Accuracy Class Pro
- The Bowditch (Compass) Adjustment: Corrections in Proportion to Leg Length Pro
- Coordinates & Joins: From a Start Point, Join Bearings with ATAN and a Quadrant Correction, and Radiation Pro
- Levelling: Rise-and-Fall and Height-of-Collimation Side by Side, Arithmetic Checks, Misclosure & Distribution Pro
- Capstone – Area & Setting Out: Parcel Area from Coordinates, a Setting-Out Table and the Traverse Plot Pro