CE 134 Lecture Notes - Lecture 12: Hectare, Parallelogram
22 May 2016
School
Department
Course
Professor
Document Summary
*area calculations are important in order to make contours (lines of equal elevation) and to generate digital elevation models. Coordinates (many more methods are available with automation. ) When a stream or river forms a property boundary, that side of the property will have an irregular edge. Offsets from a line are used to form a series of trapezoids. In this situation 90o lines are established from the base line to a point on the irregular boundary. The number of offsets and the offset interval is determined by the variability of the irregular boundary. The area of each trapezoid is determined and summed to find the total area. Formulas are available in the course reader for regular and irregular offset interval. The area is computed by cross multiplying the x and y coordinates. Important: coordinates of the starting point must be repeated at the end.
