How do you find the area of a DMD?
DMD (1) = (DMD of the first course) + (departure of the preceding point) + (the departure of the current point) Note 1. Double Areas = (Latitude) * (DMD) – Multiply the latitude of the course line by the DMD of the course line. The results will be either positive or negative.
How do you solve a DMD method?
Rule 1: The DMD of the first course is equal to the departure of the course. Rule 2: The DMD of any other course is equal to the DMD of the preceding course, plus the departure of the course itself. Rule 3: The DMD of the last course is numerically equal to the departure of that course, but with the opposite sign.
What is the DMD method?
A traditional method of computing area of a closed polygonal traverse is by DMDs: Double Meridian Distances. Triangular and trapezoidal areas can be computed by multiplying a meridian distance by the latitude of the respective line. The base of each triangle or trapezoid coincides with the meridian.
What does DMD stand for in surveying?
In practice, assuming a closed traverse with the meridian of reference passing through the initial station, the double meridian distance (DMD) of the first course (line) is equal to the departure of that course; the double meridian distance of each succeeding course (line) is equal to the double meridian distance of …
How do you use the coordinate method to find area?
By finding the product of a point’s x coordinate times the next point’s y coordinate, then subtracting the y coordinate of the first point times the x coordinate of the second coordinate and dividing by two, you will find the area of the polygon.
What is Bowditch rule in surveying?
1)Bowditch’s Rule: The Bowditch’s rule, also termed as the compass rule, is mostly used to balance traverse when linear and angular measurements are equally precise. By this rule, the total error in latitude or departure is distributed in proportion to the lengths of the traverse legs.
How do you calculate area in surveying?
To the sum of the first and last ordinate, twice the sum of intermediate ordinates is added. This total sum is multiplied by the common distance. Half of this product is the required area.
What is the DPD method?
A method of measuring the chlorine residual in water. The residual may be determined by either titrating or comparing a developed color with color standards. DPD stands for N,N-diethyl-p-phenylenediamine.
What does TP mean in surveying?
TIE POINT – The point to which a survey connection is made.
What does Ch mean in surveying?
Chain or chains
Ch. Chain or chains abbreviation. Coincident with Contacting a line or point without interval.
How does the DMD method calculate the Traverse area?
The DMD method calculates the traverse area by mutliplying the latitude and meridian distance of each line in the traverse, summing those products, and taking the absolute value of the sum.
Is the DMD the same as the coordinate method?
One is the coordinate method and the other is the Double Meridian Method (DMD.) Any particular station can be chosen as the reference point to find out the double meridian distance (Mi) for a course line.
How to calculate the area of a double meridian?
It can be easily interpreted that, Area = 1/2*Σ (Mi*Li), where Mi is the double meridian distance of course i, and Li is its latitude. Note that it is important to include the signs of values of latitudes and departures.