Civillery : Polygon Measurement Practice with Theodolite

Civillery Zone, At work mapping the area needed a framework that is used as tie points and control points. The point of these points have height and coordinates posted on a certain density, using permanent structures, ang durable material, recorded and easily recognizable.
The function of the point as well as the basic framework of the control points are used as a check point on the calculation of the calculations performed earlier. Should these control points using other frameworks point (not from the point of tissue) so they can know the coordinates is true or not.
In a relatively small area (20km x 20km) typically use measurements by polygons. Here is a collection of polygons the points that are connected in an imaginary line. Work measurement include:

1. Coordinates of the starting point / end
2. Azimuth start / end
3. distance
4. angle in

The polygon shapes include:

1. polygon is open
2. polygon closed
3. polygon branched
4. polygon combination

Theodolite is a measure of the geometry of land can produce as well as distance and elevation angle optical (from reading the data processed yarn over, yarn and thread down the middle). Here is how the measurement of polygons using theodolite measuring instruments:

1. Do a peg at the point which allows for fine measurements. In searching for information on the location of the peg Benchmark (BM) around the site. After fixing, measuring the distance between the measuring tape markers on the polygon.
2. Start doing the shot, put a theodolite at BM point, setting it theodolite measuring instruments. If the topography is relatively flat try vertical angle is 90 degrees and lock it. The aim is to facilitate the measurement, recording and analysis of data.
3. Determine the azimuth direction, for example by the north compass, directions, and more. In setting azimuth angle horizontal position at 0 degrees 00 minutes 00 seconds.
4. After that, point the theodolite to the nearest polygon in stakes and easily target which, tubs measuring placed.
5. Furthermore, setting the horizontal angle, a key tool, and record.
6. At any point did recording measurements above thread, yarn and thread down the middle.
7. Perform benchmarking throughout the polygon.