1. Instructions
a. Note the location of the measurement, perhaps there are objects – objects or dangerous animals.
b. Heart – heart in reading oblique angle, so the results carefully
c. Careful careful in reading the oblique distance, usually the zero point is not started from the beginning of the measuring tape
2. Equipment and Supplies Used
a. Yalon (minimum 2 pieces)
b. Clinometer
c. Stakes bamboo / wood while (at least 2 pieces)
d. Measuring tape / meter (minimum 15 m)
e. 3m roller meter or 5 meter
f. Writing pad, writing tools, paper to sketch / note.
3. Safety
a. When carrying yalon, draped, front blunt, and should not be dragged yalon
b. Currently, the practice is prohibited kidding.
c. Be careful when plugging yalon to the ground.
d. After completion of the practice, the equipment must be cleaned again.
Clinometer is an instrument used to measure the angle of slope on sloping ground. Oblique angle obtained from this measurement, for the purpose of / get flat distance and height difference, but the results are less scrupulous. To get the flat distance can be calculated using the formula: Distance Flat = distance x cos oblique oblique angle. To calculate the height difference is: Different height = distance x sin oblique oblique angle. Note: height targeted at yalon should be at eye level viewfinder. Example: Suppose the measurement results oblique angle = 30 °, and the distance measurement results skewed = 20,00m, the flat distance Cos = 20.00 x 30o = 20.00 x 0.866025 = 17.321 m, while the height difference = 20.00 x Sin 30o = 20.00 x 10.00 m 0,0,500 =
Measuring angle Azimuth / Angle majors with Compass
Compass is a tool used to measure the angle of the department / azimuth angle. That then the data can be to calculate the coordinates of a point when the previous point coordinates are known, flat distance and angle is also known department. The juusan angle is the angle measured from the direction of true north (astronomical) in the direction clockwise, in the direction you intended. While the azimuth angle is the angle measured from the direction of magnetic north, in the direction of clockwise.
The difference between the astronomical north and magnetic north is called declination. Work steps :
a. Place the tripod (the stand) compass (no original) or create your own, at point A and set the compass on the stand.
b. Install yalon on tiitik B measured Azimuthnya
c. Set the compass and set visir aligned with the magnetic needle.
d. When the magnetic needle and visir already lie on a line, it means the compass has mengaah to the North, set scale readout angle of 0 ° 0 ‘North.
e. Point your compass to point B, Zero through visir toward yalon B, read the compass angle
f. A measure of distance -B, with a measuring tape (d1).
g. Example of calculating the coordinates of the point B when the coordinates of a known point: Suppose known Azimut measurement results between point A and point B (α AB = 60 °), the distance between points A and B (d AB = 20,000m), the coordinate point A (XA, YA ) = A (10m, 10m), calculate the coordinates of point B.
Completion:
ΔX flat AB = distance x Sin α AB = 20 x 0.86603 x 1m = 17.321 m
ΔY flat AB = distance x Cos α AB = 20 x 0.50000 x 1m = 10.000 m
Then XB = XA + ΔX AB = 10,000m + 17,320m = 27,321m
And YB = YES + ΔY AB = 10,000m + 10,000m = 20,000m