1. Signs Point – Point Field and usefulness.
On the job Measure Land, both distance measurement and angle measurement, the necessary equipment and tools. According to the nature and usefulness, dots Survey and Pemetaandapat divided into two (2) pieces, the point is fixed (Bench Mark) and the point is temporary.
2. Fixed Point (Bench Mark)
Fixed point consists of a triangulation point and polygon points. Triangulation point of the monument is made of concrete and installed in large areas / mountains or on any island. Point polygon monument made of concrete and installed in small areas, such as in cities or industrial areas and housing. From a fixed point, besides known the coordinates (X, Y), and note also taken its height from sea level – average. Coordinates of the fixed point is measured and calculated Thorough because this point will be the basis of subsequent measurement.
Figure 4. Various – wide fixed peg
While 3.Titik
While the point is a mark / dot temporary, both the manufacture and use in measurement. Signs point while comprising:
3.1 Benchmarking
It is made of wood or bamboo, which is used to signal a temporary limit on the time of measurement. This point is planted into the soil to a depth of 0.25 up to 0.50 meters. Peg inserted into the ground by being hit and the rest protruding from the ground 5 to 10 cm. This tool should be marked with red paint to be easily visible. The size of 5 x 5 cm or 10 x 10 cm.
Figure 5. While stilt
3.2 Yalon
Yalon made of metal pipe with a diameter of ¾ inch is used to mark a point / boundary and transient measurements. To be easily visible, these tools every 20cm distance is colored red and white criss-cross. To prevent rapid deterioration, due to plugged into the ground, then the bottom is equipped with iron sapatu.
Figure 6. Yalon iron
3.3 Signs Measure (Measure Bak)
It is made of wood or aluminum, the front side there is a scale readings, used to mark the point while the field at the time of measurement. Rectangular signs berpenampang measuring size of ± 2 cm x ± 4 cm and a length of 3 to 5 meters. The front is equipped with a centimeter scale size. At each 1 meter given paint a different and striking. Signs penjangnya measuring 5 meters can be adjusted in use in the field (Figure 7).
The position of the tool – should be upright / vertical. Principal usefulness of this tool is for reading data on a carpenter’s level or plumb measurement space (to help measure the optical distance, angle of tilt and height difference).
Figure 7. Signs Measure