PENGUKURAN POLIGON TERTUTUP DENGAN ALAT THEODOLITE - Teknik SIpil UNP

Summary

This video tutorial explains the process of performing a closed polygon measurement using a theodolite and other related tools, such as a GPS, tripod, and leveling staff. It covers step-by-step instructions on setting up the equipment, taking measurements, and recording data for various points (P1, P2, etc.), as well as adjusting for azimuths and angles. The importance of safety gear is also emphasized, including hard hats, safety vests, and protective footwear. Additionally, the tutorial includes details on how to import coordinate data into AutoCAD and process it in Microsoft Excel for further analysis.

Takeaways

• 😀 A closed polygon measurement is used to calculate the area based on coordinate points that form a shape where the lines reconnect to the starting point.
• 😀 Closed polygon surveys are common for measuring contour points in civil engineering, such as for dams, bridges, land ownership, and topographic surveys.
• 😀 The primary tools for conducting a closed polygon measurement include a theodolite, tripod, leveling staff, GPS, compass, and measuring tapes.
• 😀 Personal protective equipment (PPE) like helmets, safety vests, safety boots, goggles, and masks are essential for worker safety during the measurement process.
• 😀 Theodolites are used to measure both horizontal and vertical angles, while the leveling staff helps determine height differences between points.
• 😀 GPS devices are used to record the coordinates and elevation of the starting point for the survey, ensuring precise location data.
• 😀 The theodolite must be carefully set up on a stable tripod, ensuring it's level and aligned with the reference point to accurately measure angles.
• 😀 The measurement process involves recording horizontal and vertical angles as well as noting the instrument's height at each point for later calculation.
• 😀 After taking measurements at one point, theodolites are carefully moved to the next point, with recalibration required to ensure precision.
• 😀 At the end of the survey, the equipment is stored properly to prevent damage, ensuring that the readings remain accurate for future use.
• 😀 Future steps include processing the measurement data in Excel and importing coordinates into AutoCAD for further analysis and drawing creation.

Q & A

What is the purpose of a closed polygon in surveying?

A closed polygon is used to calculate the area of land based on coordinates of points that connect back to the starting point, forming a closed shape. It is commonly used in civil engineering applications like building measurements, dams, land ownership, and topographic mapping.

What tools are commonly used in closed polygon measurement?

The tools used include a theodolite (for measuring angles), a tripod (for holding the instrument), measuring tapes or rods, leveling staff, GPS or compass, and safety equipment like helmets, safety vests, and boots.

What is the function of a theodolite in closed polygon measurement?

A theodolite is used to measure both horizontal and vertical angles in the field during a closed polygon measurement. It helps determine precise angles for accurate calculations of coordinates and areas.

Why is it necessary to use safety equipment during polygon measurements?

Safety equipment such as helmets, safety vests, and protective footwear is essential to prevent accidents on the field, such as falling objects, exposure to extreme weather conditions, and injury from hazardous materials.

How is the setup of a theodolite carried out in the field?

To set up a theodolite, the tripod is placed on the measurement point, the legs are adjusted to ensure the instrument is level, and the theodolite is securely mounted. The instrument is then centered over the point and calibrated for accurate readings.

What role does GPS play in the closed polygon measurement process?

GPS is used to determine the exact coordinates and elevation of the starting point (Point P1) of the polygon. It helps establish precise reference points for further measurements and calculations.

How do you determine the azimuth angle during the measurement process?

The azimuth angle is determined by adjusting the theodolite to point towards the north using either a compass or GPS. Once the instrument is aligned, the azimuth angle can be read from the theodolite's LCD display.

Why is it important to check the centering of the theodolite over the measurement point?

Ensuring the theodolite is centered over the measurement point is crucial for accurate angle measurements. Misalignment can result in errors in calculating coordinates and areas.

How are data from closed polygon measurements processed after the fieldwork?

After collecting the data in the field, the measurements are imported into Microsoft Excel for processing. Coordinates and angles are then transferred to AutoCAD for precise mapping and analysis.

What should be done to ensure the theodolite is stored properly after use?

The theodolite should be powered off, its securing screws should be loosened to prevent damage, and it should be stored in a protective box. The tripod should also be secured and the instrument carefully packed to avoid damage.