# FAQ | SingularXYZ TS1000 Total Station – Part 4 Station Occupation

In total station measurements, **station occupation** is crucial for establishing accurate reference points in surveying tasks. It involves setting up the total station at a specific location (the "occupy point") to measure and record data from various survey points. The accuracy of your measurements heavily relies on correctly setting and occupying these points. This blog will guide you through the importance of station occupation and introduce various methods used to ensure precise measurements in complex engineering projects.

**Coordinate System**

**Gauss Plane Rectangular Coordinate System**

The Gauss plane rectangular coordinate system is based on the intersection of the equator and the central meridian, which serves as the coordinate origin (O). The X-axis aligns with the central meridian in a north-positive direction, while the Y-axis runs along the equatorial projection line, with east as the positive direction. The quadrants are arranged in a clockwise order: I, II, III, and IV.

[Fig 1]

**Coordinate Calculations**

**Coordinate Forward Calculation**

When converting the plane position relationship between two points from polar coordinates to rectangular coordinates, it is referred to as coordinate forward calculation.

[Fig 2]

**Coordinate Inverse Calculation**

When converting the plane position relationship between two points from rectangular coordinates to polar coordinates, it is known as coordinate inverse calculation.

[Fig 3]

**Station Occupation Methods**

**1. Set Back-Sight by Coordinate**

Given the coordinates of points O and B, aim at point P to calculate angle α. Using the coordinate forward calculation (as shown in Fig 1), the coordinates of point P can be determined.

[Fig 4]

Input the coordinates of the occupation point and back-sight point.

[Fig 5]

**2. Set Back-Sight by Angle**

Given the coordinate of point O and the angle between OB and the Y-axis, aim at point P to calculate angle α. Using the coordinate inverse calculation (as shown in Fig 2), the coordinates of point P can be calculated.

[Fig 4]

Input the horizontal angle between O and the Y-axis as shown in Fig 4.

[Fig 6]

**3. Get Occupation Point by Resection**

Given the coordinates of points A and B in triangle ABP, where AP = L1 and BP = L2, calculate the coordinates of point P. Select point P as the occupation point, with A and B as back-sight points.

[Fig 7]

[Fig 8]

**4. Get Occupation Point by Side Shot**

When the stakeout point and the occupation point are not visible to each other, establish a transfer station as a new occupation point to measure the stakeout point. Given that O is the occupation point and B is the back-sight point, aim at P to calculate its coordinates, and then select P as the new occupation point.

[Fig 4]

Choose the side shot method for the new point.

[Fig 9]

Station occupation is a key process in ensuring accurate measurements with a total station. By properly setting and occupying specific points, you lay the groundwork for precise data collection and effective survey outcomes. Whether you're using coordinate calculations or advanced methods like resection and side shots, mastering these techniques will enhance your surveying accuracy and efficiency.

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