How to check if your surveyors are holding the pole vertically with the Leica GS18 T

作为调查经理，您可能会意识到问题 - 您要求您的团队确保杆子在测量和静止下是垂直的。但是，当他们从场地返回时，无法知道杆是否真的垂直固定。到目前为止。使用时Leica Captivate与Leica GS18 T GNSS sensor, it is now possible to check if survey teams were holding the pole vertically.

新的“仅商店倾斜”功能

到目前为止，我们始终解释了GS18 T是最快的GNSS RTK漫游器，因为由于倾斜度补偿的测量值不再需要垂直固定杆。这仍然是正确的，并且可能是与GS18 T合作的主要方式。但是，在某些项目上，由于法律要求，不允许倾斜的测量值。即使在这些项目上，当必须垂直握住杆子时，GS18 T仍然是正确的工具 - 它可用于证明杆子垂直固定。

在Caintivate v3.50中，引入了一种新设置，称为“仅商店倾斜”。当激活此设置时，倾斜度补偿不会应用于测量 - 必须垂直持有杆。但是，当存储一个点时，倾斜值将与点坐标一起存储。

The video below shows how to activate the setting and by tilting the pole, the tilt values are still computed. We then measure some points with the pole held vertically. The measured points, including the tilt values are then imported intoLeica Infinity可以看到倾斜值的地方。可以分析测量值 - 包括通过其倾斜值对点进行排序。

通过不握住杆子垂直，可以引入多少错误？

When measuring points with a GNSS RTK sensor in a conventional manner, the sensor must be held vertically such that the tip of the pole is vertically under the centre of the antenna (the Antenna Reference Point - ARP) - see Figure 1. By not holding the pole vertically, an error will be introduced to the measured point coordinates. The bigger the tilt, the bigger the error.

When measuring points in a conventional manner, a surveyor always tries to hold the pole as vertically as possible by watching the bubble attached to the pole. Most level bubbles attached to poles have a 20’ bubble. This means that even when carefully watching the bubble, it is easy for the pole to be tilted by 20’. A 2-metre pole tilted by 20’ introduces a 1-centimetre error to the computed ground coordinates.

此外，由于将极垂直的垂直固定，同时且同时测量一个点并不容易，因此许多用户将测量超过1个时代（例如5个时代）。在这段时间里，杆上的任何运动都将得到平均。

该点存储了什么倾斜值？

If a point is measured with one epoch, then the tilt value that is stored with the point is the tilt value at that epoch. If a point is measured for more than one epoch, then the largest tilt value over the epochs when the point was measured is stored with the point.

Make sure to regularly calibrate the bubble on your pole

Of course, even if the surveyor watches the bubble and carefully holds the pole such that the bubble is centred, this is of no use if the bubble itself is not calibrated. It is a simple task, and we recommend pole bubbles are calibrated once a month, or sooner if the pole is dropped.

另外，当然可以使用GS18 T来检查气泡的校准。将杆放在双脚脚架中，通过观察气泡观察到当前GS位置面板中的倾斜值，垂直握住杆子。

要求进行演示，如果您想尝试新的“仅存储倾斜”功能

This blog should give you a rough overview of the “Store tilt only” functionality within Leica Captivate and the GS18 T. If you would like more information, please contact your local Leica Geosystems representative – they’ll be more than happy to help.