What is the application of handheld laser rangefinder in archaeology
Application of handheld laser rangefinder in archaeology: At present, in field archaeology, instruments such as tape measure, GPS, total station are widely used to measure length, area and volume. Total station and GPS-RTK are used for topographic mapping, exploration and stakeout and engineering stakeout. So, what can a handheld laser rangefinder do? A handheld laser rangefinder can also measure distance, area, and hand volume, and coordinate with theodolite for coordinate stakeout. Distance measurement, a function used in archaeology. The following two examples are given: 1. In the process of drawing the tomb plan and section, the length, width and height of the tomb should be measured and registered first, and then drawn in proportion. It is assumed that the tomb is a vertical pit tomb with the same bottom. If you want to measure the width of the tomb, set the hand-held laser range finder from the bottom of the instrument, then stick the bottom of the hand-held laser range finder on the tomb wall, hold the horizontal button, and the tomb width data will be displayed on the screen.
The length measurement is similar to the width, and the depth measurement can be measured directly from the tomb mouth. If the bottom of the tomb is different, in order to prevent the influence of the inclination of the tomb wall, a telescopic rod can be used for delayed measurement. 2. Measurement of sealed soil piles. Set the handheld laser rangefinder to triangulation mode, then take the handheld laser rangefinder as the vertex (horizontal at the bottom of the sealing pile), measure the distance to the bottom and top of the sealing pile, and the height of the sealing pile will be automatically calculated. and displayed in the instrument. This feature is especially useful in the wild. In the resource survey of the Great Wall, some beacon towers cannot be climbed or are difficult to approach, so we can use this function to measure the height of the beacon towers. In the third national cultural relic census, some ancient buildings, stone carvings, etc. Also difficult to access, the feature is also available for measurements. Area and volume measurements are also widely used in archaeology. Such as exploration area, tomb area, urban site area, exploration earthwork, tomb earthwork, etc. To achieve these functions, simply switch the function options of the handheld laser rangefinder to the corresponding options, and then measure two or three data of the entity to obtain area and volume data. As for the stakeout function of the handheld laser rangefinder, it will not be described in detail here, because the stakeout function of the total station and GPS-RTK is much more powerful than it. Summary and Suggestions The handheld laser rangefinder is fast, accurate, easy to operate, and easy to carry. These advantages are worth promoting in our archaeological work. But there are also shortcomings, such as: the measurement range is short, generally around 200 meters, which cannot meet large-scale measurement; the price is high, generally ranging from several hundred to several thousand yuan. Therefore, in archaeology, the hand-held laser rangefinder should be used in conjunction with other surveying and mapping instruments to give full play to the advantages of various instruments and improve the accuracy and efficiency of archaeological surveying and mapping.
