Handheld laser rangefinders Application

Currently, instruments such as tape measure, steel tape measure, GPS and total station instruments are widely used in archaeology to measure the length, area, volume, etc., and topographical surveying, probe deployment, and engineering stakeout are performed using total stations, GPS-RTK, and the like. So what can a handheld laser rangefinder do? The handheld laser distance meter can also achieve the functions of measuring distance, area, volume, and coordinating with a theodolite.

Distance measurement, the most used feature in archeology. Here are two examples to illustrate: 1. During the drawing of the tombs in the flat and section drawings, the length, width and height of the tombs must be measured and registered, and then drawn according to the scale. Assume that the tomb is a vertical cave pit tomb and the bottom of the mouth is the same. If you want to measure the width of the burial chamber, set the hand-held laser distance meter (Hillit PD42) to start from the bottom of the instrument. Then place the bottom of the hand-held laser range finder against the tomb wall, keep the horizontal keys, and then the tomb width data. Will be displayed on the screen. The length measurement is similar to the width measurement. The depth measurement can be directly measured from the grave mouth, and the target board is also placed at the grave mouth. After the measurement is made from the bottom of the grave, the effect is consistent. If the bottom of the mouth of the tomb is different, to prevent the effect of tilting the tomb wall, it is possible to use an extension pole to make a delay measurement. 2. Measurement of soil mounds. Set the hand-held laser rangefinder to the triangulation mode, and then use the hand-held laser distance meter as the vertex (preferably at the bottom of the sealing pile) to measure the distance between the bottom and the top of the sealing pile respectively. Then, the height of the sealing soil pile will be The instrument is automatically solved and displayed. This function is particularly useful in the wild. Some of the beacons in the Great Wall Resources Survey cannot be climbed up or are difficult to access. This function can be used to measure the height of the beacon tower. In the third national cultural relics survey, there are some ancient buildings and stone carvings. Others are also difficult to access and can also be measured using this function.

Area and volume measurements are also widely used in archeology. For example, the area of exploration, the opening area of the tombs, the area of the city, the exploration of the earth, the tombs of earth. To achieve these functions, you only need to switch the function options of the handheld laser rangefinder to the corresponding options, and then measure the two or three data of the entity to get the area and volume data. As for the setting up of the hand-held laser rangefinder, detailed descriptions will not be given here because the total station and GPS-RTK have more powerful stake-out functions.

Handheld laser rangefinders are quick, accurate, easy to use, and easy to carry. These advantages are well worth promoting in archaeological work. However, it also has shortcomings, such as: measuring range is near 200 meters, generally can not meet a wide range of measurements; high prices, generally ranging from a few hundred to several thousand dollars. Therefore, in archaeology, we should use hand-held laser rangefinders in conjunction with other surveying and mapping instruments to give full play to the advantages of various instruments and improve the precision and efficiency of archaeological surveying and mapping.