Measuring calibration method for monitoring sample plots of Karst forest communities
A technology of forest community and calibration method, which is applied in the directions of measuring point marking, measuring device, line-of-sight measurement, etc., can solve the problems that steel nails or wood are easy to move, the soil layer is shallow and loose, and it is difficult to find soil, so as to save calculation time, reduce the chance of error, and improve work efficiency
Active Publication Date: 2014-07-23
GUANGXI INST OF BOTANY THE CHINESE ACAD OF SCI
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Problems solved by technology
The traditional method of embedding piles at control points is usually to insert a steel nail or a small piece of wood with a diameter of about 1cm into the soil for marking. However, this method of embedding piles has two problems in the measurement of karst forests. In the forest, it is difficult to find a place with soil and no large trees nearby; secondly, because the soil layer is shallow and loose, the steel nails or wood inserted are easy to move, which will bring great errors to the measurement
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Embodiment 1
[0020] Example 1: A 15-hectare forest plot was measured and calibrated in Nonggang National Nature Reserve, Guangxi, and the grid node positions of each quadrat (20m×20m) were calibrated.
[0021] 1) Determine the direction of the four sidelines of the sample plot and the approximate positions of the four corners by checking and consulting the topographic map, and preliminarily determine the coordinate system of the sample plot with the corner point in the southwest direction as the origin;
[0022] 2) Use the coordinate measurement function of the total station to lay a first-level closed conductor along the four sidelines of the plot, including:
[0023] ① Select the initial control point (the initial control point is selected near the midpoint of a sideline of the sample plot), and the coordinates of the initial control point are given by the assumed coordinate method, that is, the (X1, Y1) coordinate value of the assumed initial control point It is (1000, 1000), which can ...
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The invention discloses a measuring calibration method for monitoring sample plots of Karst forest communities. The measuring calibration method comprises the following steps of: 1) preliminarily determining a coordinate system of a sample plot; 2) arranging a one-rank closed traverse along four side boundaries of the sample plot, wherein pile buried positions of control points constituting the closed traverse are selected on stable rocks, and a marking mode of the pile buried point is implemented through chiseling a shallow pit at a pile buried position and then drawing a circle by taking the shallow pit as an origin; 3) calculating the error of the one-rank closed traverse, and then carrying out balancing on the coordinates of the control points of the closed traverse; 4) according to the control points (subjected to balancing) of the closed traverse, introducing a branch traverse to the center of the sample plot; and 5) erecting a measuring station on the control points of the closed traverse and the branch traverse, calculating the horizontal distance and angle between a to-be-calibrated grid node and a point of the measuring station, and calibrating the position of the grid node of each quadrat by using a coordinate stake-out measuring function of a total station. By using the method disclosed by the invention, the accuracy of measuring calibration of monitoring sample plots of the Karst forest communities can be effectively improved.
Description
technical field [0001] The invention relates to a measurement and calibration method for sample plots in forest community monitoring, in particular to a measurement and calibration method for karst forest community monitoring sample plots. Background technique [0002] In forest community monitoring, it is usually necessary to accurately measure a rectangular or square sample plot with an area of several hectares or even tens of hectares from a continuously distributed forest, and divide the measured sample plot into a large number of 10m ×10m or 20m×20m grid quadrats, and the grid nodes of each quadrat can be demarcated before subsequent investigation and monitoring work can be carried out. The traditional forest compass measurement method is difficult to meet the accuracy requirements when measuring such a large sample plot. At present, a total station is generally used for stakeout measurement and calibration. [0003] Karst landform refers to various landforms formed ...
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IPC IPC(8): G01C15/02G01C1/00G01C3/00
Inventor 向悟生王新桂王斌李先琨
Owner GUANGXI INST OF BOTANY THE CHINESE ACAD OF SCI