Soil sampling method based on near-earth sensor technology

A sensor technology, sensor technology, applied in the field of soil sampling, can solve the problems of large sample size, time-consuming and labor-intensive, and the sampling position cannot be accurately positioned, so as to achieve the effect of saving sampling cost and improving sampling efficiency

Active Publication Date: 2013-07-10
ZHEJIANG UNIV
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Problems solved by technology

[0004] However, there are still some problems in the spatial sampling method based on geostatistics: (1) The design of the sampling scheme depends on the variation function, and the variation function can only be known after sampling
(3) The establishment of the variation function needs to meet two assumptions: the second-order stationary assumption

Method used

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  • Soil sampling method based on near-earth sensor technology
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  • Soil sampling method based on near-earth sensor technology

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Embodiment Construction

[0035] Attached below Figure 1-2 And embodiment further illustrate the present invention.

[0036] The tidal flat experimental farm in the northwest area of ​​Shangyu City, Zhejiang Province and the south coast of Hangzhou Bay was selected as the research area, and the experiment was carried out on April 26, 2012.

[0037] (1) Data acquisition: use the approximate grid format of the near-earth sensor EM38 to acquire horizontal mode ECa data (the conductivity data of 0-0.75m soil can be quickly obtained in the EM38 horizontal mode), and 339 soil surface data were obtained by scanning Conductivity ECa data, EM38 is connected to GPS to determine the position of each sampling point while working;

[0038] (2) Data preprocessing: the ECa data obtained in step (1) and the GPS data are merged into matrix data X, and the matrix data X is stored in the computer in file format;

[0039] (3) Matrix transformation: convert the matrix data X obtained in step (2) into principal component...

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Abstract

The invention discloses a soil sampling method based on a near-earth sensor technology. Data quickly acquired by utilizing a near-earth sensor are transformed into a decorrelation matrix with one center by transforming a principal component and removing outliers, then the positions of initial candidate points of a curved surface response design are found by adopting a central composite response design, the position points only statistically satisfy the selection of coordinate position points of the central composite response design, afterwards the screening of the optimal position is determined by adopting iterative computation according to the standards of minimized distance and a maximized covariance structure among close positions, whether sampling positions are evenly distributed in a sample area is judged by adopting an optimized index, and finally sampling points with the coordinate positions are output in a form of graphics. Efficient sampling for soil fertility can be carried out by combining the data quickly acquired by utilizing the near-earth sensor with the curved surface sampling design, and an optimal soil sampling layout scheme can be obtained quickly and accurately, the cost is saved, and the efficiency and the representativeness of the distribution of the sampling points are improved.

Description

technical field [0001] The invention relates to a soil sampling method, in particular to a soil sampling method based on near-earth sensor technology. Background technique [0002] Accurate understanding of soil fertility and its spatial distribution is the basis for fully, rationally and sustainably utilizing soil resources. Since it is impossible to measure the soil fertility characteristics of all locations in the region, sampling survey has become the basic method to obtain soil fertility information and its spatial distribution. Sampling design directly affects the accuracy of soil mapping using sample points, so it has become a key link in soil sampling surveys, and it is also a research hotspot in related fields at home and abroad. At present, the sampling methods commonly used for inferring and mapping the spatial distribution of soil fertility include classical sampling methods and spatial sampling methods based on geostatistics. Classical sampling methods usually...

Claims

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Application Information

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IPC IPC(8): G01N1/04
Inventor 史舟郭燕李艳
Owner ZHEJIANG UNIV
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