Method for calculating BBR (bedrock bare rate)
A bare rate and rock technology, applied in the field of ecological remote sensing application research, can solve the problem of incomplete consideration of ground object types, and achieve the effect of reducing manpower, improving calculation accuracy and high precision
Inactive Publication Date: 2017-12-15
PEARL RIVER HYDRAULIC RES INST OF PEARL RIVER WATER RESOURCES COMMISSION
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[0006] In view of the problems existing in the existing BRR remote sensing estimation model, the present invention discloses a method for quantitatively measuring the exposed rate of rocks in karst areas combined with unmanned aerial vehicles. The method does not fully consider the types of ground objects in karst areas. At the same time, the invention also proposes a method for evaluating and correcting the BRR calculated by the third-point method based on UAV images, so as to solve the problem of "same object with different spectrum" and "same spectrum". "foreign matter" phenomenon and errors caused by atmospheric conditions
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[0036] The essence of the method of calculating rock exposure rate described in this embodiment is the method of mixed pixel decomposition, that is, extracting various feature components (end members) and various features from the actual spectral data (generally the data of multiple feature spectral mixing) The method of the proportion (abundance) of the ingredients. Combine below figure 1 , Taking Landsat8 imagery as the satellite remote sensing data source as an example, the whole method process is explained in detail.
[0037] The method in this embodiment includes the collection and analysis of nearly 20 UAV data in a certain area (landsat8, 128042 scene), the establishment of the calculation formula of the rock exposure rate, the construction of the correction model, and the verification of the model accuracy. The specific steps are as follows:
[0038] Step (1): Calculate the reflectivity of three types of typical features of rocks, vegetation and soil in the red and near-in...
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The invention discloses a method for calculating the BBR (bedrock bare rate). The method comprises the steps as follows: the reflectivity of typical sampling point pure bedrock, vegetation and soil pixels at infrared and near-infrared wavebands is counted; a mixed pixel ternary decomposition method (ternary linear equation set) is established according to the mixed pixel decomposition principle, and the BBR of a karst area is calculated; unsupervised classification is performed on images shot by an unmanned aerial vehicle, and the BBR is extracted through binaryzation and used as a ground truth; a regression model is established according to the ground truth and a typical sampling point mixed pixel decomposition result to be used for accurately evaluating and systematically correcting the mixed pixel decomposition result, the corrected model is applied to a panoramic satellite image, and a large-scale application-grade BBR result is acquired. With the adoption of the method, the BBR of the karst area can be extracted efficiently and accurately.
Description
Technical field [0001] The invention relates to the field of ecological remote sensing application research, in particular to a method for calculating the exposed rate of rocks. Background technique [0002] Rocky desertification is the third largest ecological problem facing my country after soil erosion and desertification. Rocky desertification areas have become the fourth most vulnerable ecological area after the loess plateau, desert areas, and cold desert areas in my country. They are now gradually becoming a national concern. Focus. Mastering the status quo of karst land, especially the current status data and dynamic information of rocky desertification land distribution, degree, area, etc., can provide basic information for national and local governments to formulate rocky desertification prevention and control policies, compile comprehensive management plans, and realize sustainable development strategies. The bare rock ratio (BRR) is the most intuitive characterization...
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IPC IPC(8): G01N21/55G06T7/62
CPCG01N21/55G06T7/62G06T2207/10036G06T2207/30181
Inventor 亢庆扶卿华顾祝军李栋梁
Owner PEARL RIVER HYDRAULIC RES INST OF PEARL RIVER WATER RESOURCES COMMISSION