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L-waveband forest transmittance measurement method

A measurement method and technology of transmittance, which is applied in the field of forest parameter measurement, can solve the problems of not measuring forest transmittance, etc., and achieve the effects of easy operation, accurate measurement results, and simple calculation process

Inactive Publication Date: 2016-10-26
NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the prior art, there is no method for measuring forest transmittance

Method used

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  • L-waveband forest transmittance measurement method
  • L-waveband forest transmittance measurement method
  • L-waveband forest transmittance measurement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] L-band birch forest (average DBH 5.1cm, average tree height 12m, tree density 0.29 / m 2 , the volume is 129m 3 / ha) transmittance measurement method, the steps are as follows:

[0061] Step 1. Fix the bottom surface of the microwave radiometer 2 on the top surface of the rotary platform 3. The antenna of the microwave radiometer 2 is parallel to the horizontal axis of the rotary platform 3. The model of the microwave radiometer 2 is JYR-L-01. A microwave radiometer with a frequency of 1.4GHz, a bandwidth of 40M, and a main beam width of 15°; the bottom surface of the rotating platform 3 is fixed on the top of the base 4, and the rotating platform 3 drives the microwave radiometer 2 to rotate to realize the microwave radiometer 2 For the adjustment of altitude and azimuth angle, the model of the rotary head 3 is JYT-01, the rotation azimuth angle is 0-360°, the resolution is 0.5°, the rotation altitude angle is 0-90°, the resolution is 0.5°, the load 40kg; the rotating ...

Embodiment 2

[0070] The method of measuring L-band larch transmittance, the steps are as follows:

[0071] Choose larch (average DBH 9.1cm, average tree height 13m, tree density 0.11 / m 2 , the volume is 174m 3 / ha) as measurement object, all the other steps are as embodiment 1.

[0072] The transmittance of embodiment 1 measured white birch forest and the forest transmittance of theoretical model simulation are as follows figure 2 Shown, the forest transmittance of the transmittance of embodiment 2 measured larch and theoretical model simulation is as follows image 3 shown. From figure 2 and image 3 It can be seen that the forest transmittance measured by the measurement method of the present invention is in good agreement with the theoretical (model) value. Among them, the theoretical model of forest transmittance adopts the TorVergata model based on the double matrix method (Rahmoune et al., 2013).

[0073] Table 1 shows the root mean square error (RMSE) and standard deviation...

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Abstract

The invention relates to an L-waveband forest transmittance measurement method, belonging to the technical field of forest parameter measurement. The measurement method comprises the following steps: firstly building a measurement device consisting of a base, a rotating holder, a microwave radiometer, a power supply and a data terminal, then controlling the rotating holder to rotate through the data terminal, so as to drive the microwave radiometer to measure the forest lower microwave radiation brightness temperature at different elevation angles and different orientation angles, and calculating the forest transmittance of L waveband according to the measured forest lower microwave radiation brightness temperature, forest temperature and assumed sky lower microwave radiation brightness temperature. According to the method, the measurement processes are easily operated, the calculation process is simple, the measurement results are accurate, and the method is an effective method for measuring the forest transmittance of the L waveband.

Description

technical field [0001] The invention relates to a method for measuring L-band forest transmittance, and belongs to the technical field of forest parameter measurement. Background technique [0002] With a total area of ​​4 billion hectares, accounting for 30% of the total land area, the forest is the largest terrestrial ecosystem with the most complete ecological functions on the earth. It plays an irreplaceable role in water cycle, carbon cycle, energy cycle and maintaining ecological balance. Therefore, the quantitative observation and remote sensing inversion of forest biophysical parameters and soil moisture, freeze-thaw state and snow cover parameters under forest cover are very important for the research of forest ecosystem function, global environmental change, carbon source and sink, etc. [0003] The L-band has strong penetrability, and can penetrate through the forest canopy to detect parameters such as soil moisture, permafrost depth, and freeze-thaw state under f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N22/00
CPCG01N22/00G01N2223/33
Inventor 姜涛赵凯郑兴明杨建卫
Owner NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S