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Remote remote sensing estimation method and device for changes in surface temperature days

A surface temperature and remote sensing technology, which is applied in the field of remote sensing estimation of the intraday change process of the surface temperature, can solve the problems that the surface temperature is no longer satisfied, the cloudy conditions cannot be applied, and the effect of solving the estimation difficulty is achieved.

Active Publication Date: 2018-11-16
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the surface temperature is significantly affected by clouds during the course of a day, when clouds appear during the study time, the change of surface temperature with time no longer meets the curve in the DTC model
Therefore, the model can only be applied to perfectly sunny conditions and not to cloudy conditions
In actual research, the phenomenon of partly cloudy or full-time cloudy is common. However, no effective solution has been proposed for the technical problems of remote sensing estimation of the daily variation process of surface temperature in cloudy days.

Method used

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  • Remote remote sensing estimation method and device for changes in surface temperature days
  • Remote remote sensing estimation method and device for changes in surface temperature days
  • Remote remote sensing estimation method and device for changes in surface temperature days

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Embodiment 1

[0030] Such as figure 1 As shown, it is a flow chart of a remote sensing estimation method for the intraday variation process of the surface temperature provided by the embodiment of the present invention, consisting of figure 1 Visible, this method comprises the following steps:

[0031] Step S101: Obtain the meteorological data of the target area on the target date, as well as the surface net radiation data and soil heat flux data of the cloudy and cloudless time of the target date throughout the day, and the remote sensing retrieved surface temperature at the cloudless time Data and vegetation index data; the meteorological data include: air temperature data, atmospheric pressure data, relative humidity data and wind speed data; the above-mentioned surface net radiation data and soil heat flux data at cloudless time are obtained from remote sensing data.

[0032] For the estimation of the daily change process of the surface temperature in the target area under cloudy condi...

Embodiment approach

[0034] Here, when calculating the cloud-free time evapotranspiration of the target area based on the surface net radiation data and soil heat flux data, as figure 2 As shown, it is one of the feasible implementation modes, which includes:

[0035] S201: Using the surface temperature-vegetation index triangular space method to calculate the evaporation ratio at cloudless time;

[0036] S202: Calculate evapotranspiration at cloudless time according to the above-mentioned evaporation ratio at cloudless time, surface net radiation data and soil heat flux data.

[0037] Among them, the surface temperature-vegetation index triangular space method is to interpret the surface temperature-vegetation index scatter diagram constructed within the full range of changes in soil moisture and vegetation coverage, and use the simplified Priestley-Taylor equation to conduct regional evapotranspiration based on the full remote sensing data Estimation method of emission and evaporation ratio. ...

Embodiment 2

[0049] Embodiment 2 of the present invention further explains in detail the specific implementation of each step of the remote sensing estimation method for the intraday variation process of the surface temperature, so as to facilitate the understanding of the method. The specific implementation process is as follows.

[0050] Step 1: Preliminarily determine the input data set required for the daily variation process of surface temperature in cloudy days. For a specific date in the target area, it is necessary to collect remote sensing data when the satellite transits on that date without clouds, including: surface radiation product MOD02KM, surface temperature product MOD11_L2, surface albedo product MOD09A1, geometric correction product MOD03 and vegetation index product MOD15A2. In addition, it is also necessary to collect meteorological data for the whole day on this date, including air temperature data, atmospheric pressure data, relative humidity data and wind speed dat...

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Abstract

The invention provides a remote sensing estimation method and a device for changes in surface temperature days, which relates to the technical field of surface temperature remote sensing inversion. The method includes acquiring meteorological data of the target area all day on the target date, net surface radiation data and soil heat flux data with and without clouds, and remote sensing inversionof surface temperature data and vegetation index data at cloud-free time, according to the above data, the cloud-free time evapotranspiration and cloud-free time reference evapotranspiration and cloud-time reference evapotranspiration in the target area are calculated, according to the cloud-free time evapotranspiration and cloud-free time reference evapotranspiration and cloud-time reference evapotranspiration, the cloud-time evapotranspiration and the surface sensible heat flux are calculated, the surface temperature at cloud-time is calculated according to the sensible heat flux. The methodand device for remote sensing estimation method and a device for changes in surface temperature days can quickly capture the daily variation process of surface temperature under cloud conditions by remote sensing means.

Description

technical field [0001] The invention relates to the technical field of surface temperature remote sensing inversion, in particular to a remote sensing estimation method and device for the daily variation process of surface temperature. Background technique [0002] Surface temperature is a key parameter in surface energy balance and water cycle processes at regional and global scales. The diurnal change process of surface temperature can provide information on the temporal and spatial changes of surface energy balance, which can be used to evaluate surface energy and hydrological balance, surface thermal inertia and soil moisture, and help to obtain global surface temperature and long-term changes, which are important for climate, meteorology and hydrology. etc. research is of great significance. Due to the spatial heterogeneity of the surface temperature, it is difficult to obtain the intraday variation process of the surface temperature on the regional and global scales, ...

Claims

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Application Information

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IPC IPC(8): G06F17/50G01D21/02
CPCG01D21/02G06F30/20
Inventor 唐荣林姜亚珍李召良刘萌王桐邸苏闯
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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