Method for estimating land surface temperature lapse rate using infrared image

Patent metadata

Field	Value
Publication number	US-10337925-B2
Application number	US-201514966369-A
Country	US
Kind code	B2
Filing date	Dec 11, 2015
Priority date	Jun 11, 2013
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A method of estimating land surface temperature lapse rate using an infrared image is disclosed. In the method of estimating land surface temperature lapse rate using an infrared image, a target area for the estimation of land surface temperature lapse rate is selected. The atmospheric transmittance of the target area is calculated. Reference temperature is estimated at a reference location set in the target area as desired. A temperature difference is calculated from the atmospheric transmittance and the estimated reference temperature, and then a temperature difference image is generated. Land surface temperature lapse rate is estimated from the temperature difference image and a Digital Elevation Map (DEM) in an identical area using an elevation-based temperature difference distribution.

First claim

What is claimed is:

1. A method of estimating land surface temperature lapse rate using an infrared image, comprising:
collecting radiant energy radiated from a land surface in the infrared image using an infrared sensor;
extracting a normalized difference vegetation index (NDVI) image from the infrared image;
generating an estimated radiant temperature based on at least one of the NDVI image and the radiant energy collected from the infrared sensor;
selecting a target area in the infrared image for estimation of the land surface temperature lapse rate according to the estimated radiant temperature;
calculating atmospheric transmittance of the target area;
estimating reference temperature at a reference location set in the target area;
calculating a temperature difference from the atmospheric transmittance and the estimated reference temperature, and generating a temperature difference image;
estimating the land surface temperature lapse rate from the temperature difference image and a Digital Elevation Map (DEM) in an identical area using an elevation-based temperature difference distribution; and
calculating an air temperature-based land surface temperature lapse rate using a linear regression curve according to an equation as follows:
r T =c·T air +d,

wherein r T is the estimated land surface temperature lapse rate, T air is the air temperature, and c and d are variables of the linear regression curve.

2. The method of claim 1 , wherein the estimating land surface temperature lapse rate comprises estimating the land surface temperature lapse rate via linear regression analysis.

3. The method of claim 2 , wherein the estimating land surface temperature lapse rate comprises:
re-sampling the DEM so that it has to have spatial resolution of the temperature difference image;
generating elevation-based temperature difference data from the DEM and the temperature difference; and
calculating the linear regression curve via the temperature difference data.

4. The method of claim 1 , wherein the calculating atmospheric transmittance is performed to minimize atmospheric effects of the infrared image.

5. The method of claim 1 , wherein the estimating reference temperature comprises approximately observing land surface temperature from the infrared image and then estimating the reference temperature, or observing the reference temperature via field observation.

Assignees

• Univ Seoul Ind Coop Found
• Univ Of Seoul Cooperation Foundation

Inventors

• Jung Hyung Sup
• Park Sung Hwan

Classifications

• G01J5/025

  Interfacing a pyrometer to an external device or network; User interface · CPC title

• G01J5/007 Primary

  for earth observation · CPC title

• G01J5/026

  Control of working procedures of a pyrometer, other than calibration; Bandwidth calculation; Gain control · CPC title

• G01J5/02

  Constructional details · CPC title

• G01J2005/0077

  Imaging · CPC title