Method for estimating land surface temperature lapse rate using infrared image

• US 10,337,925 B2
• Filed: 12/11/2015
• Issued: 07/02/2019
• Est. Priority Date: 06/11/2013
• Status: Active Grant

• Current Assignee: University of Seoul Industry Cooperation Foundation (The University of Seoul)
• Original Assignee: University of Seoul Industry Cooperation Foundation (The University of Seoul)
• Inventors: Jung, Hyung Sup, Park, Sung Hwan
• Primary Examiner(s): Islam, Mohammad K
• Application Number:
  US14/966,369
• Publication Number:
  US 20160097679A1
• Time in Patent Office: 1,299 Days
• Field of Search: None
• CPC Class Codes: G01J 2005/0077 Imaging
• CPC Class Codes: G01J 5/007 for earth observation
• CPC Class Codes: G01J 5/02 Constructional details
• CPC Class Codes: G01J 5/025 Interfacing a pyrometer to an external device or network; User interface
• CPC Class Codes: G01J 5/026 Control of working procedures of a pyrometer, other than calibration; Bandwidth calculation; Gain control
• CPC Class Codes: G01W 1/00 Meteorology

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.

Claims

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.