Correlation length of natural terrain infrared images: Daily variation

N. Ben-Yosef, K. Wilner, S. Simhony

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The spatial structure of thermal images of natural terrain is analyzed. This structure is related through the heat balance equation to the thermal properties of the terrain and to the heat input from an external source. It is shown that the spatial autocorrelation of the terrain thermal image is a weighted superposition of the spatial autocorrelation functions of the thermal conductivity and absorbtivity. The relative weight of each changes as a function of the external heat source leading to a time-dependent autocorrelation function. Experimental results show an adequate agreement with the theoretical assumptions and prove that the correlation length of the thermal image decreases as the heat source strength increases.

Original languageEnglish
Pages (from-to)866-869
Number of pages4
JournalApplied Optics
Volume25
Issue number6
DOIs
StatePublished - 15 Mar 1986

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