Accession Number:

ADA503518

Title:

Comparison of NDTI Methodologies to Classify Infrastructure in an Urban Battlespace From Thermal IR Signatures

Descriptive Note:

Conference paper

Corporate Author:

ENGINEER RESEARCH AND DEVELOPMENT CENTER CHAMPAIGN IL CONSTRUCTION ENGINEERING RESEARCH LAB

Report Date:

2008-12-01

Pagination or Media Count:

9.0

Abstract:

A major challenge of remote infrastructure classification is to distinguish pavements from roofs. We proposed that, due to their differing thermal masses, these elements will heat and cool differently. Therefore, their thermal infrared IR signatures will differ throughout a 24-hour cycle. We propose a method to rapidly identify urban infrastructure that will assist the Future Force in dominating the urban battlespace to the same degree that the current force dominates open terrain. We developed a fundamental thermal heating model for these infrastructure elements, and tested the model on spectral data gathered by NASAs Advanced Thermal and Land Applications Sensor ATLAS instrument. ATLAS is a 15-channel multispectral scanner that includes both the standard visible and near-IR bands, and adds additional bands in the middle reflective infrared and thermal infrared range TIR. Image processing techniques were applied to the imagery, focusing on the thermal bands 1015. A new indicator was proposed and tested in this research, the Normalized Difference Thermal Index NDTI. Development and verification of the thermal model was described in a paper presented at the 25th Army Science Conference McInerney et. al., 2006. The NDTI is based on the premise that materials have different spectral responses, so that ratioing the significantly distinguishing bands will provide a sensitive and comparable test of thermal character. In analyzing the results, the desire was to have the roofs and pavements appear distinctly separate. Statistical analysis of the NDTI technique was conducted to find the range, mean, and standard deviation of cells that were of either the pavement or roof type. NDTIs from these bands produce well-defined images that accurately identify ground-truth points, as shown in the image of downtown Atlanta.

Subject Categories:

  • Military Operations, Strategy and Tactics
  • Miscellaneous Detection and Detectors
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE