Accession Number:

ADA231167

Title:

Spectral Characteristics of some Saline Playa Surfaces and their Application to Multispectral Imagery Analysis

Descriptive Note:

Scientific paper 23-27 Jul 1990

Corporate Author:

ARMY ENGINEER TOPOGRAPHIC LABS FORT BELVOIR VA

Personal Author(s):

Report Date:

1990-07-27

Pagination or Media Count:

10.0

Abstract:

Playas, commonly formed in arid basins, can have surface conditions ranging from hard and dry to soft and moist. These surfaces result from the relation between the hydrologic environment and the mineralogy of the surrounding basin. Surfaces composed of soluble salts deposited by capillary action from saline ground water can be found on playas in structurally closed basins. To determine methods of discriminating different saline mineral deposits using multispectral imagery, spectral reflectance data 400 to 2500 nm range of selected saline playas in the Mojave Desert were collected using a portable spectroradiometer. Reflectance data included field spectra of salt crusts and laboratory spectra of pure compounds and salt mixtures. Results show that while certain common soluable materials such as potassium chloride and sodium chloride are spectrally featureless in the Landsat Thematic Mapper TM visible and near infrared bands, others such as calcium sulfate and calcium chloride have absorptions in TM bands 5 and 7 which allow their discrimination from other salts. Knowledge of the spectral characteristics of these materials allows selection of band combinations and ratios which maximize discrimination of different surfaces using TM multispectral imagery.

Subject Categories:

  • Cartography and Aerial Photography
  • Geology, Geochemistry and Mineralogy
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE