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Comparison of Multispectral Measurements from Some Nonvegetated Soils Using Landsat Digital Data and a Spectroradiometer¹

ABSTRACT

A known method of accurately measuring the spectral properties of soil is with a laboratory spectroradiometer. The Landsat satellites can also measure spectral properties of nonvegetated soils. In this study, Landsat-l spectral measurements of 16 selected soil sites were adjusted for atmospheric effects and compared to spectroradiometer measurements, considering the spectroradiometer to be a reliable reference.

Landsat radiance and spectroradiometer reflectance values were highly correlated for all Landsat wavelength bands. Analysis of variance showed that these 16 soils, consisting of 11 soil series, could be separated into five spectrally distinct groups on the basis of surface color and into four groups on the basis of series characteristics.

¹ Journal paper no. 7551. Purdue Univ. Exp. Stn., West Lafayette, Ind. Contribution from the Dep. of Agronomy. Supported in part by NASA Grant NGL 15-005-112.

² Assistant Professor of Agronomy, Colorado State University; Professor of Agronomy, Research Agronomist, and Technical Assistant, Purdue University, respectively.

Received for publication March 22, 1979. Accepted for publication September 6, 1979.