SOIL REFLECTANCE MEASUREMENT USING A PHOTOGRAPHIC METHOD

The albedo of two soils, Avondale clay loam and Yuma sand dunes, was determined using a panchromatic film in a hand-held 35-mm camera. Samples with different volumetric moisture content, from air dry to saturation, were compared to calibrated reference surfaces of evenly distributed tones of gray. For the limited spectral sensitivity of the detector (panchromatic film), a correction factor K' was derived graphically from known spectral reflectance of a different soil. The albedo is given by the product of the correction factor and the fraction of the reflected radiation that contributes to the detector signal. The results obtained by the photographic method were in good agreement with results obtained by conventional radiometric methods for Yuma sand dunes, but larger differences were found between radiometry and photography for Avondale clay loam.

• Corporate Authors:

  Soil Science Society of America

  677 South Segoe Road
  Madison, WI  United States  53711
• Authors:
  • Gold, A
  • Asher, J B
• Publication Date: 1976-5

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 337-341
• Serial:
  • Soil Science Society of America Journal
  • Volume: 40
  • Issue Number: 3
  • Publisher: Soil Science Society of America

Subject/Index Terms

• TRT Terms: Clay; Detectors; Moisture content; Radiometers; Reflectivity; Sand; Spectrum analysis
• Old TRIS Terms: Panchromatic film; Radiometric method; Spectral reflectance
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00139298
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 16 1976 12:00AM