A digital camera as a tool to measure colour indices and related properties of sandy soils in semi-arid environments

Levin, N., Ben-Dor, E. and Singer, A. (2005) A digital camera as a tool to measure colour indices and related properties of sandy soils in semi-arid environments. International Journal of Remote Sensing, 26 24: 5475-5492. doi:10.1080/01431160500099444


Author Levin, N.
Ben-Dor, E.
Singer, A.
Title A digital camera as a tool to measure colour indices and related properties of sandy soils in semi-arid environments
Journal name International Journal of Remote Sensing   Check publisher's open access policy
ISSN 0143-1161
1366-5901
Publication date 2005-12-01
Sub-type Article (original research)
DOI 10.1080/01431160500099444
Open Access Status Not yet assessed
Volume 26
Issue 24
Start page 5475
End page 5492
Total pages 18
Place of publication Abingdon, Oxfordshire, United Kingdom
Publisher Taylor & Francis
Language eng
Formatted abstract
Soil colour carries important information regarding the soil's chemical and physical properties. However, common practices for measuring soil colour, either by Munsell charts or by field/laboratory spectrometers, are insufficient, due to the subjective and nonquantitative character of the Munsell charts, and to the high cost and inconvenience of field spectrometers. We present herein, a method to characterize the colour of soil samples, and related chemical and physical properties of the soil, using a digital camera, and an array of coloured plastic chips, that are used for calibration purposes. Using 370 samples of sandy soils, we have demonstrated that both RGB values from digital images and their derived soil indices, correlate highly with similar measurements performed by a field spectrometer. When checked against free iron oxide content and against the percentage of fine particles in a sub-sample set of 42 soils, the redness index as measured by the digital camera gave similar or better correlations than those obtained from a field spectrometer, against both free iron oxides and fine particle contents (R2 of 89% for the iron oxides, and of 81% for the fine particles). We propose the use of a digital camera as a field analytical tool to determine precisely: soil colour, iron oxide and fine particle content. Further study in this direction, with other soil population and more soil properties, is strongly advised in order to launch this as a vastly applicable and generic method.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Geography, Planning and Environmental Management Publications
 
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