Using scattered hyperspectral imagery data to map the soil properties of a region

European Journal of Soil Science - Tập 63 Số 1 - Trang 110-119 - 2012
Philippe Lagacherie1, Jean‐Stéphane Bailly2,1,3, Pascal Monestiez4, Cécile Gomez1
1UMR LISAH - Laboratoire d'étude des Interactions Sol - Agrosystème - Hydrosystème (Bâtiment 24 2 place Pierre Viala 34060 Montpellier cedex 1 France - France)
2AgroParisTech (22 place de l'Agronomie CS 20040 91123 Palaiseau cedex - France)
3UMR TETIS - Territoires, Environnement, Télédétection et Information Spatiale (Maison de la télédétection - 500 rue Jean-François Breton - 34093 Montpellier Cedex 5 - France)
4BioSP - Biostatistique et Processus Spatiaux (Site Agroparc Domaine St Paul 84914 Avignon cedex 9 - France)

Tóm tắt

Airborne hyperspectral imagery has been recently proved to be a successful technique for predicting soil properties of the bare soil surfaces that are usually scattered in the landscape. This new soil covariate could much improve the digital soil mapping (DSM) of soil properties over larger areas. To illustrate this, we experimented with digital soil mapping in a 24.6‐km2area located in the vineyard plain of Languedoc. As input data, we used 200 points with clay content measurements and 192 bare soil fields representing 3.5% of the total area in which the clay contents of the soil surface were successfully mapped at 5‐m resolution by hyperspectral remote sensing. The clay contents were estimated from CR2206, a spectrometric indicator that quantifies specific absorption features of clay at 2206 nm. We demonstrated by cross‐validation that the co‐kriging procedure based on our co‐regionalization model provided accurate error estimates at the clay measurement sites. Then, we applied a block co‐kriging model to map the mean clay content at increasing resolutions (50 , 100, 250 and 500 m). The results showed the following: (i) using hyperspectral data significantly increased the accuracy of the mean clay content estimations; (ii) a block co‐kriging procedure with reliable estimates of error variance can be used to estimate mean clay contents over larger areas and at coarser resolutions with acceptable and predictable errors and (iii) various maps can be produced that represent different compromises between prediction accuracy and spatial resolution.

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European Journal of Soil Science

Tập 63 Số 1

110-119

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