21 January 2016

Comparison between «Local» and «Regional» spectrometric soil total carbon models calibrated in Djerid arid area.

Abstract

2

Visible-Near infrared spectroscopy is nowadays recognized as a promising tool for predicting soil properties. In  Djerid arid area (5600 km², south westeren Tunisia), Our purpose  was to compare total carbon  prediction performance  of two calibration procedures : “local” versus “regional”. Within  Djerid three spatially distinct sites,  to, covered by three QuickBird satellite images (Shamsa : 2800 ha, Oudia : 2800 ha and Oung : 2548 ha), we have collected respectively 30, 29 and 30 samples according to a parsimonious sampling strategy that  integrated QuickBird images data. Principal component analysis were applied for each dataset to explore samples variabilities. Then, three local models and one regional model were calibrated respectively, based on samples collected in each site and on samples collected in the three sites once gathered in one regional dataset. Local models were effective for the first two sites and poor for the third. Besides, performances declined noticeably when a local model was used to predict samples collected on the two other sites what testifies a limited geographical robustness of these local models.The regional model was acceptable. Its quality can be improved once recalibrated on larger samples set collected from further Djerid sites.

Key words: spectroscopy, arid region, local model, regional model, total carbon, QuickBird.

Writer

H. Aïchi1

H. Aïchi1 , Y. Fouad2, , Z. Lili Chabaane3, M. Sanaa3, H. Nicolas2, C. Walter2 1Ecole supérieure d’agriculture de Mograne, 1121 Zaghouan, Tunisie. 2Agrocampus Ouest – INRA, UMR 1069 SAS, 65 rue de St Brieuc, CS 84215, 35042 Rennes, France. 3Institut Nationale Agronomique de Tunisie, 43, Avenue Charles Nicolle 1082 Tunis, Tunisie.

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