Comparing mapping approaches at subcatchment scale in northern Thailand with emphasis on the Maximum Likelihood approach

Auteur(s) et Affiliation(s)

SCHULER, U.

Federal Inst. for Geosciences and Natural resources (BGR), B2.2 Spatial Information Soil and Water, Hannover, Allemagne

HERRMANN, L.

Univ. of Hohenheim, Inst. of Soil Science and Land Evaluation, Stuttgart, Allemagne

INGWERSEN, J.

Univ. of Hohenheim, Inst. of Soil Science and Land Evaluation, Stuttgart, Allemagne

ERBE, P.

The Uplands Program, Fac. of Agriculture, Univ., Chiang Mai, Thailande

STAHR, K.

Univ. of Hohenheim, Inst. of Soil Science and Land Evaluation, Stuttgart, Allemagne

Description :
This study compares different soil mapping approaches in three different petrographic areas in order to test their suitability for regional mapping in northern Thailand. Sampling was based on transects or grid-based randomization. Maps were created based on expert knowledge (eye fitting) or using Classification Tree (CART algorithm) or the Maximum Likelihood approach. In addition, local knowledge-based-soil maps were created. Validation was performed using soil reference maps and independent sampling points. Among the mapping approaches investigated only the Maximum Likelihood approach and the Classification Tree method are suitable for upscaling procedures. It seems to be most useful to combine the different approaches in particular with the SOTER approach (FAO, 1995).

Type de document :
Article de périodique

Source :
Catena (Giessen), issn : 0341-8162, 2010, vol. 81, n°. 2, p. 137-171, nombre de pages : 35, Références bibliographiques : 38 ref.

Date :
2010

Editeur :
Pays édition : Allemagne, Cremlingen-Destedt, Catena

Langue :
Anglais