1. Research Group Soil Spatial Inventory Techniques, Dep. of Soil Management; Ghent Univ.; Coupure 653 9000 Gent Belgium
2. Dep. of Soil Science, Faculty of Agriculture; Univ. of Peradeniya; Sri Lanka
3. Geo Solutions; Veldkant 37 2550 Kontich
4. Lab. of Forest Management and Spatial Information Techniques; Ghent Univ.; Coupure 653 9000 Gent Belgium