Mapping gamma radiation and its uncertainty from weathering products in a Tasmanian landscape with a proximal sensor and random forest kriging

Auteur(s) et Affiliation(s)

VISCARRA ROSSEL, R.A.

CSIRO Land and Water, Canberra, Australie

WEBSTER, R.

Rothamsted Research, Hertfordshire, Harpenden, Royaume-Uni

KIDD, D.

Dept. of Primary Industries, Parks, Water and Environment, Tasmania, Australie

Description :
The AA. aim to illustrate the problem of mapping gamma radiation of a fairly large region, on the Meander Valley Irrigation Area in central Northern Tasmania, with a mobile radiometer sensing a few tens of centimeters above the land surface moving along widely spaced short transects. They describe the sampling, their means of spatial prediction using random forests plus regression kriging (RF + RK) from the sparse data and the non-parametric spatial bootstrap used to estimate the variances from their RF + RK models and to quantify the uncertainties of the spatial modelling. The maps show the complexity of the region in terms of soil, lithology and terrain, and they show the merits of gamma radiometry for mapping and understanding the distribution of materials in such regions.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2014, vol. 39, n°. 6, p. 735-748, nombre de pages : 14, Références bibliographiques : 1 p.

Date :
2014

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais