id	keyword
gc-980	soil
gc-980	data
gc-980	values
gc-980	modeling
gc-980	area
gc-980	distribution
gc-980	doi
gc-980	elements
gc-980	study
gc-980	maps
gc-980	mapping
gc-980	models
gc-980	km2
gc-980	methods
gc-980	environmental
gc-980	curvature
gc-980	digital
gc-980	kriging
gc-980	techniques
gc-980	target