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Abstract
Modern earthwork compaction rollers collect location and compaction information as
they traverse a compaction site. These data are indirectly observed through non-linear
measurement operators, inherently multivariate with complex correlation structures,
and collected in huge quantities. The nature of such data was investigated at a large,
atypically compacted test bed in Florida, USA. Exploratory analysis of this data through
detrending and empirical semivariogram estimation is performed. A second analysis
using a sequential, spatial backfitting algorithm is used to investigate the importance
of driving direction of the roller.