Randommeasurement errors in digital terrain models are important to their quality. The present paper describes an untypical use of variograms to compute this kind of measurement errors. After subtracting a low frequency drift from depth/height measurements, a variogram analysis of the residuals is used to derive the random measurement errors of the observations. Numerical experiments on laserca...

The spatial variation and distribution features of the metals tested in the surface runoff in Xikuangshan Bao Daxing miming area were analyzed by combining statistical methods with a geographic information system (GIS). The results showed that the maximum concentrations of those five kinds of the metals (Sb, Zn, Cu, Pb, and Cd) in the surface runoff of the antimony mining area were lower than t...

Spatial estimations are increasingly used to estimate geocoded ambient particulate matter (PM) concentrations in epidemiologic studies because measures of daily PM concentrations are unavailable in most U.S. locations. This study was conducted to a) assess the feasibility of large-scale kriging estimations of daily residential-level ambient PM concentrations, b) perform and compare cross-valida...

Researchers are increasingly able to capture spatially referenced data on both a response and a covariate more frequently and in more detail. A combination of geostatisical models and analysis of covariance methods may be used to analyze such data. However, very basic questions regarding the effects of using a covariate whose support differs from that of the response variable must be addressed ...

VESPER 1.5 is a shareware software program, written to provide rigourous spatial prediction techniques for the precision agriculture industry. It offers a range of options to deal with data sets of varying data density, spatial distribution, and observation uncertainty. Such data sets are now gathered from a range of realtime yield, soil and crop sensors and through manual sampling regimes. Spe...

BACKGROUND Melioidosis is a frequently fatal infectious disease caused by the soil dwelling Gram-negative bacterium Burkholderia pseudomallei. Environmental sampling is important to identify geographical distribution of the organism and related risk of infection to humans and livestock. The aim of this study was to evaluate spatial distribution of B. pseudomallei in soil and consider the implic...