In this paper, we compare the global accuracy of different strategies to build response surfaces by varying sampling methods and modeling techniques. The final application of the response surfaces being aerodynamic shape optimization, the test cases are issued from CFD simulations of aerodynamic coefficients. For comparisons, a robust strategy for model fit using a new efficient initialization ...

Tea fields emit large amounts of nitrous oxide (N2O) to the atmosphere. Obtaining accurate estimations of N2O emissions from tea-planted soils is challenging due to strong spatial variability. We examined the spatial variability in N2O emissions from a red-soil tea field in Hunan Province, China, on 22 April 2012 (in a wet season) using 147 static mini chambers approximately regular gridded in ...

18 Tea fields emit large amounts of nitrous oxide (N2O) to the atmosphere. Obtaining accurate 19 estimations of N2O emissions from tea-planted soils is challenging due to strong spatial 20 variability. We examined the spatial variability of N2O emissions from a red-soil tea field in 21 Hunan province, China, on 22 April 2012 (in a wet season) using 147 static mini chambers 22 approximately regu...

This article focuses on the estimation and design aspects of a bivariate collocated cokriging experiment. For large class covariance matrices, linear dependency criterion is identified, which allows best unbiased estimator primary variable in setup to reduce univariate kriging estimator. Exact optimal designs for efficient prediction such simple ordinary reduced models with one-dimensional inpu...

Fundamental to the philosophy of Precision Agriculture (PA) is the concept of matching inputs to needs. Recent research in PA has focused on use of Management Zones (MZ) that are fi eld areas characterised by homogeneous attributes in landscape and soil conditions. Proximal sensing (such as Electromagnetic Induction (EMI), Ground Penetrating Radar (GPR) and X-ray fl uorescence) can complement d...

Lidar data provide accurate measurements of forest canopy structure in the vertical plane however current lidar sensors have limited coverage in the horizontal plane. Landsat data provide extensive coverage of generalized forest structural classes in the horizontal plane but are relatively insensitive to variation in forest canopy height. It would therefore be desirable to integrate lidar and L...

nowadays, much attention has been paid on using geostatistical methods for estimation of spatial parameters, either using the variables of these parameters (kriging) or auxiliary variables (cokriging), in water and soil sciences. the quality of ground water for agriculture is very important; however, it is expensive and time consuming to measure parameters such as sar, na, ca, th, tds and ec. t...

1. Adhikary S.K., Muttil N., Yilmaz A.G., 2017, Cokriging for enhanced spatial interpolation of rainfall in two Australian catchments, Hydrological Processes, 31 (12), 2143-2161, DOI: 10.1002/hyp.11163. CrossRef Google Scholar