Reduction of soil water spatial sampling density using scaled semivariograms and simulated annealing

Ferreyra, R. A.; Apezteguía, Hernán Patricio; Sereno, Roberto; Jones, J. W.

doi:10.1016/s0016-7061(02)00234-3

Cited by 54 publications

(26 citation statements)

References 36 publications

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“…A few studies have investigated optimized sampling designs in relation to maximizing prediction efficiency for the analysis of spatial variability in assessing soil properties and crop yields, specifically (Van Groenigen, 2000;Ferreyra et al, 2002). However, these studies have not compared thematic maps generated by the initial sampling grid or by the optimized sampling design using similarity measures (Guedes et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Optimization of Sample Design Sizes and Shapes for Regionalized Variables Using Simulated Annealing

2014

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The spatial variability of structures in regionalized variables are defined with the aid of geostatistical techniques, which facilitate the estimation of values for these variables in unsampled localizations and generate thematic maps to be used in decision making for localized treatments in the area under study. The quality of these maps depends on the trustworthiness of these estimates that can be modified with the choice for the sample design. The objective of this work was to establish an optimal size and shape of the sample designs in order to enhance the efficiency of sampling plans for the prediction of space dependent variables. These designs were obtained with the use of a stochastic search method called Simulated Annealing. This method is based on a sampling grid with a large number of points. Here, it is initially used to consider simulated data sets with distinct spatial dependence structures and is then used to consider real data on soy productivity. The simulated results are used as reference for the achievement of the best sample design with the lowest number of sample points that can efficiently represent the spatial dependence structure of soy productivity in a commercial area harvested by the harvester monitor. The results reported for the simulations and soy productivity data show that the optimization process was efficient in determining sample designs with reduced size, especially when using the Global Accuracy as the measurement to be maximized.

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Section: Introductionmentioning

confidence: 99%

Optimization of Sample Design Sizes and Shapes for Regionalized Variables Using Simulated Annealing

2014

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“…Temporal stability also offers a valuable tool in monitoring site selection (Comegna & Basile, 1994;Ferreyra et al, 2002;Grant et al, 2004;Martínez-Fernández & Ceballos, 2005;Cosh et al, 2006;Starks et al, 2006). This is especially true as mechanistic hydrological models, necessary for solute and sediment transport models drive the need for an increased understanding of the direction and velocity of subsurface water flow (Lin, 2006).…”

Section: Hydrology Of Soil Typesmentioning

confidence: 99%

A review of advances in hydropedology for application in South Africa

Huyssteen

2008

South African Journal of Plant and Soil

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Hydropedology is internationally a new and fast-growing science. It is therefore pertinent to take heed of developments in this regard to guide current and future research in South Africa. This paper aims to discuss the initiation and advances in the interdisciplinary science of hydropedology. Hydropedology has been defined to interlink pedology, soil physics, and hydrology to bridge scales and to transform soil survey data into soil hydraulic information. As such hydropedology could contribute to the understanding of various environmental and ecological issues. In this regard pedotransfer functions relate simple soil characteristics (e.g. morphological features) to more complex parameters (e.g. soil hydraulic properties) that are relatively difficult to measure. The hydrology of soil types (HOST), published in the United Kingdom to aid hydrological studies and analyses, is a good working example of a pedotransfer function. HOST is based on three conceptual models of water flow processes in the soil: soil on a permeable substrate with a deep aquifer (>2 m); soil on permeable substrate with a shallow water table (<2 m); and soil with an impermeable or semi permeable layer within 1 m of the surface. The three conceptual models are further subdivided into 11 models, which can be subdivided into 29 HOST classes. A useful tool for the summation of long-term soil water content data is the temporal stability of spatially measured soil water contents which is defined as the time invariant average of spatially measured soil water contents and offers a valuable method to study the relationship between soil and water. It has been used to reduce the number of measurements needed in catchment characterization and is therefore also a valuable tool in site selection. Understanding redox reactions in soil and the influence thereof on the development of redoximorphic colour patterns, are vital in discerning the relationship between soil water regime and soil morphology. Redoximorphic colour patterns are manifested as redox depletions and/or redox accumulations. The former is evident as grey matrices, cutans, mottles, or pore linings, while the latter is evident as Fe masses, pore linings, nodules, or concretions.

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“…Ferreyra et al (2002) used the SANOS software to reduce the number of soil moisture samples having as secondary tool for decision making the scaled semivariogram. Siqueira et al (2015b) studied different sampling schemes and soil water contents.…”

Section: Introductionmentioning

confidence: 99%

Spatial soil sampling design using apparent soil electrical conductivity measurements

et al. 2016

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Reduction of soil water spatial sampling density using scaled semivariograms and simulated annealing

Cited by 54 publications

References 36 publications

Optimization of Sample Design Sizes and Shapes for Regionalized Variables Using Simulated Annealing

Optimization of Sample Design Sizes and Shapes for Regionalized Variables Using Simulated Annealing

A review of advances in hydropedology for application in South Africa

Spatial soil sampling design using apparent soil electrical conductivity measurements

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