Results 101 to 110 of about 6,324 (226)
Analysis of Large Scale Spatial Variability of Soil Moisture Using a Geostatistical Method
Sensors, 2010 Spatial and temporal soil moisture dynamics are critically needed to improve the parameterization for hydrological and meteorological modeling processes.
Reza Khanbilvardi +5 more
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Least squares variogram fitting by spatial subsampling
, 2002 Least squares methods are popular for fitting valid variogram models to spatial data. The paper proposes a new least squares method based on spatial subsampling for variogram model fitting.
Yoon Dong Lee, Soumendra N. Lahiri
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A comparison of approaches for valid variogram achievement [PDF]
, 2005 Variogram estimation is a major issue for statistical inference of spatially correlated random variables. Most natural empirical estimators of the variogram cannot be used for this purpose, as they do not achieve the conditional negative-definite ...
Febrero-Bande, Manuel +2 more
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Accounting for Geometric Anisotropy in Sparse Magnetic Data Using a Modified Interpolation Algorithm
Remote SensingThe construction of a high-precision geomagnetic map is a prerequisite for geomagnetic navigation and magnetic target-detection technology. The Kriging interpolation algorithm makes use of the variogram to perform linear unbiased and optimal estimation ...
Haibin Li +11 more
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Providing a subsurface reservoir quality maps in oil fields by geostatistical methods
Geodesy and Cartography, 2013 Under study reservoir oilfield is located south-west of Iran. This field is comprised of naturally fractured Asmari and Bangestan formation. Reservoir management and characteristic evaluation of this field requires good knowledge of reservoir rock and ...
Hakimeh Amanipoor
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, 2018 (A) River pattern flow NW to SW direction, (B) Sinuosity of mountain front (Smf) to determine the class of tectonic activity level and valley ratio index (Vf) to determine the uplift class.
Herry Riswandi (5296310)
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Kriging algorithm for mapping the gravimetric data in the north of Algeria
Geodetski VestnikThe purpose of this work is to analyze and validate the gravimetric information in the study area in order to highlight the valid data for mapping the gravity anomaly from a grid generated by interpolation. In this context, we have performed a first step
Ilies Benikhlef +2 more
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, 1997 The variogram is a basic tool in geostatistics. It expresses the variability between pairs of observations as a function of their separation vector.
Ecker, Mark David
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Points and line representing the empirical and fitted variogram, respectively.
, 2014 Parameters for the fitted spherical variogram include: partial sill = 0.79, nugget = 2.4 and range = 250.3 m (A). Permutation test of the variogram, which determines the general range of values that could occur due to random chance.
Ethan A. Wilson (659383) +2 more
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The Spatial Distribution of Tree Dieback Affected by Mistletoe in Relation to their Crown Characteristics [PDF]
جغرافیا و پایداری محیط, 2016 1- Introduction One of the main problems in The Zagros Forests is oak trees dieback. What is really certain and important is the fact that the tree dieback crisis caused the declining of oak in oak forest of Zagros. Oak decline is characterized by crown
Erfan Boshkar +2 more
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