منابع مشابه
Verification with Variograms
The verification of a gridded forecast field, for example, one produced by numerical weather prediction (NWP) models, cannot be performed on a gridpoint-by-gridpoint basis; that type of approach would ignore the spatial structures present in both forecast and observation fields, leading to misinformative or noninformative verification results. A variety of methods have been proposed to acknowle...
متن کاملInference for variograms
The empirical variogram is a standard tool in the investigation and modelling of spatial covariance. However, its properties can be difficult to identify and exploit in the context of exploring the characteristics of individual datasets. This is particularly true when seeking to move beyond description towards inferential statements about the structure of the spatial covariance which may be pre...
متن کاملEstimating and Modeling Space-Time Variograms
Abstract As with a spatial variogram or spatial covariance, a principal purpose of estimating and modeling a space-time variogram is to quantify the spatial temporal dependence reflected in a data set. The resulting model might then be used for spatial interpolation and/or temporal prediction which might take several forms, e.g. kriging and Radial Basis functions. There are significant problems...
متن کاملDirectional MAP to Adaptive Edge Detection by using Variograms
In this study, we suggest a new approach to the detection of edge orientation in order to guide a choice of the appropriate directional filter. This approach aims at analysing variograms properties such as the directionality, the renewal period of texture pattern and size of objet. The use of variograms enable to define directional MAP and to determine the edge orientation of the object in orde...
متن کاملUsing variograms to detect and attribute hydrological change
There have been many published studies aiming to identify temporal changes in river flow time series, most of which use monotonic trend tests such as the Mann–Kendall test. Although robust to both the distribution of the data and incomplete records, these tests have important limitations and provide no information as to whether a change in variability mirrors a change in magnitude. This study d...
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ژورنال
عنوان ژورنال: Weather and Forecasting
سال: 2009
ISSN: 1520-0434,0882-8156
DOI: 10.1175/2009waf2222122.1