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- W2161848987 abstract "Extraction of information from remotely sensed images would greatly benefit from increased use of spatial data. However, the utility of spatial data has been undermined by a lack of understanding of the nature and causes of observed spatial variation in images. One approach to this problem is to model the spatial variation in images as a function of ground scene and sensor parameters. Variograms are the tool used to link models of ground scenes to spatial variation in images. Explicit variograms are calculated for simple models of ground scenes consisting of randomly located discs on a continuous background. By incorporating the effect of the IFOV of the sensor through a process called regularization, explicit variograms for images of these scene models are derived. Verification of the explicit variograms is accomplished by simulating images that match the assumed scene model and sensor parameters and calculating empirical variograms for these images. For a simple scene model of randomly located discs on a continuous background, explicit and empirical variograms match, verifying the convergence of these two dissimilar approaches. The sensitivity of variograms is studied through varying parameters of scene models both in calculating explicit variograms and in simulating images. Results indicate direct ties between several scene parameters and the behavior of variograms. The height of the sill of the variogram is related to the density of objects. The range of influence is related to the size of objects. Increased variance in the size distribution of objects results in a more rounded shape in the variogram near the sill. Primary effects of increasing the units of regularization, or larger pixel size, are a decrease in the height of the sill and an increase in the range of influence." @default.
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- W2161848987 date "1988-08-01" @default.
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- W2161848987 title "The use of variograms in remote sensing: I. Scene models and simulated images" @default.
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- W2161848987 doi "https://doi.org/10.1016/0034-4257(88)90108-3" @default.
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