Variograms of Ancillary Data to Aid Sampling for Soil Surveys
作者： Ruth Kerry , Margaret A. Oliver
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摘要: To provide reliable estimates for mapping soil properties precision agriculture requires intensive sampling and costly laboratory analyses. If the spatial structure of ancillary data, such as yield, digital information from aerial photographs, electrical conductivity (EC) measurements, relates to that they could be used guide intensity surveys. Variograms permanent at two study sites on different parent materials were compared with each other those data. The ranges dependence identified by variograms both sets are similar orders magnitude site. Maps data appear show patterns variation these seem relate soil. Correlation analysis has confirmed relations. kriged sub-sampled original showed main preserved when a interval less than half average variogram range was used. Digital photographs years EC more consistent relation does yield. Aerial in particular bare soil, most useful often cheaper obtain yield
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