Some considerations on methods for spatially aggregating and disaggregating soil information
Some considerations on methods for spatially aggregating and disaggregating soil information
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DOI：
10.1023/a:1009778500412
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发表时间：
1998-03-01
影响因子：
3.1
通讯作者：
McBratney, AB
中科院分区：
文献类型：
--
作者：
McBratney, AB
作为更详细讨论的开端，提出了一些可能的土壤数据和信息的汇总和分类方法。讨论了层次、粒度、范围、尺度和变异性等概念。Hoosbeek-Bryant方案的轻微修改，以处理空间和时间尺度和各种类型的定量模型的建议。审查了汇总或升级的方法。讨论了代表性基本体积（REV），变异函数，分形理论，多分辨率分析，临界点现象，重整化群和传递函数的贡献，然后简要介绍了一些生态方法，包括外推集总，外推增加模型范围和外推显式积分。必须明确区分可加变量和非可加变量。前者的缩放比后者的问题要小得多。任何通过对合计值进行测试的方法似乎都存在问题。分解或降尺度的方法，包括传递函数，质量保持或密度方法进行了讨论。为了在数量上取得进展，需要对土地信息系统中的数据进行嵌套抽样或重新分析，以获得整个范围的方差信息。最后呼吁工作开始的定量尺度明确的土壤变异理论。
Some possible approaches to the aggregation and disaggregation of soil data and information are presented as an opener to the more detailed discussion. The concepts of hierarchy, grain, extent, scale and variability are discussed. Slight modifications to the Hoosbeek-Bryant scheme to deal with spatial and temporal scales and various types of quantitative models are suggested. Approaches to aggregation or upscaling are reviewed. The contributions of representative elementary volume (REV), variograms, fractal theory, multi-resolution analysis using wavelets, critical point phenomena, renormalisation groups and transfer functions are discussed followed by a brief presentation of some ecological approaches including extrapolation by lumping, extrapolation by increasing model extent and extrapolation by explicit integration. A clear distinction must be made between additive and nonadditive variables. The scaling of the former is much less problematic than the latter. Corroboration of any approach by testing against the aggregated values seems problematic. Methods of disaggregation or downscaling including transfer functions, mass-preserving or pycnophylactic methods are also discussed. In order to make quantitative advances, nested sampling or reanalysis of data in land information systems to obtain variance information over a complete range of scales is required. Finally an appeal is made for work to begin on a quantitative scale-explicit theory of soil variation.