AM-28 - Semi-variogram modeling
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- List the possible sources of error in a selected and fitted model of an experimental semi-variogram
- Describe the conditions under which each of the commonly used semi-variograms models would be most appropriate
- Explain the necessity of defining a semi-variogram model for geographic data
- Apply the method of weighted least squares and maximum likelihood to fit semi-variogram models to datasets
- Describe some commonly used semi-variogram models
CV-04 - Scale and Generalization
Scale and generalization are two fundamental, related concepts in geospatial data. Scale has multiple meanings depending on context, both within geographic information science and in other disciplines. Typically it refers to relative proportions between objects in the real world and their representations. Generalization is the act of modifying detail, usually reducing it, in geospatial data. It is often driven by a need to represent data at coarsened resolution, being typically a consequence of reducing representation scale. Multiple computations and graphical modication processes can be used to achieve generalization, each introducing increased abstraction to the data, its symbolization, or both.