Spatial variability
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Spatial variability occurs when a quantity that is measured at different spatial locations exhibits values that differ across the locations. Spatial variability can be assessed using spatial descriptive statistics such as the range.
Let us suppose that the Rev' z(x) is perfectly known at any point x within the field under study. Then the uncertainty about z(x) is reduced to zero, whereas its spatial variability still exists. Uncertainty is closely related to the amount of spatial variability, but it is also strongly dependent upon sampling.Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters".
Geostatistical analyses have been strictly performed to study the spatial variability of pesticide sorptionScript error: No such module "Footnotes".Script error: No such module "Check for unknown parameters".Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters".Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters". and degradationScript error: No such module "Footnotes".Script error: No such module "Check for unknown parameters". in the field. Webster and OliverScript error: No such module "Footnotes".Script error: No such module "Check for unknown parameters". provided a description of geostatistical techniques. Describing uncertainty using geostatistics is not an activity exempt from uncertainty itself as variogram uncertainty may be largeScript error: No such module "Footnotes".Script error: No such module "Check for unknown parameters". and spatial interpolation may be undertaken using different techniques.Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters".
References
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Literature
- Isaaks, E.H., Srivastava R.M.: Applied Geostatistics. 1989
- Fortin, Marie-Josee, Dale, Mark.: Spatial Analysis A Guide for Ecologists. 2005. Cambridge University Press, 365 pp.
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External links
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- http://gis.esri.com/library/userconf/proc05/papers/pap1184.pdf
- https://web.archive.org/web/20100110102738/http://willingtoncropservices.co.uk/case_study_GPS-soil-sampling-nutrient-mapping.htm Willington Crop Services shows spatial variability in action with Case Study on GPS soil sampling, GPS nutrient mapping and nutrient management.