GIS Dictionary
Definitions for GIS terms related to operations such as analysis, GIS modeling and web-based GIS, cartography, and Esri software.
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interpolation
See Also:
inverse distance weighted interpolation,
kriging,
natural neighbors,
trend surface analysis
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[mathematics]
The estimation of surface values at unsampled points based on known surface values of surrounding points. Interpolation can be used to estimate elevation, rainfall, temperature, chemical dispersion, or other spatially-based phenomena. Interpolation is commonly a raster operation, but it can also be done in a vector environment using a TIN surface model. There are several well-known interpolation techniques, including spline and kriging. 
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[ESRI software]
In the context of linear referencing, the calculation of measure values for a route between two known measure values.
