Interpolation is the name of the type of GIS research method that uses proximate observations to estimate values of a variable at places where the variable's value is unknown.
GIS refers to geographical observation system is a system that creates, manages, maps and analyzes all types of data. Basically it uses data that is attached to a unique location. It can help us see streets, vegetation, buildings and the like.
Interpolation serves the purpose of predicting values for cells in a raster from a limited number of sample data points. It can also be used to predict unknown values for any geographical point data, such as rainfall, elevation, noise levels and chemical concentrations.
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