3.1 Geospatial Interpolation
The geo-statistical techniques are different from the classical statistical techniques. Geo-statistical methods are more reliable here because these methods assume that there is an auto correlation among the data sets. When precipitation occurs, it is obvious that the area closer to them will also be getting ample amount of rainfall, thus it indicates that there is always some relation for the precipitation data in the region surrounded by an area experiencing precipitation.
ArcGIS uses geo statistical extension to incorporate geospatial interpolation. There is several interpolation techniques that this extension provides all of which are based on the same principle of Tobler law. It states that all things are inter-related while things that are nearer are more similar among themselves as compared to things which are distant from each other. Therefore, geo-statistical interpolation is based on notion of spatial autocorrelation. When the interpolation is done using this technique first it determines the spatial autocorrelation among the spatial data. The correlation determines
All the interpolation methods give different result. No two methods will give same result.