Spatial Analysis- Scatter Grids

Scatter grids can be used to interpolate a continuous surface from values at distinct locations.

According to Tobler’s first law of geography "everything is related to everything else, but near things are more related than distant things" (Waldo R. Tobler, 1930).

Physical as well as social properties can be modelled into continuous surfaces.

A heat map for example is an interpolated temperature surface based on discrete temperature measurements at weather stations.

The Scatter Grid (Analysis > Grids) command Create Grid from Points dialog allows for the definition of a mode for the calculation of grid values (Sum, Interpolation, Closest point or Barnes interpolation), as well as the definition of the extent and resolution of the resulting model surface.

Cadcorp SIS Desktop will apply a linear interpolation to determine grid cell values from the input dataset.

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