Data Requirements for creating an interpolated surface

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Data Requirements for creating an interpolated surface

Data requirements for creating an interpolated surface

  • A point theme
    • Must contain at least three fields
      • Latitude
      • Longitude
      • Dependent variable (eg. rainfall / temperature)

    • Because 3 additional independent variables or covariates may be used:
      • The table must contain one field for each independent variable or covariate (eg. elevation)

  • A grid, preferably a DEM
    • A grid is required for ANUSPLIN to run, and it is also used to set the extent and cell size for output surfaces in 'Analysis / Properties'.(never > 3 decimal places)

  • Additional grids
    • Any additional independent variables or covariates must be represented by a grid as well as a field in the point themes table.

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