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Table 1 Parameters using in the interpolation model

From: Geostatistical interpolation model selection based on ArcGIS and spatio-temporal variability analysis of groundwater level in piedmont plains, northwest China

Interpolation model Parameter P or smooth coefficienta Maximum number of prediction points within the search radius Minimum number of prediction points within the search radius Orientation angleb
IDW 1.1102 16 9 0
GPI 2
LPI 1 14 11 0
TSPLINE 1 15 10 0
OK 0.12 13 9 45
SK 0.138 5 2 0
UK 1 30 20 45
  1. aThe order that is used to calculate exponential value in the weighting formula or optimal fitting polynomial
  2. bSearch direction angle within the search radius