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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