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Table 2. Gridding methods and elliptical search
radii for both sampling routes and grid types |
| Route |
Grid
Type |
Grid Size |
Grid Limits |
No. of
Grids |
Gridding Method |
Search Radii |
Anisotropy |
MB
and
MC |
Single
year |
x = 17.38 km;
y = 15.22 days |
x = 0-452 km;
y = 0-365.25 days |
x = 27;
y = 25 |
Kriging:
*linear variogram
*no nugget effect
*nearest 50 neighbors
*data outside grid used
*no smoothing
*blank grid if less than four values in search |
x = 60 km;
y = 70 days |
1:1 circular search of scaled data |
MB
and
MC |
Base
period |
x = 17.38 km;
y = 15.22 days |
x = 0-452 km;
y = 0-365.25 days |
x = 27;
y = 25 |
Inverse distance weighting:
*weighting factor = 2
*nearest 200 neighbors
*data outside grid used
*duplicates averaged
*no smoothing |
x = 30 km;
y = 35 days |
1:1 circular search of scaled data |