Dear members,
analysing a set of data, in which positive values, located in the middle of
the investigated area, are surrounded by null values, I obtained non- zero
values outside of the investigated area (what I called here a border
effect). My variogram is a simple exponential model with no
Dear Gregoire,
Extrapolation is always hazardous.
If the search window includes some of these positive values,
you should expect that the kriging estimate is non-zero
since more likely these values are assigned a non-zero
kriging weights. Remember that even if observations are
located beyond the
