Dear All,
 I intend to fit spatial covariance structure model to geostatistical data
with yield as attribute component and longitude and latitude as spatial
component. I plotted the point locations using projected coordinates
easting and northing after conversion into UTM. It is hard for me to
visualize the pattern/trend due to large number of observations. Do I
assume the presence of trend by regressing the yield as function of easting
and northing to remove the trend? If yes, the empirical semivariogram can
now be fitted on the residual.
Must we always remove the trend for any geostatistical data?


Look forward to reading your response, please.

Thanks
Moshood

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