Topic:
How does the residual algorithm work in Basemap Plus?

Description:
In Geoframe, how does the residual algorithm calculate its node values?	 

Solution:
Residual algorithm uses the same method as trend gridding but subtracts the 
trend grid from a conventional grid of the surface.  It highlights the anomalies 
from a trend grid.  It is useful to identify local changes in structure.



Last Modified on: 11-FEB-99