RE: [geonet]: geosoft default smoothing

[Ian MacLeod]

Aaron,   The Geosoft default grid display treats each grid point as just that, a point.  The collection of grid points defines a smoothly varying surface, and the colour of any pixel on a display will depend on the Z mapping of that pixel on this smooth surface.  The smooth surface is in fact made up of piece-wise linear interpolations between grid points.  Note also that the surface will always extend 1/2 a grid cell dimension beyond an edge grid point.   If you choose "No smoothing", we treat each grid point as a flat-topped cell that extends 1/2 a cell dimension in X and Y from the point position.  Colouring of such a surface just takes the Z value of the nearest grid point, so you effectively see the grid cell edges when you zoom in.   Regards, Ian _______________ Geosoft Inc. Ian MacLeod [EMAIL PROTECTED] -----Original Message----- From: skyhunter [mailto:[EMAIL PROTECTED]] Sent: Tuesday, February 12, 2002 11:31 AM To: GEONET Subject: [geonet]: geosoft default smoothing Hi,   Can anyone help me to understand what geosoft does when you display a grid image as GEOSOFT(Default) as opposed to GEOSOFT(no smooting). I understand that displaying a grid as GEOSOFT(default) involves some kind of smoothing and GEOSOFT(no smoothing) displays the raw grid showing all the individual cells. I have no idea how the GEOSOFT(default) grid gets rid of the tesselations of the individual cell sizes.     Aaron Balasch Sky Hunter Technologies Inc. Suite 101, 1725 10th Avenue S.W. Calgary, Alberta T3C 0K1 email: [EMAIL PROTECTED] phone: 403-228-2175 fax: 403-244-7955