To GEONET,
This message was originally responded directly to John Bell from Ting Dai. I
felt that Ting's response may be of benefit to all members of GEONET.
Regards,
Tom Cuthbertson
Geosoft Inc.
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Hi John:
To calculate the vertical derivative in OASIS MONTAJ, we first calculate the
upward continuation in distance of one grid cell size, then obtain the
vertical derivative from the difference of the original field and the upward
continuation field. The coefficients used to calculate the upward
continuation are from a text book, which are originally from the Table 2 of
Henderson's paper, Geophysics, v25, p573. ("R.G.Henderson, 1960, A
comprehensive system of automatic computation in magnetic and gravity
interpretation. Geophysics, v. 25, p.569-585." )
Please contact me if there are further questions.
Ting, Geosoft
-----Original Message-----
From: John Bell [mailto:[EMAIL PROTECTED]]
Sent: December 6, 1999 4:33 PM
To: [EMAIL PROTECTED]
Subject: [geonet]: Vertical Derivative Convolution
Hi
Does anyone know what Geosoft uses as the coefficients of the kernel which
is used to calculate the vertical derivative in OASIS MONTAJ ?. I have not
been able to find any documentation.
Regards
John
___________________________________________________
John Bell
M.Sc (Mineral Exploration Technologies) (Curtin); Pr. Sci. Nat.
Consulting Geophysicist
P.O. Box 77357
Fontainebleau
2032
South Africa
E-mail: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
Phone: +27 11 792 5010
Fax: +27 11 792 6244
Cell : +27 82 749456
___________________________________________________
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