Re: gradient filter/formula

[Christopher Campbell]

Ken -- suggest you compute a horizontal gradient of the total or residual magnetic field and then image that. You should be able to do this in the fourier domain ... magHG = SQRT(SQR(magX)+SQR(magY)) where magX and magY are the X-direction and Y-direction gradients of the magnetic field, respectively.

Kit Campbell.


At 03:06 PM 04/12/01 -0800, you wrote:

G'day all
 
I have a friend who has some aeromagnetic data of an area she is studying. We want to look for edges between granite bodies with slight differences in magnetic intensity. What filters/formula in ERMapper are best to look for edges between granite bodies (ie., zones of max gradient) in all horizontal directions in the plane of the earth's crust? and would I be better doing the filtering in Fourier space? (if so what filter should I use there?).
 
Thanks in advance
Ken Hickey

 

Intrepid Geophysics Ltd.
4505 Cove Cliff Road
North Vancouver, BC
Canada V7G 1H7

Tel.    +1.604.924.1070
Fax.    +1.604.924.1370
Cell    +1.604.312.1371
E-mail: [EMAIL PROTECTED]
Web:            www.intrepid-geophysics.com