Hi Fatemeh, If you do not have the option mentioned by Michal then do the following:
Out of the grid filter menu, select analytic signal and the safe intermediate grids option. Run the filter. Use the grid math option to then sum the squares of the X and Y derivatives and take the square root. You have your total horizontal derivative. Rob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Saturday, July 05, 2014 11:29 AM To: Geosoft Oasis montaj and Target Subject: Re: [geonet] total horizontal derevative Hi Fatemeh As I mentioned you should use 'Gradient magnitude' (rather than 'Directional gradient') in the Horizontal gradient dialog box. Actually this feature was added only less than 2 years ago (or even less) if I'm not mistaken. If you have an old version, it might not have the 'Gradient magnitude' option. Best, Michal Quoting fatemeh <[email protected]>: > Hi Michal > > in this way I must insert direction of gradient! > But total horizontal derivative is root of sum Square horizontal > derivative in x and y direct! > --- > > Forum archives can be accessed here: > http://lyris.geosoft.com/read/?fourm=geonet > You are currently subscribed to geonet as: [email protected]. > To subscribe or unsubscribe from any of our forums, select the User > Forum selection on the Geosoft Community page: > http://www.geosoft.com/support/community --- Forum archives can be accessed here: http://lyris.geosoft.com/read/?fourm=geonet You are currently subscribed to geonet as: [email protected]. To subscribe or unsubscribe from any of our forums, select the User Forum selection on the Geosoft Community page: http://www.geosoft.com/support/community --- Forum archives can be accessed here: http://lyris.geosoft.com/read/?fourm=geonet You are currently subscribed to geonet as: [email protected]. To subscribe or unsubscribe from any of our forums, select the User Forum selection on the Geosoft Community page: http://www.geosoft.com/support/community
