Ian,
No, I didn't send the e-mail at 4:45am. My e-mail time stamp shows 8:02 am.
Must be our or your mail-server which transfers the date incorrectly.
Regarding the solution, sorry that I responded before reading Louis's mail.
That was hidden in filters! Now we know it ...
Cheers,
mansour
> -----Original Message-----
> From: Ian MacLeod [SMTP:[EMAIL PROTECTED]]
> Sent: July 16, 1999 9:08 AM
> To: '[EMAIL PROTECTED]'
> Subject: RE: [geonet]: Calculating time difference ...
>
> Mansour and Geonet...
>
> Mansour - did you really send that e-mail at 4:45am?
>
> We are good at hiding things in the menus (sorry). There is a differences
> GX in the X-Utility/Filters menu. Select 1 difference, no normalization.
>
> However, as Louis pointed out, this changes the start location of the
> difference channel by one-half a sample separation. Another way to use
> the
> convolution filter and obtain the same sampling is to use asymmetric
> filters
> line (0,1,-1) or (-1,1,0), which place the difference between the current
> point and the next or previous respectively in the result channel without
> the apparent sample shift.
>
> 34 degrees Celsius today to Toronto to those international geoneters that
> still think we live in igloos...
>
> Cheers,
> Ian
>
> _______________
> Geosoft Inc.
> Ian MacLeod
> [EMAIL PROTECTED]
> (416) 369 0111 x323
>
> Geosoft: Spatial Data Processing and Analysis Solutions
> http://www.geosoft.com
>
>
> -----Original Message-----
> From: Mansour Shoari [mailto:[EMAIL PROTECTED]]
> Sent: Friday, July 16, 1999 5:02 AM
> To: 'GeoNetters@Geosoft'
> Subject: [geonet]: Calculating time difference ...
>
>
> David,
>
> You asked: " ... but don't see how to get the time difference ...".
>
> 1. Create a channel in your GDB (dummytime).
> 2. Go to X-Utility > Expressions > Expression:
> type: "dummytime=time-time".
> This will place zero at each point in the new "dummytime" channel.
> 3. Go to Utility > Make distance channel: In the dialogue box:
> For "Existing X channel: type "time"
> For "Existing Y channel: type "dummytime"
> For "Output distance channel: type "timediff"
>
> This would calculate the differences of each point in the time channel
> and place them in the timediff channel.
>
> Hope this helps, David!
>
> To: Tom Cutbertson of Geosoft: While we are brainstorming this subject,
> could we place this as a feed back to implement a GX (e.g. Make difference
> channel) in the up coming versions of the Oasis montaj? I am sure it would
> be just a minor modification to the existing "Make distance channel" GX.
>
>
> Nice weekend everyone,
> mansour
>
> _______________________________________________________
> More mailing list info http://www.geosoft.com/support/listserv/index.html
> _______________________________________________________
> More mailing list info http://www.geosoft.com/support/listserv/index.html
_______________________________________________________
More mailing list info http://www.geosoft.com/support/listserv/index.html
