David,
take the 1st. difference of the of the time records and divide it into the
corresponding distances (distance/time = speed).
Nick Gant,
Coordinator, G&M.
Chevron Overseas Pet. Inc.,
San Ramon, CA.
Ph: (925) 842 3691, FAX (925) 824 0062.
e-mail: [EMAIL PROTECTED]
> -----Original Message-----
> From: David Humphrey [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, July 15, 1999 12:42 PM
> To: '[EMAIL PROTECTED]'
> Subject: [geonet]: Calculating speed from (x,y,t) points
>
> I have a database containing (x,y) coordinates and time for each point. I
> want to calculate speed s at each point according to the formula:
>
> S2 = (d2-d1)/(t2-t1)
>
> Where d1 and d2 are the distance along the line for successive points. I
> see a GX that does the distance calculation, but don't see how to get the
> time difference. The problem is using values from different records in a
> .gdb.
>
> I know I can write a GX that does this, but would like to use existing
> Oasis
> montaj machinery, if possible. Does anyone know a better way?
>
> Thanks in advance.
>
> David L. Humphrey
> Manager, Software Development
> Bell Geospace, Inc
>
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