Topic:
How to load repeated shotpoints for a crooked 2D line.

Description:
Shotpoints are  808 808 808 807 807 806 806 806 ...with up to 5 repeats and
decreasing values in the segy trace header.

Solution:
Need to define an expression to calcualte the SP to load the line.

In Load Seismic > Define input format > Set header locations for SP to
expression. Select Shot point/CDP expressions and enter:

s1 = 1.0 increment = 1.0

cdp=cdp;if(s1.eq.1);then;fa=10000;endif;display(cdp,sp,fa)

sp=sp;if(sp.ge.fa);then;sp=fa-(1.0/5.0);endif;fa=sp

Then reset header location for SP back to Trace header and specify the start
byte and format for SP's.

What is loaded:
808 807.8 807.6 807 806.8 806 805.8 805.6 .......




Last Modified on: 05-JUN-00