topcon2 topf seg2f lid shdp is nch vpl vpn ir esh isa isv ira ita topf = topcon file name seg2f = seg-2 file name lid = line ID shdp = shot depth is = shot location number nch = number of channels (nch<66) vp1 = geophone station channel 1 vpn = geophone station channel n ir = shot record number esh = elevation adjustment to be added isa = source polarization azimuth (deg.) isv = source polarization vertical (deg.) ira = reference phone polarization R-axis (deg.) ita = reference phone polarization T-axis (deg.)An example of issuing the command for a down-hole surve:
topcon2 stp001.nez 1051.DAT 00X5 0.0 1 6 0156 0151 1051 0. 270 135 0 270
This combines survey file stp001.nez with SEG-2 data 1051.DAT. In the case of down-hole data, the only orientation of horizontal components is known for the reference phone. To determine the orientation of a down-hole phone see GENBHOD 10.1.9 and BHOD 10.1.11. A partial listing of the resulting header dump by program BDUMP 4.0.1 follows:
|-------------------------------| | PARTIAL SEGY HEADER DUMP | | | | 1051.seg | | | |-------------------------------| ----------------------------------------------------------------------------------- Length = 2000 samples | Shot Elevation = 849.2 Sample Interval = 0.00025 sec. | Shot Depth = 0.0 Delay Time = 0 msec. | Up Hole Time = 0 msec Low Cut Filter = 0 Hz. | Shot X-COORD = 9963.09 High Cut Filter = 1000 Hz. | Shot Y-COORD = 10022.70 Line ID: 00X5 | Shot Date (year.moday) = 1999.1102 Shot Orientation: | Shot Time (hr:min) = 14:25 Azimuth=270 Deg. Vertical=135 Deg.| Charge Size (grams)= 0 ----------------------------------------------------------------------------------- TRACE|SHOT| STATION | OFFSET| RECEIVER |VERT|1STBRK|K-GAIN|AZI|VER| # |REC.|SHOT REC| | ELEV. X-COORD Y-COORD|FOLD|(SEC.)| (dB) | | | -----|----|---------|-------|----------------------------|--|------|------|---|---| 1 | 0|0001 0156| 0.73| 848.96 9963.09 10022.00| 3|0.0000| 0 |270| 90| 2 | 0|0001 0155| 0.73| 848.96 9963.09 10022.00| 3|0.0000| 0 | 0| 90| 3 | 0|0001 0154| 0.73| 848.96 9963.09 10022.00| 3|0.0000| 24 | 0| 0| 4 | 0|0001 0153| 14.49| 834.68 9963.09 10023.25| 3|0.0000| 24 | 0| 90| 5 | 0|0001 0152| 14.49| 834.68 9963.09 10023.25| 3|0.0000| 24 | 0| 90| 6 | 0|0001 0151| 14.49| 834.68 9963.09 10023.25| 3|0.0000| 24 | 0| 0|