COG CONTROLLER
The aim of the Cog control program is to check how far the shots made by Vibro are made from the topography group marking at the end of the day and to confirm that this distance is within the regular limits. The file format used in the COG program is the COG file taken from Recorder. The program uses the COG files of two main recording systems, Sercel 428 XL and 508 XT. After selecting the data format, the dimension information of the project must be entered into the program.
After the COG file is uploaded, the "Upload COG File" button will turn BLUE color. COG graphic shows the distance of the shot made. In the "Quality Control" panel, you can see which shots are out of the limits by entering the distance specified for the project and pressing the "QC line" button. The arithmetic mean of the shots can be plotted by pressing the "Mean line" button.
The QC line is shown as RED and the mean line is shown as GREEN. The QC line is selected as 12.5 m in the example below.
All shots outside the limits can be saved by clicking the "Save COG Error" button.
When Cog Failure of (Selected File Name).cog file is examined;
Column 1 = Cog File Column Number - It is also the X-axis of the graphic
Column 2 = COG Distance - Distance between the source point (Topography marking) on the S file given to Recorder and the Vibro's shot
Column 3 = COG Code (The code indicating the cause of the error – identified in the Header)
Column 4 = Source Line Number
Column 5 = Source Number
MISSING COG FILE
In case of Transmission Error that may occur during shots between Vibro and Recorder, the shot where the error occurred cannot be written to the COG file, so COG file will be incomplete.
In case of missing COG file;
- In the S (source) file, the X, Y coordinate and altitude information of the shot where the error occurred will not be taken from the Vibro GPS values, but from the topography information defined before the shots to the system.
-Shots with this problem should be determined and the coordinate information of these shots should be corrected while preparing the Final SPS file.
The number of Missing COG errors in the COG program is displayed on the "Missing COG" panel after the S file of that day is uploaded.
When the above example is interpreted;
During the shooting, a COG error occurred in 2 shots and wrong X, Y coordinate, and altitude information were entered in the S file for these two firing points. The coordinate and altitude information of these two points should be corrected while preparing the Final SPS file.
GeoTECH - Free Seismic Data Acquisition Quality Control Program