by chac » Mar 5, 2013 1:56 pm
There are two ways to do this in Compass. Work with a copy of the original DAT file in case a mistake is made while editing. Probably the easiest way is to move the surveys around and delete or use the Exclusion flags on the rest of the surveys. Open the DAT copy, select "Edit" and then "Manipulate Surveys". A window will appear, we will work in the left pane.
Using the folder icon, select the DAT file copy (not the original), all the DAT Copy surveys will appear in that pane. Highlight each survey and use the arrows to the left to move the two surveys up to the top of the file order in this pane. As you are surveying into the cave, the first survey should be the first inbound survey, the second survey will be the survey that branches from it. Once done, delete all the rest of the surveys, now save.
[If you need those survey files later, keep them.
Open the DAT copy, note the surveys are now moved. Open the subsequent surveys you don't want to plot in the survey editor, add the "X" Exclusion flag for all the shots, save, repeat for all the rest of the unwanted surveys.]
You are done, Process and plot. If accurate station depth is important (usually is in any case), process your original DAT file (not the DAT copy you just worked on), check the depth of the first station of the first survey that is in the DAT copy. Write it down, close the original DAT file, Now open the DAT copy file, then open the first survey in the editor. Add a station before the first station. Make sure this station will tie into the rest of the station progression. For the "fake station" data, use the numeral "0" for the AZM. Length will be the exact depth of the station you wrote down earlier, INC will be -90. No need for LRUD's. Save, process, the DAT copy will show correct depths when you process this DAT copy file.
It sounds complicated, it really isn't. If you do this once, the next time you will have it done in less than a minute. PM me if you run into problems.
Jim
Jim Coke