Just want to check on the recommended way to manage survey accuracy within Therion.

I have a hierarchal dataset with a three cave system, set up with index and configuration files so that I can compile any individual or combination of the caves.  I’m about to expand the dataset to accommodate perhaps a dozen caves, and many more minor holes / karst features.  Likewise they will need to be compiled individually or in sets.  To date I have not included ‘grade’ or ‘sd’ statements in my survey.th files, except for ‘sd’ statements where I know the survey quality is really poor.

Recently I have put together a single top level grades.th file, and referenced this in my top level index files only.

I assume that the ‘correct’ way is to apply a grade statement(and infer plumbs on/off) in each and every low level survey-endsurvey block.

Instead, I have cheated perhaps, by adding a grade statement (and infer plumbs on) to AllThreeCavesSystemINDEX.th.  If I then add a grade statement in one of the sub-surveys, am I potentially changing the grade applied by Therion to the whole cave system?

I’m not sure, but I seem to be getting odd results, in that the corrections applied to different parts of loops do not seem to respond to changes as I expect.  I’m not sure of the scope implied by the last sentence in this extract from the Therion Book.

"

grade <grade list> . Sets standard deviations according to the survey grade specification (see grade command). All previously specified standard deviations or grades are lost. If you want to change an SD, use the sd option after this command. If multiple grades are specified, only the last one applies.

"

Any suggestions on where I should be putting grade statements?

Bruce