Questions about Underwater Depth Sounders

[Kelly Jessop]

A survey grade here is not dependent on the accuracy of the LRUDs, survey grade only has to do with the lineplot survey.

I look forward to the day when we have sonar devices that will help us collect 3D information, until then the depth finders are a good tool for collecting basic information. They're pretty pricey though for the limited information you get from them.

I think to get the class C designation you need a detailed measurement at the survey station versus class B which is estimated. Generally people I know that have surveyed to Class C will pull tape.

[jlillest]

I think to get the class C designation you need a detailed measurement at the survey station versus class B which is estimated. Generally people I know that have surveyed to Class C will pull tape.

https://en.wikipedia.org/wiki/Cave_survey - See the accuracy section.

The gradings are somewhat vague and open to interpretation. I personally don't see much difference between the B and C subgrades and I'll leave a full discussion to the survey nerds over swill and arm-waving at the campfire.

I personally think that the real power of maps comes when you add good quality sketch or 3D components to a living dataset.

[rchrds]

I highly recommend everyone get with the UIS survey grade program. At this time, this is the only group which is actively updating and managing updates to survey technology with regards to survey grades.

http://www.uisic.uis-speleo.org/wgsurmap.html#grades


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[Kelly Jessop]

https://en.wikipedia.org/wiki/Cave_survey - See the accuracy section.

The gradings are somewhat vague and open to interpretation. I personally don't see much difference between the B and C subgrades and I'll leave a full discussion to the survey nerds over swill and arm-waving at the campfire.

I personally think that the real power of maps comes when you add good quality sketch or 3D components to a living dataset.

I understand what you are saying and agree. In cave diving a general consensus has been that a B grade is when someone is at the survey station and estimates the side wall from the line versus the C, which someone has pulled tape and made contact with the sidewall. I know a handful of cave maps that have the 3C designation, and know that tape was pulled for sidewalls.