Talk:Processing your ADCP data using structure function techniques
Jmmcmillan (talk) 21:50, 12 November 2021 (CET) Can we change the title of this page to be more specific? Like "Computing the structure functions and dissipation rates"
- Yuengdjern (talk) 16:42, 15 November 2021 (CET) It's pretty hard to change page names without actually just creating new ones. we can 'move' pages and then there'll be a redirect shown at the top of the page, because 'move' pretty much creates a new page. Will play around with that.
Jmmcmillan (talk) 21:54, 12 November 2021 (CET) I find the use of [math]\displaystyle{ D(n,\delta) }[/math] a little confusing. In reality, for each range bin and each time ensemble, D only depends on [math]\displaystyle{ \delta }[/math]. Can we drop the n for simplicity?
- Djwain (talk) 22:44, 14 November 2021 (CET)I agree here - we don't actually define n on this page, so it is confusing to have it in the definition of v' and D. I think I wrote this originally and was basing it on the way my code is written, but really mean something like D_n(delta) where n denotes which bin we are differencing around or from.
Djwain (talk) 22:51, 14 November 2021 (CET)I agree with Justine on the three ways of dealing with the data being somewhat confusing.- I am having a very hard time visualizing what is being explained in item 1 because I don't process my data this way. I think we probably need to be giving some guidance on why you might do a forward vs a center difference and maybe branch based on that. The forward difference example is really nice and helpful I think!
- Yuengdjern (talk) 16:42, 15 November 2021 (CET) Right this seems to where the potential for contention arises, given the conversation here and also on Teams. So I think for now we pick the most common and add an aside that there are alternatives. I've also moved this stuff to a new page to keep the step-by-step instruction page flowing.
Djwain (talk) 22:53, 14 November 2021 (CET)I also agree that step 7 should probably be in QA2
- Yuengdjern (talk) 16:31, 15 November 2021 (CET) moved Step 7 to top of QA2
Djwain (talk) 22:53, 14 November 2021 (CET)A schematic is definitely needed here - SF is much easier to visualize I think than read! I don't have any schematics that I have made (and thus own for distribution).
Yuengdjern (talk) 16:42, 15 November 2021 (CET) JMM's comment about referring to QA2. I think I second that. Dumping the cut text here in case we want it later, but adding a link to QA2. Pasted text:
Some things to consider are: [JMM: SHOULD WE INCLUDE THESE HERE, OR MAKE A LINK TO A PAGE ABOUT QUALITY CONTROL METRICS TO COMPUTE?]
- Including [math]\displaystyle{ D(n,\delta) }[/math] for [math]\displaystyle{ \delta=1 }[/math] may be inappropriate since the velocity estimates from adjacent bins are not wholly independent, therefore the impact of its inclusion should be evaluated
- Keep a record of the number of instances when the squared velocity difference is evaluated for each bin [math]\displaystyle{ n }[/math] and separation distance [math]\displaystyle{ \delta r_{0} }[/math] and their distribution because they are potential quality control metrics
- The impact of additional quality criteria can also be tested e.g. valid data requirements for all intermediate separation distances, so for a forward-difference scheme with [math]\displaystyle{ n=2 }[/math] and [math]\displaystyle{ \delta=5 }[/math], require all data in bins 2 to 7 to meet Level 1 QC requirements for the profile to be included when averaging to calculate [math]\displaystyle{ D(n,\delta) }[/math]
Yuengdjern (talk) 16:55, 15 November 2021 (CET) making a global change to the wiki page to change D to DLL because that's what our netcdf variable is.
- CynthiaBluteau (talk) 19:58, 22 November 2021 (CET) I added the diagram from overleaf here, but feel free to move elsewhere. The variables should be listed under the Nomenclature page.
