raptop changed the topic of #kspacademia to: https://gist.github.com/pdn4kd/164b9b85435d87afbec0c3a7e69d3e6d | Dogs are cats. Spiders are cat interferometers. | Космизм сегодня! | Document well, for tomorrow you may get mauled by a ネコバス. | <UmbralRaptor> egg|nomz|egg: generally if your eyes are dewing over, that's not the weather. | <ferram4> I shall beat my problems to death with an engineer. | We can haz pdf
<egg|laptop|egg>
if i poke GNSS orbits with a stick, do i need to issue NANUs/NAGUs,
<mofh>
okay this is, like, yelling at mailing list levels of badness
<oeuf>
calm down, we need to clean up the diff for that
<oeuf>
because that's ultimately fine, the data is replicated
<oeuf>
perhaps in timezone-compensated gps weeks but that's not missing data
<oeuf>
there does seem to be actual missing data though
<oeuf>
well, unreplicated
<oeuf>
we can't find actual missing data from diffs,
<oeuf>
CDDIS seems to systematically be missing WHU data from some point on (or possibly all the time, dunno if there's any early on that's correctly replicated)
<mofh>
Yeah, that's weird tho since isn't as you said CDDIS is the master server?
<oeuf>
"master"
<oeuf>
"Orbit and clock products that become available as part of the MGEX data analysis are made available at the CDDIS MGEX product archive as well as mirror sites hosted by IGN and ENSG."
<oeuf>
they say that
<oeuf>
I suspect they all independently upload to all three
<oeuf>
or forget about some
<egg|laptop|egg>
e.g. there are TUM batches that are missing from IGN
<egg|laptop|egg>
way less < than > on the whole in your diff
<mofh>
Yeah this is very confusing
<egg|laptop|egg>
mofh: mind you, there's the EX in MGEX, so I would expect the number of people involved (and care given to replication etc. proportionally) to be smol
<egg|laptop|egg>
mofh: I would hope that the main IGS repositories would be saner
<egg|laptop|egg>
[famous last words]
<mofh>
EX?
<egg|laptop|egg>
MGEX?
<galois>
MGEX: Multi-GNSS EXperiment
<egg|laptop|egg>
mofh: afaict the glonass directory of CDDIS is IGEX/IGLOS-PP, and that's not replicated at all presumably for the same reason
<egg|laptop|egg>
IGEX?
<galois>
IGEX: International ГЛОНАСС EXperiment
<egg|laptop|egg>
IGLOSS-PP?
<egg|laptop|egg>
IGLOSS?
<egg|laptop|egg>
hm
<egg|laptop|egg>
IGLOS-PP?
<galois>
IGLOS-PP: IGLOS Pilot Project
<egg|laptop|egg>
yay
<mofh>
Ahh.
<egg|laptop|egg>
IGLOS?
<galois>
IGLOS: International ГЛОНАСС Service
<egg|laptop|egg>
IGS?
<galois>
IGS: International GNSS Service
<egg|laptop|egg>
GNSS?
<galois>
GNSS: Global Navigation Satellite System
<egg|laptop|egg>
ГЛОНАСС?
<galois>
ГЛОНАСС: ГЛОбальная Навигационная Спутниковая Система
* egg|laptop|egg
stares at the acronym expansions for GPS, GNSS, and ГЛОНАСС
<egg|laptop|egg>
well,
<egg|laptop|egg>
especially the latter two
<egg|laptop|egg>
mofh: clearly since ГЛОНАСС just means the same thing as GNSS the IGS is the same thing as the IGLOS,
<kmath>
<halvorz> 10thyearphdgoogling: how to get doi for tweet
<SnoopJeDi>
meirl
<egg|laptop|egg>
mofh: look everybody keeps saying GPS when everything at least supports глонасс now, so clearly we should just call everything глонасс, it's more generic,
<egg|laptop|egg>
mofh: also while we're galaxybraining, considering that the experimental (regional) project was 北斗一号 and then the current global one is 北斗二号, is this one country, two GNSSes,
<mofh>
...ROFL
<mofh>
I mean sure, why not,
<egg|laptop|egg>
mofh: tbh the US did Transit and SU did Циклон, so this is a common pattern
* egg|laptop|egg
screams incoherently at the residuals
<egg|laptop|egg>
mofh: "Ferraris are built to minimize non-gravitational forces, trucks not really (only “to some extent”). From the p.o.v. of orbitography the Lageos is a Ferrari, the GNSS satellite is a truck"
<egg|laptop|egg>
those slides are fun
<mofh>
ROFL
<egg|laptop|egg>
mofh: "The article was only written, because Leos Mervart wanted Beutler to learn LaTex. In this respect, the article was a success. E-Mail by Leos Mervart commenting this slide: Remember not the sins of my youth or my transgressions (Psalm 25:7)"
<egg|laptop|egg>
mofh: gaaaaah i am getting residuals wrt the SP3 orbits on the order of 0.1 mm/s over 5 min, which is way too much
<egg|laptop|egg>
(point-to-point evolution, comparing the evolved velocity with what I derive from the SP3 file or what is given in it)
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<egg|laptop|egg>
mofh: compare table 3.2 in part A, section 3.2 of the Springer Handbook of Global Navigation Satellite Systems, that's about the order of magnitude of the geopotential coefficients beyond J2, except i'm supposed to have those
<mofh>
egg|laptop|egg: yeah that seems a bit high?
<egg|laptop|egg>
(yes i am swimming in GNSS and geodesy literature why do you ask)
<egg|laptop|egg>
mofh: how's ENSG
<egg|laptop|egg>
mofh: also when you are done you should do all of IGS (different set of mirrors though), then IDS and ILRS :-p
<egg|laptop|egg>
including ESA and UCSD that you have yet to poke at, and something that says both ENSG and IGN in the same URL :-p
<egg|laptop|egg>
GSSC?
<galois>
GSSC: GNSS Science Support Centre
<mofh>
oh grate, that last one of those inspires a lot of, erm, ""confidence""
<egg|laptop|egg>
:D
<mofh>
(I wonder if that mirror also runs on an Apple ][?)
<egg|laptop|egg>
mofh: actually that one ALSO has an MGEX directory, even though they don't talk about it ftp://igs.ensg.ign.fr/pub/igs/products/mgex/
<egg|laptop|egg>
neither ESA GSSC nor UCSD LOX seem to have MGEX
<egg|laptop|egg>
LOX?
<egg|laptop|egg>
hm
<egg|laptop|egg>
no idea what it stands for
<mofh>
I assume not Liquid OXygen
<SnoopJeDi>
or smoked salmon
<mofh>
which is what my brain instantly pattern-matches that as (and reflexively reacts with "keep it away plz")
<SnoopJeDi>
I volunteer as tribute
* egg|laptop|egg
pets mofh via FTP
<mofh>
SnoopJeDi: "accidentally condensed some oxygen" is a pretty bad failure case if you don't account for it when dealing with cryogens.
<mofh>
(suddenly reminded again of that exchange: me: "wait, why are you here, I thought you had a series of reactions that took all day?" them: "so I glanced at my Schlenk line and it's pale blue." me: "...good call.")
<mofh>
(bonus points for the solvent in question being cold-trapped being THF)
<SnoopJeDi>
this reminds me how little I know about cryo
<mofh>
(ultimately it was warmed and vented carefully and everything was fine, but I hope I never encounter "LOX in solvent cold trap" personally, ever).
<egg|laptop|egg>
mofh: halp my gnss satellites have weird residuals
<mofh>
egg|laptop|egg: yeah I'm not sure how you're getting residuals of the sort that I've seen plots of
<egg|laptop|egg>
the GEO ones seem to have a residual acceleration that's mostly pointing south, the IGSO one goes in a slightly southy circle, and the MEO are all over the place
<mofh>
okay how the hell do you get residual accelerations for a GEO orbit? that strikes me as fundamentally weird
<kmath>
<lianghai> MWG #3 (Unicode Mongolian Working Group Meeting 3) in Ulaanbaatar is done! I think we’ve made unprecedented progres… https://t.co/oRkQTtvWRb
<egg|work|egg>
mofh: you might want to forward it to zethar
<_whitenotifier-3d18>
[Principia] pleroy 2528393 - Merge branch 'Layout' into Compacter
<_whitenotifier-3d18>
[Principia] ... and 5 more commits.
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<oeuf>
mofh: meeeoooow
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* SnoopJeDi
pets oeuf
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<_whitenotifier-3d18>
[Principia] pleroy opened pull request #2133: Use the warning style if the initial time of a manoeuvre is too large - https://git.io/fjmkj
<egg|laptop|egg>
mofh: hm actually there's a third generation, e.g. 北斗三号-IGSO1-S
<egg|laptop|egg>
Huh "Le système géodésique de référence[19] de Beidou-l est Beijing-1954. [19]: 0n peut s'étonner de l'utilisation pour Beidou-1 d'un système de référence aussi ancien, et encore plus que son nom ne l'indique, puisqu'il est un calque du modèle soviétique Krasovsky-1940."
<egg|laptop|egg>
mofh: also how many mofhsecs are in a mofhmoment