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Messages - uniquorn

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1
Developers Corner / Re: Test space
« on: Today at 12:01:16 AM »
delaunay test showing 35 iabp mosaic buoys, naybe some are in similar locations. That will show up with labelling. This only shows 0mins, not the 30m. Quite a few dropouts. Will have to think about how to handle those.
added mp4 which includes the recent distortion.

2
Arctic sea ice / Re: MOSAiC news
« on: October 20, 2019, 10:32:50 PM »
Fortunately the sailwx shipdump is in decimal degrees or I'd have to run that ani again.
https://www.sailwx.info/shiptrack/shipdump.phtml?call=DBLK

They've also reserved 6 decimal places but PS only uses 1 ;)
"UTC date/time","Unix UTC timestamp","lat","lon","callsign",
"2019-Oct-20 1900", 1571598000, 85.000000, 132.800000, DBLK,

Quote
The difference between N 85°00' and N 85°01' is 1/60 of 111111 m or 1850 m. The difference between E 132°42' and E 132°43' (at 85º.00') is (haversine) 161.5 m but at 84º it is 193.7 m.
Perhaps the deformation presentation would be better shown in km.

added a crop of the mosaic no overlay map, oct11-19. click to run.

3
Arctic sea ice / Re: MOSAiC news
« on: October 20, 2019, 08:17:02 PM »
First amateur attempts towards a presentation of ice deformation. Here showing 3 mosaic buoys, chosen for their roughly equilateral relative positions using iabp coordinates to 4decimal place and Polarstern rough location to only 1dp, from day 281-291(earlier today). Polarstern coords are hourly and have been duplicated to match the 30m buoy coords.
300234068222000, Meeris Pbuoy
300234068225020 listed on iabp as IT (Ice tracker)
300234068226020, Meeris Pbuoy

Deformation is most noticable during day 286-7.
Distances shown are calculated using octave mapping which appears to produce results lower than that of the haversine method possibly due to the high latitudes. Will look into fixing that.
I haven't yet found PS location to more than 1dp

4
Developers Corner / Re: Test space
« on: October 20, 2019, 06:05:13 PM »
Deformation test, distances calculated using octave mapping are lower than haversine. I'm not sure what method it uses. removed

5
Developers Corner / Re: Test space
« on: October 20, 2019, 12:55:23 PM »
testing mosaic sbuoys with fade -up to oct20, still no labels

6
Developers Corner / Re: Test space
« on: October 19, 2019, 08:03:19 PM »
Sbuoy distance test. Definitely losing quality on these gifs
hmmm - 600px × 450px (scaled to 580px × 435px)
reposted at 580px wide is better

7
Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: October 18, 2019, 10:57:00 PM »
whoi-itp103 unsure where to go again at the mouth of the amundsen gulf. Another temperature spike at 6 and 7m, salinity also higher this time with less melt above.
https://www.whoi.edu/page.do?pid=163356

8
Arctic sea ice / Re: MOSAiC news
« on: October 18, 2019, 09:54:16 PM »
Back to the buoys. Here are the drift/delivery paths of 64 iabp buoys near the Mosaic area. There are 3 more, I think, with short identifiers and a slightly different format, not shown. Some have occasional -ve entries. At some point the id number should be related to buoy type.
Current list is attached as txt file.
added meerisportal list.

9
Arctic sea ice / Re: MOSAiC news
« on: October 18, 2019, 03:47:49 PM »
Today's polarview jp2->png, inverted. PS still moored. Default size showing surrounding area leads and 300% with standard unsharp mask.
Interesting that the leads are largely east/west

Where did the terrasar image come from?
https://earth.esa.int/web/eoportal/satellite-missions/t/terrasar-x

edit: added a guestimate overlay of fortress image above. Those leads look quite imposing.

10
Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: October 18, 2019, 01:01:03 AM »
mercator 0m salinity overlaid with uni-hamburg amsr2-uhh concentration at 60% transparent. 0% concentration, normally dark blue, has been set to fully transparent. sep17-oct16. click to run.

11
Arctic sea ice / Re: MOSAiC news
« on: October 17, 2019, 09:00:43 PM »
Thanks also to macid for the original coding. I am just script oldie.
edit: changed animation, temperature at 100m was more interesting. I wonder what is going on down there?
All 36 meerisportal buoys, for the record. Click to run.

12
Arctic sea ice / Re: MOSAiC news
« on: October 17, 2019, 07:13:57 PM »
 Looks like it.
Here showing the Sbuoys drift and air temperature. Will have to work out how to show 'distance to surface' 1-4 later.
Anomalous movement on the last buoy at the end. Have to work out labelling also.

13
Arctic sea ice / Re: MOSAiC news
« on: October 17, 2019, 04:50:58 PM »
A quick overview of mosaic Pbuoy drift before moving on to others.

14
Arctic sea ice / Re: MOSAiC news
« on: October 17, 2019, 12:49:15 AM »
Plenty to do tomorrow then. Updated my previous post using gimp 2.10.12. Will look through polarview images to see if any have better definition. Here is 400% scale of image above in gimp, saved to png -> imageJ, further linear contrast, adaptive contrast then unsharp mask. It retains a few more features than the standard jpg.

http://iabp.apl.washington.edu/WebData/  is easier access to iabp .dat files using the 15 digit id.

15
Arctic sea ice / Re: MOSAiC news
« on: October 16, 2019, 07:42:23 PM »
Today's polarview image, this time showing the jpg with graticule (no contrast change),
The longitude lines are 132 and 128E
Maybe too much movement from yesterday in the 3rd reflection for a tethered object.
edit: obviously it was AF that moved, see gif below, click to run, click all images for full resolution.
more edit:
 jp2 saved as png with linear contrast and a smaller crop jp2@200% bicubic>png  (honester ;) ).
struggled a bit with the gimp contrast but this should be linear

16
Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: October 16, 2019, 12:00:31 PM »
mercator 0m temperature overlaid with uni-hamburg amsr2-uhh concentration. 0% concentration, normally dark blue, has been set to fully transparent. sep16-oct15. click to run.

17
Arctic sea ice / Re: MOSAiC news
« on: October 15, 2019, 09:53:07 PM »
An update on the meerisportal buoys on macid's post upthread, tinkering with the code a little enables us to zoom in on the 12 buoys closest to the polarstern location. Still not sure which is the most flexible buoy analysis tool.

polarstern temperatures from sailwx

a crop of today's polarview jp2, linear contrast. 2 very bright radar reflections to the rhs. A new part of the mosaic installation?

18
Arctic sea ice / Re: MOSAiC news
« on: October 11, 2019, 08:06:40 PM »
Good step forward on buoy analysis :).
polarstern temps for niall, half a yoyo

19
Developers Corner / Re: Test space
« on: October 11, 2019, 07:18:53 PM »
:) fix is good

20
Arctic sea ice / Re: The 2019/2020 freezing season
« on: October 11, 2019, 03:42:57 PM »
Given the current SST's it's almost inevitable now that 2019 amsr2-uhh CAB extent will cross the 2012 line(orange), will it cross 2018??(brown)
wipneus CAB regional extent, oct10 https://sites.google.com/site/arcticseaicegraphs/regional

21
Developers Corner / Re: Test space
« on: October 10, 2019, 11:19:30 PM »
I think I have an environment problem (haven't we all?)
object 'rbind.fill' not found
my R installation has been a bit haphazard on win10
dplyr      0.8.3 is installed
will look at it tomorrow

22
Developers Corner / Re: Test space
« on: October 10, 2019, 10:23:35 PM »
I think you just got yourself volunteered :) though maybe I can help with the animations

23
Arctic sea ice / Re: MOSAiC news
« on: October 10, 2019, 10:12:16 PM »
A brief break in the clouds. Worldview, mosaic rough location, 84.9N 135.7 (no timestamp on worldview) https://go.nasa.gov/3286OQU

24
Arctic sea ice / Re: MOSAiC news
« on: October 10, 2019, 09:20:19 PM »
Thanks to meerisportal and the mosaic team, here are their prepared buoy charts.
Quote
Grosfeld, K.; Treffeisen, R.; Asseng, J.; Bartsch, A.; Bräuer, B.; Fritzsch, B.; Gerdes, R.; Hendricks, S.; Hiller, W.; Heygster, G.; Krumpen, T.; Lemke, P.; Melsheimer, C.; Nicolaus, M.; Ricker, R. and Weigelt, M. (2016), Online sea-ice knowledge and data platform <www.meereisportal.de>, Polarforschung, Bremerhaven, Alfred Wegener Institute for Polar and Marine Research & German Society of Polar Research, 85 (2), 143-155, doi:10.2312/polfor.2016.011.
Now to set them all up from the same start date/time and see where they all are :)
https://data.meereisportal.de/gallery/index_new.php?active-tab1=method&buoytype=all&region=all&buoystate=all&expedition=MOSAiC&submit3=display&lang=en_US&active-tab2=buoy
(english version)
seem to have lost the buoy names somewhere....fixed

25
Arctic sea ice / Re: MOSAiC news
« on: October 10, 2019, 08:40:25 PM »
Nice detective work. Don't we need to see the overall buoy set up before launching into continuum mechanics? edit: not that I know how to do that ;)
Based on today's multisensor map I think I've located a buoy on or very close to Polarstern for the last few days. iabp 300234068213470. I'm not sure if this is value for MB but here is it's drift track since records started.
GFS forecast (from Nullschool) shows a yo-yo swing in temperature in the vicinity of Polarstern over the next 24 hours or so.

By 12 UTC on 8th Oct, a plume of mild arrives up from Svalbard, yielding temperatures slightly above 0 C but it is short lived and 12 hours later at 00 UTC on 9th Oct, it forecasts temperatures below -10 C as cold air is advected across the Pole from the American side towards Russia.
warmest temp was -2.4C, still quite warm. Of course, it might be sitting in the hold somewhere so the temps might not be relevant. The drift should be valid though.
edit: tech note: gif is optimised to reduce size in gimp, it may be necessary to deoptimise if downloaded. OT they must be an amusing bunch at iabp

26
Arctic sea ice / Re: The 2019/2020 freezing season
« on: October 10, 2019, 11:42:50 AM »
Could be that Lorenzo's waves took a toll on the Atlantic Ocean side, especially around Svalbard?
Strange to see such a drop on October.
I think the continual export into FJL and Svalbard area over the summer was more unusual. Ice along the atlantic edge has been weakened or melted by sitting over a warm current all that time. Now the drift has temporarily? changed direction it offers little resistance. Yes, it's strange that this has come so late.
unihamburg amsr2-uhh, atlantic side, oct3-9
edit: looking at the forecast, export should resume shortly.

27
Arctic sea ice / Re: MOSAiC news
« on: October 10, 2019, 12:30:10 AM »
crop of the mosaic multisensor map, oct7-8 showing ~20km south eastward drift since yesterday. An interesting start to this expedition. Red and white bar at the top is 20km

28
Developers Corner / Re: Test space
« on: October 09, 2019, 07:37:49 PM »
I would definitely go higher, maybe 5C

Now to add temp/ salinity label to hover as well as depth. That might be easier than 2 bars

29
Developers Corner / Re: Test space
« on: October 09, 2019, 06:03:08 PM »
Quote
I made the bathy work on ITP 116
Tried this in ms edge which seems fastest to load. It works well, though the movement jerks a bit. Similar performance with chrome.

Thanks for the tip on salinity. There were quite a few more references to tempC but easy to find once I got the idea. Names instead of numbers...novel ;)

Why not tempC>2?

30
The forum / Re: odd bug or feature on relogin
« on: October 09, 2019, 04:57:38 PM »
maybe neven could try deleting post62?? The date order might be messing up the count.

31
Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: October 09, 2019, 03:38:44 PM »
Large format mp4, amsr2-uhh over gmrt bathy, sep1-oct8. Pls download as I'll remove it within 48hrs (it's a bit large) -removed

32
Arctic sea ice / Re: MOSAiC news
« on: October 09, 2019, 02:23:18 PM »
Thinking about the persistent dip in the ice edge in the Laptev, here is amsr2-uhh, mosaic startup area overlaid onto gmrt bathymetry at 60% transparent, sep1-oct8
edit: moved the focus further south
https://www.gmrt.org/GMRTMapTool/np/

33
Arctic sea ice / Re: The 2019/2020 freezing season
« on: October 09, 2019, 02:12:21 PM »
There's still a bit of melt and compaction on the atlantic side

34
Developers Corner / Re: Test space
« on: October 09, 2019, 01:21:20 PM »
Good progress. I got stuck attempting to change the temperature bar to salinity but my R plotly knowledge is zero. I couldn't see how to change the variable. :( Is it possible to show temp and salinity on the same scene?
I'm also wondering about using your 2d version for the mosaic iatb buoys http://iabp.apl.washington.edu/maps_daily_table.html though manual download is a bit laborious.

35
Arctic sea ice / Re: The caa-greenland mega crack
« on: October 09, 2019, 01:06:57 PM »
Today's worldview viirs brightness temperature, band15, night with yesterday's amsr2-uhh inset.
https://go.nasa.gov/2MvVvvg
click for full resolution

36
Arctic sea ice / Re: MOSAiC news
« on: October 08, 2019, 10:39:47 PM »
Well fed bears :)
Following on from A-team's post, polarstern is also slowly drifting south at the moment which doesn't help their situation. Here is polarview's latest jp2 combined with the jpg which has the graticule overlay. Akademik Fedorov is brighter today further north. (click for full resolution)

The animation below is ice tracker buoy 300234068129990 showing the last 2 days drift roughly 2 degrees west of mosaic. North is up, west is left (does my head in). Temperatures aren't provided on the IT buoy.

37
Greenland and Arctic Circle / Re: The Nares Strait thread
« on: October 08, 2019, 05:32:19 PM »
Clear enough weather over lincoln sea and part of ellesmere to take a look on worldview, viirsbt15n, sep oct6-8  https://go.nasa.gov/2odfrv3

38
Arctic sea ice / Re: MOSAiC news
« on: October 08, 2019, 01:13:50 PM »
Excellent! Today's mosiaic multisensor map zooms in on the selected floe :) (click for full resolution)
Here is an updated overview of mosaic buoy locations/movement up to oct7, 81-87N 114-140E

39
A nice summary. Is there an archive for polar cap height somewhere?

40
Greenland and Arctic Circle / Re: The Nares Strait thread
« on: October 08, 2019, 12:02:11 AM »
Thanks for the 'on the ground' image GAWLab. amsr2-uhh doesn't look quite the same :)
edit: added today's image (for yesterday) to the animation with the open water showing very clearly. Thanks for the 'heads up'.
oct1-7.

41
Arctic sea ice / Re: The 2019/2020 freezing season
« on: October 07, 2019, 09:22:07 PM »
Regardless of the minimum, CAB extent is edging towards the slow refreeze of 2018 (brown), 2012 is orange.
Wipneus amsr2 regional extent, oct6

42
Developers Corner / Re: Test space
« on: October 07, 2019, 08:43:43 PM »
itp116 10-50m. Code works in Rstudio out of the box (after installing plotly properly)

43
Arctic sea ice / Re: MOSAiC news
« on: October 07, 2019, 04:17:41 PM »

44
Developers Corner / Re: Test space
« on: October 07, 2019, 11:42:13 AM »
Reposting here so the library doesn't get clogged up
In the spirit of sharing I stole the genius of the best libraries around.. plotly does more than I could have dreamed of and exports to WebGL, takes some time to load but worth it :D

Smallest example: http://rpubs.com/macid/ITP119_TempC
check the rest on http://rpubs.com/macid/, the biggest ones have crashed my browser on occasion, would like to hear how it works for other people. Could optimize with averaging some data points if needed or other 'd0h' moments.

code updated on https://github.com/macidR/arcticPlotting/blob/master/plotly.R much quicker and awesome
Nearly perfect apart from using 6/8 cpu's and 18GB of memory. Took a long time to load (my broadband is challenged) but hasn't crashed. Actually resource use is dropping now it's loaded. Shame it doesn't show temperature/salinity?? as the slider moves ;)
Tried loading 2 at once, cpu 80% 32GB RAM 2 disks  writing 100% for~2m eventuall rebooted, had a lot of other things running
trying with chrome
Quote
hmm doesn't sound like you're seeing what I see, only tested with chrome, less then GB mem use & 20 secs loading or so, data download should only be 10MB.

The controls are supposed to let you pan/zoom/orbit the thing

Sample of ITP116 attached (one of the nicest)
ok, good with chrome on itp116, trying again with firefox. yup, memory goes to max with firefox.
very stable with 2 running on chrome. itp113 ran lots of 0-200m profiles in between the 0-800m and this shows the 50-100m warm layer well. 3d pan, orbit and slider is smooth.
Thanks macid
edit: works well on microsoft edge too. I disabled all add-ons on firefox but it still hogs memory(tested on 2 PC's)

Anyone else up for testing?  http://rpubs.com/macid/ITP119_TempC
others here: http://rpubs.com/macid/

46
Developers Corner / Re: Dev library
« on: October 06, 2019, 11:56:01 PM »

47
Arctic sea ice / Re: MOSAiC news
« on: October 06, 2019, 08:12:27 PM »
I thought it was accurate buoy placement, but I think sailwx latitude chart resolution is struggling this far north. Probably not much value in posting further.
edit: apologies to the chart creator, the saliwx lat/lon data is only 1 decimal place.

Off the map for ecmwf windy also. ~50km windswesterlies forecast further south on tues.
edit:added the drift path for whoi itp116 close the the pole which is stubbornly refusing fram export at the moment. (grey arrows are the annual drift track)

48
Arctic sea ice / Re: MOSAiC news
« on: October 06, 2019, 06:18:28 PM »
The mosaic multisensor map is improving all the time, from large opaque pointer and path to semi transparent for both. :) sep28-0ct5 crop. Maybe it will go to higher resolution as the movement slows down.
I'm not able to match the buoy path above with PS movement so far. Maybe helicopter flying between boats?? I realise the buoy map needs to be inverted and flipped.

edit:added latest polarview sentinel1 jpeg with graticule, showing the position of both boats. Mosaic insert top left

49
Developers Corner / Re: Dev library
« on: October 06, 2019, 04:47:29 PM »
In the macid spirit of sharing. Here is the octave code for creating the images for the mosaic buoy ani here https://forum.arctic-sea-ice.net/index.php/topic,2906.msg232120.html#msg232120
(rem the first line of the buoy file or it won't open)

50
Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: October 06, 2019, 04:36:19 PM »
Very interested. That's very close to what I've been thinking of. Thanks.
edit - itp116 has a smaller footprint for testing rotation.

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