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b_lumenkraft

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The Rammb Slider Thread
« on: April 15, 2019, 07:04:36 AM »
As requested,

Perhaps you should start a new thread to store them.

, here i will post GIFs made with the Rammb Slider website which provides satellite images of the Arctic in 51-minute steps.

Hope you all enjoy. :)

b_lumenkraft

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Re: The Rammb Slider Thread
« Reply #1 on: April 15, 2019, 07:09:40 AM »
This is a GIF showing the Beaufort Sea.

You can see beautifully how the wind moves the ice, causing a spiral pattern.

Edit: The gyre below is also contributing to the movement.

(Click to play)
« Last Edit: April 15, 2019, 11:35:25 AM by b_lumenkraft »

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Re: The Rammb Slider Thread
« Reply #2 on: April 15, 2019, 07:17:51 AM »
This is a GIF showing a perfect storm over Nares Strait on 11. and 12. 04.

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Re: The Rammb Slider Thread
« Reply #3 on: April 15, 2019, 08:48:53 AM »
Amazing stuff, thank you B_L. Although the name of the thread may not be clear to some.

b_lumenkraft

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Re: The Rammb Slider Thread
« Reply #4 on: April 15, 2019, 09:16:47 AM »
Thanks a lot Oren :)

I thought it's a good nerdy name for nerdy sea ice topic. I'm not married to it though.

Neven, feel free to rename (if possible).

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Re: The Rammb Slider Thread
« Reply #5 on: April 15, 2019, 11:29:23 AM »
This is a GIF showing the Beaufort Sea.
You can see beautifully how the wind moves the ice, causing a spiral pattern.
Thanks for the new thread b_l. As you probably know, the gyre below is also contributing to the movement.

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Re: The Rammb Slider Thread
« Reply #6 on: April 15, 2019, 11:36:52 AM »
This is a GIF showing the Beaufort Sea.
You can see beautifully how the wind moves the ice, causing a spiral pattern.
Thanks for the new thread b_l. As you probably know, the gyre below is also contributing to the movement.

You are welcome Uniquorn.

Thanks for the correction. I've edited the post accordingly. :)

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Re: The Rammb Slider Thread
« Reply #7 on: April 15, 2019, 11:58:14 AM »
This is a GIF showing the Nares Strait downstream of Franklin Island.

There is evaporation going on directly after Franklin. I suspect swirls are causing upwelling here, showing the heat content carried by Nares deep waters.

Timeframe covered: 14.04. 11:16 to 20:35 UTC

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Re: The Rammb Slider Thread
« Reply #8 on: April 15, 2019, 12:52:23 PM »
b-lumencraft .. thanks for allowing the gifs to be played seperately ..I cannot load some pages here because all the gifs are trying to load and play themselves at the same time and my connection is not that good . I only wish all posters could adopt similar tactics .. for folks like me .. and for the environment .. b.c.
2007 + 5 = 2012 + 4 = 2016 + 3 = 2019 ...

b_lumenkraft

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Re: The Rammb Slider Thread
« Reply #9 on: April 15, 2019, 02:16:57 PM »
b-lumencraft .. thanks for allowing the gifs to be played seperately ..I cannot load some pages here because all the gifs are trying to load and play themselves at the same time and my connection is not that good . I only wish all posters could adopt similar tactics .. for folks like me .. and for the environment .. b.c.

Thank you B.C.,

but actually, i think it's the forum software doing this when GIF size is very big. I did nothing special.

Neven, can you shed light on this? Is there an 'play inline' option?

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Re: The Rammb Slider Thread
« Reply #10 on: April 15, 2019, 02:53:01 PM »
Yes, from a certain size onwards (700x700px or some such, I'm not sure) gifs only play by clicking on them.
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Re: The Rammb Slider Thread
« Reply #11 on: April 15, 2019, 03:03:36 PM »
Click is required above 700 pixels. Or make an MP4 instead of a gif.
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Re: The Rammb Slider Thread
« Reply #12 on: April 15, 2019, 03:05:27 PM »
Yes, from a certain size onwards (700x700px or some such, I'm not sure) gifs only play by clicking on them.

Thank you for your answer Neven. :)

So B.C., what do we do with this info? Upload big ones on purpose so they don't autoplay?

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Re: The Rammb Slider Thread
« Reply #13 on: April 15, 2019, 03:10:21 PM »
Click is required above 700 pixels. Or make an MP4 instead of a gif.

Thanks Sleepy,

MP4s don't play in the browser for me. I need to download them and play them with separate software. Very inconvenient IMHO.

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Re: The Rammb Slider Thread
« Reply #14 on: April 15, 2019, 03:15:02 PM »
Some MP4's do not play well, I made this one with handbrake recently, does it play for you?
https://forum.arctic-sea-ice.net/index.php/topic,1102.msg195011.html#msg195011
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Re: The Rammb Slider Thread
« Reply #15 on: April 15, 2019, 03:39:58 PM »
Sorry to report: No. :-[

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Re: The Rammb Slider Thread
« Reply #16 on: April 15, 2019, 03:59:24 PM »
Ok, just trying to figure out if it was playing for you, the settings I use in handbrake should work in most browsers, I primarily use Firefox myself.
But since MP4 is just a container it's possible to make it unplayable for everyone. ;)
http://camendesign.com/code/video_for_everybody/test.html

The easy fix is to make your gifs 701 pixels or more.
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uniquorn

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Re: The Rammb Slider Thread
« Reply #17 on: April 15, 2019, 08:08:31 PM »
I sympathise with be cause's problem not least because I am on satellite broadband and am always managing bandwidth at the end of the month. It should be noted that 700 pixel gifs (or less) often produce the best quality images when viewed directly in the browser.
I think posting larger animations on the less viewed threads is a good compromise, though I thought that neven preferred an upper limit of ~10MB. If be cause really wants to view those threads then there is always the option suggested a long time ago here.
https://forum.arctic-sea-ice.net/index.php/topic,1259.msg165467.html#msg165467

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Re: The Rammb Slider Thread
« Reply #18 on: April 15, 2019, 10:02:15 PM »
Larger files cost more energy. I'm neurotic when it comes to that kind of stuff. In the greater scheme of things, it doesn't matter all that much. But it does matter to some of those people who don't have limitless bandwidth at their disposal, so I try to keep files as small as possible.
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Re: The Rammb Slider Thread
« Reply #19 on: April 15, 2019, 10:38:27 PM »
Larger files cost more energy. I'm neurotic when it comes to that kind of stuff. In the greater scheme of things, it doesn't matter all that much. But it does matter to some of those people who don't have limitless bandwidth at their disposal, so I try to keep files as small as possible.
understood

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Re: The Rammb Slider Thread
« Reply #20 on: April 16, 2019, 07:33:39 AM »
Larger files cost more energy. I'm neurotic when it comes to that kind of stuff. In the greater scheme of things, it doesn't matter all that much. But it does matter to some of those people who don't have limitless bandwidth at their disposal, so I try to keep files as small as possible.
understood

I don't understand.

Let's imagine 2 threads. The first thread has only small GIFs. A person opening this thread would download all the GIFs just by opening the thread.
Another thread with only big GIFs would not download any GIF, but only the ones they are clicked on.

So the thread with bigger GIFs would need more memory on the server but would cause less traffic because threads are opened way more often than GIFs clicked on.

As unintuitive as it sounds, bigger GIFs would cause less traffic given the behaviour of the forum software.

Sleepy

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Re: The Rammb Slider Thread
« Reply #21 on: April 16, 2019, 10:27:19 AM »
People are talking different sizes here, pixel size and file size. Then add animation and canvas size.

If you want a thread primarily using animated images and at the same time optimize loading time for users with low bandwidth you should use a 701 pixel canvas. A 700 pixel image (or lower) with a 701 pixel canvas is exactly as good as an image with an 700 pixel canvas as long as the image itself is the same (original) size, pixelwise...

Your filesizes are also a bit large b_lumenkraft, as an example, NSDust03 above is +14MB, as a comparison I'll attach a modified animation using ScreenToGif and Photoshop with a 701 pixel wide canvas, it's now down to 3,7MB and it doesn't autoplay.

In short; b.c. is happy because loading time and power consumption are improved at his end.
Nevens servers likewise.
You've got more work and increased your own power consumption.
Like I did right now. But I save a lot more by not using a car. ;)

Edit; forgot to add the former standard phrase in here, click to animate.
« Last Edit: April 16, 2019, 10:55:05 AM by Sleepy »
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Re: The Rammb Slider Thread
« Reply #22 on: April 16, 2019, 11:09:12 AM »
I understand now. Thank you Sleepy, that was very helpful.

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Re: The Rammb Slider Thread
« Reply #23 on: April 16, 2019, 06:19:08 PM »
In the GIF below i provide visual context to this post from the Nares Strait thread:

Looking at pairs of DMI-Greenland Sentinel images that are "1 day" apart (but who knows the exact number hours between any two images?) - March 14 and March 15 - I see large floes coming into the north end of Nares Strait (that I'm 'sure' will break along the way, and not create an ice jam) having moved 30 km, floes moved 65 km in Hall Basin, 35 km in Kane Basin, and 55 km in Smith Sound.  (Named locations can be found in the very first link offered in the [Greenland and Arctic Circle folder] Google Maps with place names thread Reply #1 or more directly here.)  Averaging these rates, ice is currently taking about 10 days to traverse the 500 km length of Nares Strait.

14.04. 01:50 to 15.4. 10:38 (UTC)

Click to play
« Last Edit: April 16, 2019, 06:25:46 PM by b_lumenkraft »

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Re: The Rammb Slider Thread
« Reply #24 on: April 19, 2019, 07:19:04 PM »
This is a GIF showing 'spaghetti clouds' i spotted today.

For orientation, on the right, the Nares Strait.

Five frames, 18.04. 03:14, 04:56, 06:37, 12:33, 13:24 UTC

When someone can explain how they form i would be thankful for input. :)

(click to play)

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Re: The Rammb Slider Thread
« Reply #25 on: April 19, 2019, 07:59:02 PM »
flight path?

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Re: The Rammb Slider Thread
« Reply #26 on: April 19, 2019, 08:03:53 PM »
Good idea, Uniquorn.

Just googled it and apparently, planes do fly up there.

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Re: The Rammb Slider Thread
« Reply #27 on: April 19, 2019, 10:54:58 PM »
Looking for something about Amundsen Gulf tides found this journal from 1986.

International Hydrographie  Review,  Monaco,  LXIII (2),  July  1986CANADIAN  ARCTIC  TIDE  MEASUREMENTTECHNIQUES  AND  RESULTSby  B.J.  TAIT,  S.T.  GRANT,  D.  St.-JACQUES  and  F.  STEPHENSON (*)
https://journals.lib.unb.ca/index.php/ihr/article/viewFile/23426/27201

Quote
The  tide  in  the  southern  Beaufort  Sea  and  in  Amundsen  Gulf  propagates counterclockwise  about  an  amphidromic  point  situated near the  southwest  corner of  Banks  I.  It  propagates  quickly  along  the  coast  from  Alaska  to  a  point approximately midway along the Tuktoyaktuk Peninsula where it slows significantly,  reaching  Sachs  Harbour (site  4,  Figure  2)  on  Banks  I. about  six  hours  later.  In Amundsen  Gulf the  tide  travels  east  into  Dolphin  and  Union  Strait  and  Prince Albert  Sound  and  northwest  into  Prince  of Wales  Strait.The  tidal  propagation  patterns  in  the  waterways  between  the  eastern  end  of Amundsen Gulf and the southern end of M’Clintock Channel are complex and not yet  well  defined.  Further field  surveys  are  planned  for these  areas.

First image is fig2 from the journal.
Original rammb animation 35MB (80 frames) when cropped was 5MB and very small. Enlarged 2x took it to 18MB. Converting to mp4 gets 384kB. (click to play)
ffmpeg -i rb2.gif -pix_fmt yuv420p -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" rb2.mp4
Worldview terra modis apr18 (or nearest) 2010-2019posted on melting season (deleted here to help save the planet)
« Last Edit: April 20, 2019, 12:48:32 AM by uniquorn »

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Re: The Rammb Slider Thread
« Reply #28 on: April 19, 2019, 11:19:16 PM »
"Amundsen" that's timely I've been thinking the tides there are about to kick off opening up the coastal ice off Banks driving ice across to Alaska and firing up the gyre. Plus that format gives me the opportunity to loop and adjust speed.

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Re: The Rammb Slider Thread
« Reply #29 on: April 19, 2019, 11:29:40 PM »
Hoping that the slider might show evidence of the tides. Drift would appear to be largely wind driven once fractured at the moment but if the wind drops the tide may show itself.
edit: unfortunately I don't have the broadband vol to check the slider regularly (or width. gives me an idea for a new thread   ;)  Funny. Possible best format doesn't play for the OP)
« Last Edit: April 20, 2019, 12:38:45 AM by uniquorn »

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Re: The Rammb Slider Thread
« Reply #30 on: April 20, 2019, 06:40:25 AM »
Funny. Possible best format doesn't play for the OP)
Yeah, all major browsers support H.264 in MP4. Everything else is doable with ffmpeg, except coffee. :)
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Re: The Rammb Slider Thread
« Reply #31 on: April 21, 2019, 08:46:27 AM »
A final OT-comment since this was brought up here.
b_lumenkraft, I noticed the test bed thread yesterday and used uniquorn's MP4 there, added quicktime and iOS support using ffmpeg:
https://forum.arctic-sea-ice.net/index.php/topic,2558.msg196167.html#msg196167

The issue here is that it also makes the file slightly larger. Not too bad in that case but if I take a video (like the one I asked you to view in reply #14, made using handbrake) and provide universal support, it will increase in size from 3,19MB to 8,16MB. And that's a small video.
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Re: The Rammb Slider Thread
« Reply #32 on: April 21, 2019, 09:03:35 AM »
I was looking for a tool (for Mac) yesterday that can do screengrab and does support canvas size adjustment and can export as MP4 but didn't find anything suitable.

What are you using Sleeepy.

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Re: The Rammb Slider Thread
« Reply #33 on: April 21, 2019, 09:58:59 AM »
PC, the last time I used a MAC was some twenty years ago working as a systems manager, but that's also the reason for using Photoshop. GIMP should do just fine as a replacement but I've never used it myself.
For screengrabs I mainly use ScreenToGif, which is not available for MAC. There are alternatives for MAC there as well but I don't know anything about those.
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Re: The Rammb Slider Thread
« Reply #34 on: April 21, 2019, 12:10:51 PM »
Ah ok. Thank you anyway Sleepy.

Need to get familiar with Gimp then i guess.  ;)

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Re: The Rammb Slider Thread
« Reply #35 on: April 22, 2019, 08:53:13 AM »
In this GIF you see a closeup of the Nares Strait arch during high(er) tide conditions.

Transport in the strait stalls briefly, at the arch it reverses direction. The GIF showing 19.04. 7:59h to 22.04. 00:17h UTC.

Tidal chart attached. Click to play GIF

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Re: The Rammb Slider Thread
« Reply #36 on: April 22, 2019, 09:15:40 AM »
Hoping that the slider might show evidence of the tides.

I don't know Uniquorn, i don't see anything.

Click to play GIF

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Re: The Rammb Slider Thread
« Reply #37 on: April 22, 2019, 02:09:33 PM »
Hoping that the slider might show evidence of the tides.
I don't know Uniquorn, i don't see anything.
Thanks for looking b_l. Nothing obvious. The thinner ice with (hopefully) lighter winds may show something later.

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Re: The Rammb Slider Thread
« Reply #38 on: April 22, 2019, 02:30:27 PM »
Thanks for looking b_.

You are very welcome.

Though i'm having a lag of GIF tools there is no lag in bandwidth. I will keep it observed. :)

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Re: The Rammb Slider Thread
« Reply #39 on: April 22, 2019, 02:36:04 PM »
I was looking for a tool (for Mac) yesterday that can do screengrab and does support canvas size adjustment and can export as MP4 but didn't find anything suitable.

What are you using Sleeepy.

I use the Mac utility called 'Grab', I don't know if it will do all you need, works fine whenever I've used it.

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Re: The Rammb Slider Thread
« Reply #40 on: April 22, 2019, 04:20:50 PM »
That's weird, i don't have that Phil. It's not pre-installed for me and can't find it in the appstore.  :-\

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Re: The Rammb Slider Thread
« Reply #41 on: April 23, 2019, 12:50:35 PM »
Laptev sea April 18-23. Band M7.
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Re: The Rammb Slider Thread
« Reply #42 on: April 23, 2019, 08:18:32 PM »
Looks like it's headed towards the Nares after all! ;) ;D

I'm really enjoying the animations in this thread - great stuff.

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Re: The Rammb Slider Thread
« Reply #43 on: April 23, 2019, 08:26:30 PM »
Looks like it's headed towards the Nares after all! ;) ;D

It might melt before it get's there.  ???   ;)

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Re: The Rammb Slider Thread
« Reply #44 on: April 23, 2019, 08:39:34 PM »
Screengrab for Mac:

Control/Shift/4
Drag to create crop box
Hey presto

Mine stores on my desktop, not sure how I set that up or if it's the default. Looking on Finder recent files should locate it.

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Re: The Rammb Slider Thread
« Reply #45 on: April 23, 2019, 08:50:19 PM »
Thank you Susan,

but i was looking for a GIF creating tool. Screenshots are well understood. :)

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Re: The Rammb Slider Thread
« Reply #46 on: April 24, 2019, 12:34:42 PM »
Thank you Susan,

but i was looking for a GIF creating tool. Screenshots are well understood. :)

I did a google for freebies, and found this helped----
 https://www.techsupportalert.com/best-free-animated-gif-maker.htm

I decided not to download a program and instead use an on-line freebie --- http://gifmaker.org/

"So simple even a professional can use it"
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« Last Edit: April 24, 2019, 01:26:53 PM by gerontocrat »
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Re: The Rammb Slider Thread
« Reply #47 on: April 24, 2019, 01:23:49 PM »
That's cool Gerontocrat. That first tool seems to be overkill but it has what i need (i think). Downloading it now.

Edit: Woopsie... 45 bucks for the pro version which is needed to create GIFs. Also has no screen grap feature. Deleted again.  ;D

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Re: The Rammb Slider Thread
« Reply #48 on: April 25, 2019, 07:38:53 AM »
This is a GIF showing two days of ice movement at the coast of Alaska.

Day/Night Band

(Click GIF to play GIF)

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Re: The Rammb Slider Thread
« Reply #49 on: April 25, 2019, 01:32:31 PM »
That's weird, i don't have that Phil. It's not pre-installed for me and can't find it in the appstore.  :-\

Are you using the Mojave operating system, it might not be on that?

https://appletoolbox.com/2013/01/how-to-use-mac-os-x-grab-utility-to-take-screenshots/#Grab_Utility_in_macOS_Mojave_and_Above