Date   

Re: A-68A turning again.

Ferdinand Valk
 

Great, I’m sitting at attention!

 

From: MSG-1@groups.io On Behalf Of Ernst Lobsiger via groups.io
Sent: Thursday, 24 December, 2020 16:23
To: MSG-1@groups.io
Subject: Re: [MSG-1] A-68A turning again.

//

But yes, it's inside Satpy for SSH. I make some latest tests for the absolute minimum you have to do (files you have to copy into your personal pppconfig) to make it work. Then I will publish my solution here. The latest Satpy documetation is still somewhat hard to read in this field. Stay tuned!

Regards,
Ernst

 


Re: A-68A turning again.

Ernst Lobsiger
 

On Thu, Dec 24, 2020 at 08:06 AM, Ferdinand Valk wrote:
Excellent. Does that mean that you have found a solution to single versus dual polarization (SSH / SDH) issue in Pytroll/Satpy?
Ferdinand,

TBH I'am not a composite guru at all. Christian Peters is quite experienced in this field. But yes, it's inside Satpy for SSH. I make some latest tests for the absolute minimum you have to do
(files you have to copy into your personal pppconfig) to make it work. Then I will publish my solution here. The latest Satpy documetation is still somewhat hard to read in this field. Stay tuned!

Regards,
Ernst


Re: A-68A turning again.

Ferdinand Valk
 

Ernst,

 

Excellent. Does that mean that you have found a solution to single versus dual polarization (SSH / SDH) issue in Pytroll/Satpy? Or do you mean with homebrew that you solved it outside of Satpy?

 

I couldn’t get single (hh) to work thus far.

 

Cheers,

Ferdinand

 

From: MSG-1@groups.io On Behalf Of Ernst Lobsiger via groups.io
Sent: Thursday, 24 December, 2020 14:24
To: MSG-1@groups.io
Subject: Re: [MSG-1] A-68A turning again.

 

John and Ferdinand,

while John noticed the first crack accross the A68a finger (on a Metop image!!) and Ferdinand added a final Sentinel-1A SAR-C measurement *.tiff confirmation,
I was unable to read the same GRDM file with Pytroll/Satpy because it only contained hh data. I have fixed that now by adding two homebrew sar-c composites.

Cheers,
Ernst


Re: A-68A 'finger' breaking away.

Ferdinand Valk
 

Thanks for the image update John.

 

Here is a link to the S1B image of yesterday and the S3A of today.

A68 (fvalk.com)

 

The Sar image can be opened in full resolution.

 

Ferdinand

 

 

From: MSG-1@groups.io On Behalf Of geojohnt via groups.io
Sent: Thursday, 24 December, 2020 12:59
To: msg-1@groups.io; geo-subscribers@groups.io
Subject: [MSG-1] A-68A 'finger' breaking away.

 

Ooops,

 

I forgot to attach the Metop images.

 

John.

 

+++++++++++++++++++

 


Re: A-68A turning again.

Ernst Lobsiger
 

John and Ferdinand,

while John noticed the first crack accross the A68a finger (on a Metop image!!) and Ferdinand added a final Sentinel-1A SAR-C measurement *.tiff confirmation,
I was unable to read the same GRDM file with Pytroll/Satpy because it only contained hh data. I have fixed that now by adding two homebrew sar-c composites.

Cheers,
Ernst


A-68A 'finger' breaking away.

geojohnt@...
 

Ooops,

I forgot to attach the Metop images.

John.

+++++++++++++++++++


-----Original Message-----
From: geojohnt via groups.io <geojohnt@...>
To: MSG-1@groups.io <MSG-1@groups.io>
Sent: Thu, 24 Dec 2020 12:55
Subject: Re: [MSG-1] A-68A 'finger' breaking away.

Hello Ernst and Luc,

Great images.

And todays cloudy Metop images show that the finger had broken right away and turned.

Happy Christmas to everyone and best wishes for a hopefully better 2021.
At least it seems one 'problem' is just about to be sorted out in the UK/EU?

Regards,
John.

++++++++++++++++++++++

-----Original Message-----
From: Ernst Lobsiger via groups.io <ernst.lobsiger@...>
To: MSG-1@groups.io
Sent: Thu, 24 Dec 2020 9:09
Subject: Re: [MSG-1] A-68A 'finger' breaking away.

Hello John,

an even closer look below. This is 200 x 200km, 80m resolution (GRDM) with image width and height reduced 50%.
There should be a SAR file with 40m resolution (GRDH) on the Copernicus hub, but this will not fit in my PCs RAM.

Regards,
Ernst


Re: A-68A 'finger' breaking away.

geojohnt@...
 

Hello Ernst and Luc,

Great images.

And todays cloudy Metop images show that the finger had broken right away and turned.

Happy Christmas to everyone and best wishes for a hopefully better 2021.
At least it seems one 'problem' is just about to be sorted out in the UK/EU?

Regards,
John.

++++++++++++++++++++++

-----Original Message-----
From: Ernst Lobsiger via groups.io <ernst.lobsiger@...>
To: MSG-1@groups.io
Sent: Thu, 24 Dec 2020 9:09
Subject: Re: [MSG-1] A-68A 'finger' breaking away.

Hello John,

an even closer look below. This is 200 x 200km, 80m resolution (GRDM) with image width and height reduced 50%.
There should be a SAR file with 40m resolution (GRDH) on the Copernicus hub, but this will not fit in my PCs RAM.

Regards,
Ernst


Re: A-68A 'finger' breaking away.

Ernst Lobsiger
 

Hello John,

an even closer look below. This is 200 x 200km, 80m resolution (GRDM) with image width and height reduced 50%.
There should be a SAR file with 40m resolution (GRDH) on the Copernicus hub, but this will not fit in my PCs RAM.

Regards,
Ernst


A-68A iceberg thinning at 2.5 cm per day.

geojohnt@...
 


For those who do not subscribe to ESA news you might find this interesting regarding the icebergs possible future.

https://www.esa.int/Applications/Observing_the_Earth/CryoSat/A-68A_iceberg_thinning_at_2.5_cm_per_day

Regards,
John.



Re: A-68A 'finger' breaking away.

geojohnt@...
 

Hello Ernst,

Thanks for this.

Regards,
John.

+++++++++++++++

-----Original Message-----
From: Ernst Lobsiger via groups.io <ernst.lobsiger@...>
To: MSG-1@groups.io
Sent: Wed, 23 Dec 2020 13:53
Subject: Re: [MSG-1] A-68A 'finger' breaking away.

John,


that's what Pytroll/Satpy does with Metop.

Cheers,
Ernst


Re: A-68A 'finger' breaking away.

Ernst Lobsiger
 

John,

that's what Pytroll/Satpy does with Metop.

Cheers,
Ernst


A-68A 'finger' breaking away.

geojohnt@...
 

Hello All,

Well, it appears the inevitable is happening from todays Metop image via EUMETCast attached.

Regards,
John.





Re: [GEO-Subscribers] A-68A turning again.

geojohnt@...
 

Hello Les,

Ah, I spoke too soon in my reply to Ferdinand just now.

Thanks for your link and further down there is a link are some amazing RAF photos of the iceberg.
It's 'big!'

https://www.bbc.co.uk/news/science-environment-55196220

Regards,
John.

+++++++++++++++++++++

-----Original Message-----
From: leshamilton2004 <les.hamilton@...>
To: GEO-Subscribers@groups.io
Sent: Tue, 22 Dec 2020 16:36
Subject: Re: [GEO-Subscribers] A-68A turning again.


Re: A-68A turning again.

geojohnt@...
 

Hello Ferdinand,

Another great image, thanks.

I'm surprised, I think, given the size of this iceberg and its vicinity, that we haven't seen any 'ground based' photos from ships or surveillance aircraft.

OK it's a remote part of the ocean but this is a big iceberg.

Regards,
John.

+++++++++++++++++++++++


-----Original Message-----
From: Ferdinand Valk <fvalk@...>
To: MSG-1@groups.io
Sent: Tue, 22 Dec 2020 16:18
Subject: Re: [MSG-1] A-68A turning again.

Yes John, that is correct. The fault line I refer to in the sar image is the same as the black line you see in your Metop and also in the attached Sentinel 3B image of today. The black in the colour image is the surface melt filling up the crack: this is the principal reason to suspect this line to give way first.
 
From: MSG-1@groups.io On Behalf Of geojohnt via groups.io
Sent: Tuesday, 22 December, 2020 15:42
To: MSG-1@groups.io
Subject: Re: [MSG-1] A-68A turning again.
 
Hello Ferdinand,
 
Thanks for the amazing image.
Such incredible detail and as you say bits floating nearby having broken off.
 
I agree about the cloud edge shadow line but enlarging todays Metop image to 300% although blurred appears to show(?) a black crack/line/area - which again could be shadow - at the base area of the finger, but it seems to correspond to the fault line in your image?
 
Regards,
John.

++++++++++++++++++++++++++
-----Original Message-----
From: Ferdinand Valk <fvalk@...>
To: MSG-1@groups.io
Sent: Tue, 22 Dec 2020 14:25
Subject: Re: [MSG-1] A-68A turning again.
There is indeed some calving at the pointed tip. Bits can be seen floating nearby. The line you see across the centre is caused by cloud. Most of the fault lines visible in the sar imagery run lengthwise through the slab; there is one major fault though at the root of the pointing finger that may well be the first to rupture.
 
Ferdinand
 
From: MSG-1@groups.io On Behalf Of geojohnt via groups.io
Sent: Tuesday, 22 December, 2020 12:55
To: msg-1@groups.io; geo-subscribers@groups.io
Subject: [MSG-1] A-68A turning again.
 
All,
 
Todays Metop image via EUMETCast shows the iceberg rotating again.
And, is the pointed bit breaking away?
 
Not sure about the line across the centre of the iceberg - cloud edge shadow?
 
Regards,
John.


Re: A-68A turning again.

Ferdinand Valk
 

Ernst,

 

Thanks for the details. I had already moved east and changed to landscape format here, but your suggestion is very useful.

Today the Copernicus hub was unavailable most of the time and so only now I got today’s data.

S1A_EW_GRDM_1SSH_20201222T071734_20201222T071834_035795_0430AC_13DF.SAFE

The crop above shows that the fault line I expected to rupture did precisely that today. A disconnect of the finger is clearly visible as well as the separation of the knuckles. Things unfold really fast!

 

Cheers,

Ferdinand

 

From: MSG-1@groups.io On Behalf Of Ernst Lobsiger via groups.io
Sent: Tuesday, 22 December, 2020 21:18
To: MSG-1@groups.io
Subject: Re: [MSG-1] A-68A turning again.

 

Ferdinand,
Users of my Sentinel-3A/B scripts,

an exeptional Sentinel-3B image from A68a today. It seems the iceberg will leave the sgeorgia300 area soon. The easiest way to follow will be an update of the personal areas.yaml with something like:
//snip

 


Re: A-68A turning again.

Ernst Lobsiger
 

Ferdinand,
Users of my Sentinel-3A/B scripts,

an exeptional Sentinel-3B image from A68a today. It seems the iceberg will leave the sgeorgia300 area soon. The easiest way to follow will be an update of the personal areas.yaml with something like:

sgeorgia300b:
  description: Iceberg A-68a (OLCI Sentinel-3A/3B)
  projection:
    proj: stere
    ellps: WGS84
    lat_0: -56.00
    lon_0: -36.00
  shape:
    height: 2000
    width: 2000
  area_extent:
    lower_left_xy: [-270000.0, -270000.0]
    upper_right_xy: [270000.0, 270000.0]

A result from today using this area is attached. Shape must always be in sync with area_extent and resolution of the instrument in use at SSP. Stere is conformal, grid lines must cross at 90°.

Cheers,
Ernst


Re: A-68A turning again.

Ferdinand Valk
 

Yes John, that is correct. The fault line I refer to in the sar image is the same as the black line you see in your Metop and also in the attached Sentinel 3B image of today. The black in the colour image is the surface melt filling up the crack: this is the principal reason to suspect this line to give way first.

 

From: MSG-1@groups.io On Behalf Of geojohnt via groups.io
Sent: Tuesday, 22 December, 2020 15:42
To: MSG-1@groups.io
Subject: Re: [MSG-1] A-68A turning again.

 

Hello Ferdinand,

 

Thanks for the amazing image.

Such incredible detail and as you say bits floating nearby having broken off.

 

I agree about the cloud edge shadow line but enlarging todays Metop image to 300% although blurred appears to show(?) a black crack/line/area - which again could be shadow - at the base area of the finger, but it seems to correspond to the fault line in your image?

 

Regards,

John.


++++++++++++++++++++++++++

-----Original Message-----
From: Ferdinand Valk <fvalk@...>
To: MSG-1@groups.io
Sent: Tue, 22 Dec 2020 14:25
Subject: Re: [MSG-1] A-68A turning again.

There is indeed some calving at the pointed tip. Bits can be seen floating nearby. The line you see across the centre is caused by cloud. Most of the fault lines visible in the sar imagery run lengthwise through the slab; there is one major fault though at the root of the pointing finger that may well be the first to rupture.

 

Ferdinand

 

From: MSG-1@groups.io On Behalf Of geojohnt via groups.io
Sent: Tuesday, 22 December, 2020 12:55
To: msg-1@groups.io; geo-subscribers@groups.io
Subject: [MSG-1] A-68A turning again.

 

All,

 

Todays Metop image via EUMETCast shows the iceberg rotating again.

And, is the pointed bit breaking away?

 

Not sure about the line across the centre of the iceberg - cloud edge shadow?

 

Regards,

John.


Re: A-68A turning again.

geojohnt@...
 

Hello Ferdinand,

Thanks for the amazing image.
Such incredible detail and as you say bits floating nearby having broken off.

I agree about the cloud edge shadow line but enlarging todays Metop image to 300% although blurred appears to show(?) a black crack/line/area - which again could be shadow - at the base area of the finger, but it seems to correspond to the fault line in your image?

Regards,
John.

++++++++++++++++++++++++++

-----Original Message-----
From: Ferdinand Valk <fvalk@...>
To: MSG-1@groups.io
Sent: Tue, 22 Dec 2020 14:25
Subject: Re: [MSG-1] A-68A turning again.

There is indeed some calving at the pointed tip. Bits can be seen floating nearby. The line you see across the centre is caused by cloud. Most of the fault lines visible in the sar imagery run lengthwise through the slab; there is one major fault though at the root of the pointing finger that may well be the first to rupture.
 
Ferdinand
 
From: MSG-1@groups.io On Behalf Of geojohnt via groups.io
Sent: Tuesday, 22 December, 2020 12:55
To: msg-1@groups.io; geo-subscribers@groups.io
Subject: [MSG-1] A-68A turning again.
 
All,
 
Todays Metop image via EUMETCast shows the iceberg rotating again.
And, is the pointed bit breaking away?
 
Not sure about the line across the centre of the iceberg - cloud edge shadow?
 
Regards,
John.


Re: A-68A turning again.

Ferdinand Valk
 

There is indeed some calving at the pointed tip. Bits can be seen floating nearby. The line you see across the centre is caused by cloud. Most of the fault lines visible in the sar imagery run lengthwise through the slab; there is one major fault though at the root of the pointing finger that may well be the first to rupture.

 

Ferdinand

 

From: MSG-1@groups.io On Behalf Of geojohnt via groups.io
Sent: Tuesday, 22 December, 2020 12:55
To: msg-1@groups.io; geo-subscribers@groups.io
Subject: [MSG-1] A-68A turning again.

 

All,

 

Todays Metop image via EUMETCast shows the iceberg rotating again.

And, is the pointed bit breaking away?

 

Not sure about the line across the centre of the iceberg - cloud edge shadow?

 

Regards,

John.


A-68A turning again.

geojohnt@...
 

All,

Todays Metop image via EUMETCast shows the iceberg rotating again.
And, is the pointed bit breaking away?

Not sure about the line across the centre of the iceberg - cloud edge shadow?

Regards,
John.

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