A68 continued


Ferdinand Valk
 

Sar imaging in EW mode seldomly covers South Georgia itself and never in
full. For a full view one would need the GRDH-1SDV combination files.
To bring the current situation into context I combined yesterdays GRDH with
Dec 7 South Georgia, complemented with the SDV.
Supposedly, now that A68 enters the shallow waters around the island, it
will get stuck soon and the stress on the iceberg may cause it to start
breaking up.

Cheers,
Ferdinand


Ernst Lobsiger
 

Ferdinand,

you advance in stunning speed. When I combined 2 GRDM files I could only do that with MultiScene.
Your image looks like MultiScene where you stack ("blend") a list [] of scenes. So here my questions:

Where did you get the 1SDV file from?
Can it also be read with  reader 'sar-c_safe'?

Best regards
Ernst

There is now an S1B GRDM from yesterday December 13th. Didn't check GRDH, not enough memory.
Tomorrow 15th we should get an S1A GRDM/GRDH image that covers South Georgia and A68a again.


Graham Woolf
 

Hi Ernst

How are you finding these files - I cant seem to find any on the Copernicus hub

Im trying to use wget but its not returning any files

Regards

Graham


Ernst Lobsiger
 

On Mon, Dec 14, 2020 at 03:54 AM, Graham Woolf wrote:
How are you finding these files - I cant seem to find any on the Copernicus hub
Graham

Here is a list of SAR files you can look for (sorry, all GRDM :-):

S1A_EW_GRDM_1SDH_20201203T072534_20201203T072634_035518_042716_6F8E.zip
S1A_EW_GRDM_1SDH_20201207T215924_20201207T220024_035585_04296C_D084.zip
S1B_EW_GRDM_1SDH_20201201T215843_20201201T215943_024514_02E9FD_3C2F.zip
S1B_EW_GRDM_1SDH_20201209T072431_20201209T072535_024622_02ED88_2608.zip
S1B_EW_GRDM_1SDH_20201209T072535_20201209T072635_024622_02ED88_4503.zip
S1B_EW_GRDM_1SDH_20201213T215842_20201213T215942_024689_02EFAD_7275.zip

Ernst


Graham Woolf
 

Hi Ernst

Thanks

This is the script I am using but its not finding any files

c:\Tools\Wget\wget --user **** --password *******  https://scihub.copernicus.eu/dhus/odata/v1/Product(S1A_EW_GRDM_1SDH_20201203T072534_20201203T072634_035518_042716_6F8E.zip)

Its connecting OK but I suspect the path might be wrong but Im not sure of the correct one

Regards

Graham


Ferdinand Valk
 

Ernst,

 

No no no, maybe I do advance a bit but not as much as you assume. Let me explain.

 

First the 1SDV (full name S1B_IW_GRDH_1SDV_20201211T070838_20201211T070907_024651_02EE71_2FF6.SAFE) was downloaded from the Sentinel hub. It was first run with the unmodified sarmicro script and the debug indicated that it couldn’t manage the data files due to sar-c_safe. I tried to see where things were running off-track within sar-c_safe and came to the conclusion that it didn’t like the DV polarization. So, just to test I altered DV to DH and to be consistent the vh/vh in the xml names to hh.hv.

Then the file was properly decoded albeit with wrong colour assignment. But at least it decodes. Next step is to see if this can be properly included in sar-c_safe which most likely is as yet out of my league, but I’ll try anyway.

Just for fun I attach the 1SDV image (8000x8000) immediately after decoding and prior to any editing.

 

Combining I did NOT do via Multiscene but a quicky via Photoshop, which was simple as I had used the same projection for the three base images. So you did give me more credit than I deserve.

 

Really looking forward to tomorrow!

 

Cheers,

Ferdinand

 

From: MSG-1@groups.io On Behalf Of Ernst Lobsiger via groups.io
Sent: Monday, 14 December, 2020 11:52
To: MSG-1@groups.io
Subject: Re: [MSG-1] A68 continued

 

Ferdinand,

you advance in stunning speed. When I combined 2 GRDM files I could only do that with MultiScene.
Your image looks like MultiScene where you stack ("blend") a list [] of scenes. So here my questions:

Where did you get the 1SDV file from?
Can it also be read with  reader 'sar-c_safe'?

Best regards
Ernst

There is now an S1B GRDM from yesterday December 13th. Didn't check GRDH, not enough memory.
Tomorrow 15th we should get an S1A GRDM/GRDH image that covers South Georgia and A68a again.