Profile plot Sea surface temperature

Optical Toolbox
1

Hi everyone, it’s my first time here.

I’m trying to compute a profile plot on sea surface temperature on snap wtih the sentinel 3a data.

Here is the complete name of the file I downloaded:
S3A_SL_2_WST____20201120T205457_20201120T223557_20201122T084552_6059_065_185______MAR_O_NT_003.SEN3

I’ve drawn a line but when I want to select if in the profile plot window using ROI mask or mask manager I can’t select the mask thus I can’t obtain a profile plot.

Could someone help me?

2

The line is a “geometry”. There is a show/hide geometry button. Just select the geometry and profile plot should use it, but sometimes a geometry drawn by hand has glitches that seem to confuse the profile plot and you won’t get a profile plot. The ROI button is used to mask part of the geometry, it does not select the “transect” (in your case, the “line”) geometry.

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3

Hello everyone,

I am experiencing the same problem mentioned above: when trying to visualize a profile plot from a line draw in a Sentinel-3 sea surface temperature image, the profile plot remains empty, the table look shows all NaN for the line transect (see image). I have tried selecting ROI mask (geometry), but nothing appears. The profile plot with an Ocean colour image does work, but not for temperature (i.e. repeating the same procedure). I am using Snap version 9 on a Ubuntu machine, but some of my students (with various laptop configurations, Windows & Mac) have the same issue. Any hint would be appreciated!

Thanks,
Aida

Screenshot from 2022-10-31 16-42-43
Screenshot from 2022-10-31 16-42-431920×1080 454 KB

4

Hello Aida,

This is a known issue. It is caused by a change in the product format.
There is a link to the ticket in our bug databse:
[SIIITBX-422] Sentinel-3 WST products have issues with geolocation since PUG v3.35 - JIRA (atlassian.net)

Meanwhile, EUMETSAT agree to our suggested solution. This fix will be included in the next update of the S3TBX. But I can’t tell a date right now.

5

Hi Marco,

thank you for the update. I did look for posts regarding this issue but I only could find this one!

Best regards,
Aida

6

Hi Aida, Marco,

this issue is resolved in SNAP 10.

Cheers,
Tom

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