VIIRS NOAA-20 Geolocation Problem?

Please enter here to ask a question about any NASA Science related topics!
Post Reply
marco.bracaglia
Posts: 7
Joined: Fri May 03, 2019 8:55 am America/New_York

VIIRS NOAA-20 Geolocation Problem?

by marco.bracaglia » Fri May 03, 2019 9:01 am America/New_York

Hi,
I’m starting working on VIIRS-NOAA 20 L2 data, focusing on the North Adriatic Sea.  Doing some comparisons with other sensor data (VIIRS S-NPP, AQUA, TERRA) I noticed that the VIIRS-NOOA20 data are shifted south-eastward.
As an example, I have re-projected using SEADAS one granule for each VIIRS sensor, acquired on the North Adriatic Sea on 31 October 2018 (11:18 NOAA 20 and 12:12 S-NPP). You can see a notable shift between the two images. Also, the map for CLDICE flag for NOAA 20 shows red dots following the coastlines (so the red dot are probably land pixels, that the sensor qualifies as CLDICE due to radiance intensity).
I have noted this behaviour also for other images: is this a geo-location problem along the scan lines?

Image: https://ibb.co/WpFHZr1

Tags:

OB.DAAC - SeanBailey
User Services
User Services
Posts: 1195
Joined: Wed Sep 18, 2019 6:15 pm America/New_York
Answers: 1

VIIRS NOAA-20 Geolocation Problem?

by OB.DAAC - SeanBailey » Sun May 05, 2019 1:59 pm America/New_York

Looks like it...:eek:
We'll pop the hood and see which cog is out of whack.

Sean

OB.DAAC - SeanBailey
User Services
User Services
Posts: 1195
Joined: Wed Sep 18, 2019 6:15 pm America/New_York
Answers: 1

VIIRS NOAA-20 Geolocation Problem?

by OB.DAAC - SeanBailey » Thu May 09, 2019 10:35 am America/New_York

OK, the issue has been identified.  The fix is simple (mis-configured LUT), but requires reprocessing.  We will initiate a reprocessing shortly.
Thanks for alerting us to the problem :grin:

Sean

marco.bracaglia
Posts: 7
Joined: Fri May 03, 2019 8:55 am America/New_York

VIIRS NOAA-20 Geolocation Problem?

by marco.bracaglia » Wed Sep 04, 2019 6:06 am America/New_York

Dear Sean,
are there any updates on the reprocessing?
Thank you,
Regards

Marco

OB.DAAC - SeanBailey
User Services
User Services
Posts: 1195
Joined: Wed Sep 18, 2019 6:15 pm America/New_York
Answers: 1

VIIRS NOAA-20 Geolocation Problem?

by OB.DAAC - SeanBailey » Wed Sep 04, 2019 8:07 am America/New_York

Well, it was initiated and completed within a couple of days of your original post...
Sean

marco.bracaglia
Posts: 7
Joined: Fri May 03, 2019 8:55 am America/New_York

VIIRS NOAA-20 Geolocation Problem?

by marco.bracaglia » Fri Sep 13, 2019 9:17 am America/New_York

Thank you very much Sean.
Regards,
Marco

Post Reply