Search found 41 matches

by dem1
Mon Jan 06, 2020 9:45 am America/New_York
Forum: Questions/Comments
Question: Missing VIIRS (N/J1) products
Replies: 0

Missing VIIRS (N/J1) products

Hi,We found 2 missing VIIRSJ1 products: the file_search utility returns them but the getfile always fails (error 404):2019/03/27/V2019086140000.L2_JPSS1_OC.nc2019/03/29/V2019088215400.L2_JPSS1_OC.ncWe found also several QL/QLP products files from November not replaced by RF as expected:viirsj1_R2018...
by dem1
Wed Sep 04, 2019 10:28 am America/New_York
Forum: Questions/Comments
Question: STRAYLIGHT flag on coastal areas
Replies: 3

STRAYLIGHT flag on coastal areas

Thanks Sean.

Now I understand the differences we observed, they come from the HILT flag: it is always raised on lands for MODIST/A and SeaWiFS, but for VIIRSN/J1 this flag seems not used because I did not found any HILT pixels on products, am I right?

Thanks,
Julien
by dem1
Mon Sep 02, 2019 9:07 am America/New_York
Forum: Questions/Comments
Question: STRAYLIGHT flag on coastal areas
Replies: 3

STRAYLIGHT flag on coastal areas

Hi,We found that the STRAYLIGHT flag logic on coastal areas is not the same for all sensors:- SeaWiFS: there is always a band of STRAYLIGHT pixels along the coastline (1 GAC or 3 MLAC pixels), and LAND pixels are always fully flagged STRAYLIGHT- VIIRSN/J1: the STRAYLIGHT on coastal areas follow the ...
by dem1
Fri Aug 30, 2019 8:35 am America/New_York
Forum: Questions/Comments
Question: SeaWiFS STRAYLIGHT GAC vs MLAC
Replies: 3

SeaWiFS STRAYLIGHT GAC vs MLAC

Thanks Sean.If I'm not wrong other LAC sensors (MODIS/VIIRS) use simplified masking too?We observe that SeaWiFS MLAC are more contaminated by cloud borders than GAC and other LAC sensors, do you confirm this? So we are thinking to enlarge CLDICE+STRAYLIGHT for MLAC in our Level-3 processor. Do y...
by dem1
Fri Aug 30, 2019 4:23 am America/New_York
Forum: Questions/Comments
Question: SeaWiFS STRAYLIGHT GAC vs MLAC
Replies: 3

SeaWiFS STRAYLIGHT GAC vs MLAC

Hi,Is it normal that the STRAYLIGHT flag for SeaWiFS is not consistent between GAC and MLAC products?For GAC it seems it is a simple fixed kernel around CLDICE but for MLAC it seems not the same algorithm.When removing CLDICE and STRAYLIGHT pixels, are MLAC products more contaminated by bad cloud bo...
by dem1
Thu Jun 13, 2019 9:28 am America/New_York
Forum: Questions/Comments
Question: Blacklisted IPs ?
Replies: 1

Blacklisted IPs ?

Hi,It seems that 2 of our IPs where blacklisted since yesterday since 4pm30 UTC:xx.xxx.xx.xx : from this IP we download on the fly new L2 products but we ensure a minimum delay of 5 seconds between each HTTP request to your websitexx.xxx.xx.xx : from this IP we download on the fly new L3 products (s...
by dem1
Wed Apr 03, 2019 6:14 am America/New_York
Forum: Questions/Comments
Question: VIIRS JPSS-1 filtering of QLP, QL and RF products
Replies: 2

VIIRS JPSS-1 filtering of QLP, QL and RF products

In fact my general needs are to download only new or updated files comparing to my local archive.After reading of several posts about NRT mirroring maybe I see another solution: I can ask with file_search for the files processed the last days using psdate and use the returned checksum or cdate to de...
by dem1
Tue Apr 02, 2019 12:21 pm America/New_York
Forum: Questions/Comments
Question: VIIRS JPSS-1 filtering of QLP, QL and RF products
Replies: 2

VIIRS JPSS-1 filtering of QLP, QL and RF products

Hi,We try to download on-the-fly new VIIRS JPSS-1 QLP, QL and RF products (and differentiate them), is there any way to know from an option of the query on-line command file_search if a product is QL or QLP or RF?For VIIRS SNPP we set up a non-extracted subscription to the QL data to get only QL wit...
by dem1
Tue Mar 26, 2019 9:55 am America/New_York
Forum: Questions/Comments
Question: Select only day product with file_search tool?
Replies: 1

Select only day product with file_search tool?

Hi,

Is it possible to select only day product with the file_search tool? Like the Day/Night buttons on https://oceancolor.gsfc.nasa.gov/cgi/browse.pl?sen=am

Sorry if the answer is already in the forum but I did not found it.

Thanks in advance,
Julien
by dem1
Mon Mar 18, 2019 8:49 am America/New_York
Forum: Questions/Comments
Question: MODIS-Aqua QL subscription gives QLP
Replies: 8

MODIS-Aqua QL subscription gives QLP

Thanks Sean for the explanations,

For this granule I compared the chlor_a of the 2 versions of 2018.0 (9.3.0-V2019.0 vs 9.2.0-V2017.0.3) and found that the values are not exactly the same. Is it normal? Are the 2 versions scientifically equivalent?

Regards,
Julien