Search found 12 matches

by clays_bio
Wed Dec 21, 2022 7:49 am America/New_York
Forum: Questions/Comments
Question: Level-3 binned data on ERRDAP
Replies: 2

Level-3 binned data on ERRDAP

Hi everyone, I have daily netCDFs containing a regionally-tuned version of OCx chlorophyll for the Northwest Atlantic, and have kept them in the 4km-resolution level-3 binned spatial format of the L3b Rrs data from NASA OBPG that was used to model them. I've been in touch with CIOOS Atlantic to try ...
by clays_bio
Fri Dec 09, 2022 7:52 am America/New_York
Forum: Questions/Comments
Question: When are NRT files replaced?
Replies: 4

Re: When are NRT files replaced?

Thanks for clearing that up! I'll set up some subscriptions, that sounds like the best route.
by clays_bio
Wed Dec 07, 2022 12:02 pm America/New_York
Forum: Questions/Comments
Question: When are NRT files replaced?
Replies: 4

Re: When are NRT files replaced?

Thanks! Is this different from the way it worked in the old filenaming system, or were the files from the previous day NRT but not labelled in the filename? Do subscriptions for new MODIS/VIIRS/OLCI data include only the final processed data, or NRT, or both? I'm thinking that option might be easier...
by clays_bio
Tue Dec 06, 2022 9:39 am America/New_York
Forum: Questions/Comments
Question: When are NRT files replaced?
Replies: 4

When are NRT files replaced?

Apologies if this has been addressed somewhere, but is there a schedule for the replacement of NRT files for MODIS, VIIRS, and OLCI (L2 OC and L3b CHL/PAR/RRS/SST)? With the R2018 reprocessing I downloaded files when they were made available and (maybe incorrectly?) assumed they were the final quali...
by clays_bio
Mon Jul 04, 2022 8:10 am America/New_York
Forum: Questions/Comments
Question: VIIRS striping and M1/M2 band comparisons to MODIS
Replies: 2

Re: VIIRS striping and M1/M2 band comparisons to MODIS

Hi Sean,

That's excellent news! Thanks for clearing that up. I'll check it out again after the reprocessing.

-Stephanie
by clays_bio
Thu Jun 30, 2022 1:33 pm America/New_York
Forum: Questions/Comments
Question: VIIRS striping and M1/M2 band comparisons to MODIS
Replies: 2

VIIRS striping and M1/M2 band comparisons to MODIS

Hi everyone, I'm comparing the VIIRS-SNPP times series to MODIS-Aqua and noticing an increase of striping in recent years (~2017-present). It's less noticeable in OCx chlorophyll-a, but very obvious in GSM (screenshot of 8day log10 chlorophyll images using the GSM_GS algorithm from Clay et al 2019, ...
by clays_bio
Thu Dec 02, 2021 11:01 am America/New_York
Forum: Questions/Comments
Question: Satellite PAR formula and Gregg-Carder light model
Replies: 3

Re: Satellite PAR formula and Gregg-Carder light model

Thanks Sean! I think my main confusion is the value that the satellite planar radiance represents, since I want to make sure I end up with the equivalent value modelled from Gregg-Carder. I was mixing up steps of integrating vs averaging and converting between energy and number of photons per waveba...
by clays_bio
Wed Nov 24, 2021 2:57 pm America/New_York
Forum: Questions/Comments
Question: Satellite PAR formula and Gregg-Carder light model
Replies: 3

Satellite PAR formula and Gregg-Carder light model

Hi everyone! I'm modelling hourly surface irradiance from 400-700nm using the Gregg-Carder model and trying to figure out how to properly convert it to the same units as the satellite PAR product so it can be scaled, but I'm having trouble following the steps in the PAR model. I would like to use th...
by clays_bio
Wed Mar 03, 2021 9:09 am America/New_York
Forum: Questions/Comments
Question: chlor_a Hu color index wavebands and coefficients
Replies: 5

Re: chlor_a Hu color index wavebands and coefficients

Awesome! I think that answers all my questions about it. In the future it would be good to have this info available on the chlor_a description page (formula for the conversion of the color index to chlorophyll and the current coefficients in use, the blending formula, and the link to the conv_rrs_to...
by clays_bio
Tue Mar 02, 2021 7:04 am America/New_York
Forum: Questions/Comments
Question: chlor_a Hu color index wavebands and coefficients
Replies: 5

Re: chlor_a Hu color index wavebands and coefficients

Thanks for your help! That clears up my question about the coefficients, but I'm still a little unclear about the non-SeaWiFS wavebands used in the algorithm: The chlor_a description page says the algorithm uses the instrument-specific wavebands closest to 443, 555, and 670... so for MODIS this shou...