Search found 1448 matches

by OB.DAAC - SeanBailey
Wed Jul 05, 2023 6:25 pm America/New_York
Forum: Questions/Comments
Question: Missing Data SST 8-DAY
Replies: 1

Re: Missing Data SST 8-DAY

Based on the information you provided, I believe you are looking at the bin file (L3b). The bin file is not a raster image format (as the mapped - L3m - product is), rather is is more akin to a spreadsheet. It only contains values where there are data. The bin file format is described here: https://...
by OB.DAAC - SeanBailey
Tue Jul 04, 2023 8:41 am America/New_York
Forum: Questions/Comments
Question: Seadas software
Replies: 1

Re: Seadas software

Yves, While it is true that we produce and distribute remote sensing reflectance data for MODIS that include the higher spatial resolution bands (469nm, 555, and 645nm), none of the ocean color products we produce use bands other than the nominal 1km spatial resolution ("ocean") bands. For...
by OB.DAAC - SeanBailey
Wed Jun 21, 2023 7:26 pm America/New_York
Forum: Questions/Comments
Question: Kd-490 scale factor
Replies: 1

Re: Kd-490 scale factor

For efficient storage. A 16bit integer takes less space to store than a 32bit float.

Sean
by OB.DAAC - SeanBailey
Mon Jun 12, 2023 6:05 pm America/New_York
Forum: Questions/Comments
Question: Ocean color chlorophyll-a unit
Replies: 1

Re: Ocean color chlorophyll-a unit

The measurement of chlorophyll concentration is indeed a volumetric measurement, thus the units of milligrams per cubic meter. The algorithm employed can relate the observed surface reflectance spectrum to a chlorophyll concentration as it was developed using coincident in situ measurements of remot...
by OB.DAAC - SeanBailey
Mon Jun 05, 2023 9:16 pm America/New_York
Forum: Questions/Comments
Question: OCM3 processing error, please help me
Replies: 1

Re: OCM3 processing error, please help me

SeaDAS does not support OCM3.

Sean
by OB.DAAC - SeanBailey
Mon Jun 05, 2023 9:13 pm America/New_York
Forum: Questions/Comments
Question: Rayleigh-corrected reflectance
Replies: 1

Re: Rayleigh-corrected reflectance

Yes, rhos is Rayleigh corrected reflectance.

Sean
by OB.DAAC - SeanBailey
Mon Jun 05, 2023 9:08 pm America/New_York
Forum: Questions/Comments
Question: Processing Landsat 8 images with L2gen
Replies: 4

Re: Processing Landsat 8 images with L2gen

You seem to be attempting to process a L2 file. This will not work, as l2gen expects a L1 file as input.

Sean
by OB.DAAC - SeanBailey
Wed May 31, 2023 5:58 pm America/New_York
Forum: Questions/Comments
Question: l2gen algorithm - source code error
Replies: 4

Re: l2gen algorithm - source code error

Fabio, When the Hu algorithm is above 0.25 mg m^-3, but below 0.35 mg m^-3, we blend Hu with OCx. As Lachlan pointed out: The decision point in the function chl_oci that selects chl_hu, chl_ocx, or a blend of the two, is dependent only the magnitude of chl_hu (i.e., chl1). The code is correct. Sean
by OB.DAAC - SeanBailey
Wed May 31, 2023 8:29 am America/New_York
Forum: Questions/Comments
Question: ATMWARN not used in VIIRS PIC l2bin flags
Replies: 1

Re: ATMWARN not used in VIIRS PIC l2bin flags

Julien,

Indeed, there is a discrepancy with the VIIRS PIC flaguse parameter. The good news is that the impact is insignificant. There is an extremely small number of pixels flagged as ATMWARN that are not also flagged by another of the flags in use as masks for the product.

Regards,
Sean
by OB.DAAC - SeanBailey
Mon May 22, 2023 7:42 am America/New_York
Forum: Questions/Comments
Question: Geolocation shift for Chesapeake Bay scenes
Replies: 1

Re: Geolocation shift for Chesapeake Bay scenes

Sami, Geolocation of the Hawkeye imagery is a bit of a challenge: https://oceancolor.gsfc.nasa.gov/data/hawkeye/geolocation/ While we do our best to minimize the geolocation errors, we cannot completely eliminate them. Some scenes are worse than others. (or if you take an optimistic view, some scene...