Search found 1262 matches

by OB.DAAC - SeanBailey
Mon May 23, 2022 12:28 pm America/New_York
Forum: Questions/Comments
Question: Seadas аtmospheric correction on land
Replies: 2

Re: Seadas аtmospheric correction on land

The NDVI product is computed from Rayleigh corrected reflectance. Over land, l2gen computes the Rayleigh contribution following the work of Jacques Descloitres (briefly described in Gumley, Descloitres, and Schmaltz. 2003. "Creating reprojected true color MODIS images: A tutorial." Univers...
by OB.DAAC - SeanBailey
Fri May 20, 2022 9:13 am America/New_York
Forum: Questions/Comments
Question: How to Open and Read Modis-Aqua L0 data file
Replies: 4

Re: How to Open and Read Modis-Aqua L0 data file

No, there is no tool that can read the L0 files (at least none that I am aware). The L0 files are just a the raw binary packet stream from the instrument, which as I said before is not a particularly friendly format. All of the information from the L0 is contained in the L1A file, but organized in a...
by OB.DAAC - SeanBailey
Thu May 19, 2022 1:23 pm America/New_York
Forum: Questions/Comments
Question: How to Open and Read Modis-Aqua L0 data file
Replies: 4

Re: How to Open and Read Modis-Aqua L0 data file

The L0 format isn't really a friendly one. We distribute them for those who wish to concatenate several together to generate L1 files that are not in the 5-minute granularization that we distribute. Our SeaDAS package includes scripts and programs necessary to convert the L0 binary data into the mor...
by OB.DAAC - SeanBailey
Thu May 19, 2022 1:10 pm America/New_York
Forum: Questions/Comments
Question: Changes to Ocean color data web portal
Replies: 1

Re: Changes to Ocean color data web portal

Jacques,

Correct, both URLs are still active, although the older one is deprecated. We will likely discontinue support for the older path on June 1st (but haven't set that in stone yet). Just know it WILL go away and relatively soon.

Regards,
Sean
by OB.DAAC - SeanBailey
Wed May 18, 2022 12:43 pm America/New_York
Forum: Questions/Comments
Question: Run modis_GEO without network?
Replies: 3

Re: Run modis_GEO without network?

modis_atteph populates the DB that modis_GEO uses.
by OB.DAAC - SeanBailey
Tue May 17, 2022 3:23 pm America/New_York
Forum: Questions/Comments
Question: Run modis_GEO without network?
Replies: 3

Re: Run modis_GEO without network?

Short answer: yes.

Long(er) answer: A network connection is required to obtain the ATT/EPH data (and popuate the local sqlite database used by the script). Once those data are obtained (and database populated), modis_GEO will run without a network connection.

Sean
by OB.DAAC - SeanBailey
Thu Apr 07, 2022 9:02 am America/New_York
Forum: Questions/Comments
Question: The value of a measured by modis
Replies: 3

Re: The value of a measured by modis

There is a known bug in the processing of the IOP products related to the pure water values for aw and bbw. The current operational code uses an ASCII table of values that was updated prior to the last reprocessing. In that update, the header records for that file had a blank line and a couple of er...
by OB.DAAC - SeanBailey
Mon Mar 28, 2022 11:26 am America/New_York
Forum: Questions/Comments
Question: R222 reprocessing schedule
Replies: 4

Re: R222 reprocessing schedule

Mati, There is no firm schedule, but a squishy one is as follows: S3A OLCI - soon-ish (maybe this week!) S3B OLCI - the week following S3A OLCI MODIS-Aqua - early May 2022? MODIS-Terra - the week after Aqua SNPP-VIIRS - late May/early June 2022? NOAA20-VIIRS - the week after SNPP-VIIRS OCTS, SeaWiFS...
by OB.DAAC - SeanBailey
Fri Mar 18, 2022 3:18 pm America/New_York
Forum: Questions/Comments
Question: Why Kd490?
Replies: 5

Re: Why Kd490?

The diffuse attenuation coefficient is useful for estimating light penetration depth (which in turn is useful in productivity models, and radiative heating estimates, as well as other applications). Early estimates of water absorption (e.g. Hale and Querry, 1973) put the minimum absorption around 49...
by OB.DAAC - SeanBailey
Thu Mar 17, 2022 2:48 pm America/New_York
Forum: Questions/Comments
Question: download using wget from http manifest
Replies: 1

Re: download using wget from http manifest

It seems that you requested the data be expired, so it was removed from our distribution servers. What you downloaded wasn't a manifest file, but the HTML error page (which was sent because the data no longer existed). You can check on the status of an order using the order manager (https://oceandat...