Forum

There is no difference. SMI is an acronym for Standard Mapped Image.

Tommy

Try this URL:
https://oceandata.sci.gsfc.nasa.gov/directdataaccess/Level-3%20Mapped/Aqua-MODIS/2009/263/

Tommy

The 8DAY and longer time period files are catalogued by the start date of the time period.

See for example:
https://oceandata.sci.gsfc.nasa.gov/directdataaccess/Level-3%20Binned/Aqua-MODIS/2021/001/

Tommy

The web developers are looking into the duplication in the browser results.

Tommy

Our current holdings:
MODISA | level0 | 2,084,721
MODIST | level0 | 2,320,268

Tommy

The NT data are the refined stream.
It isn't clear to me why ESA would reprocess a Near Real Time granule 4 days after real time.
They may have been testing something internally and published it by mistake.
I would ignore the NR granule.

Tommy

When you place your order, if you select "do not" extract my files, you will be presented with a list of URLs to download. That is where you can substitute GEO-M for L1A to get the GEO files. I passed your samoa question to our web admins.

Tommy

\

That is an extracted order. You can generate a geolocation file from the extracted L1A using SeaDAS.

See:
https://seadas.gsfc.nasa.gov/help-8.2.0/processors/ProcessGeolocate_viirs.html

Tommy

If you are not requesting regional extracts then you will get only the list of matching L1A file names returned,

That same list can then be used to get the GEO files by replacing the string "L1A" with "GEO-M" in the file name in the URL.

Tommy

We are working through an issue that is causing intermittent external database availability problems. That is likely the cause of your 404s.

Tommy