Search found 141 matches

by OB WebDev - norman
Fri Jun 21, 2019 9:31 am America/New_York
Forum: Home
Question: log
Replies: 1

log

It's not SeaDAS, but you could use the standard linux program, bc, like this.cat <<EOF >sample_chl_anomalies.txt0.020.0142.40.260.0890.37EOFfor c in `cat sample_chl_anomalies.txt`; do  echo "l($c)" | bc -l >> log_sample_chl_anomalies.txtdoneOr you could use my favorite, reverse-po...
by OB WebDev - norman
Tue May 21, 2019 12:19 pm America/New_York
Forum: Home
Question: L2gen L1 Landsat 8 Processing for Inland Lake
Replies: 3

L2gen L1 Landsat 8 Processing for Inland Lake

One more short post script:

When working with Landsat 8 data, I have found that I can often make
a decent radiometric land mask for the scene in question by fiddling
with the contrast of the rhos_865 product from l2gen.

Norman
by OB WebDev - norman
Mon May 20, 2019 4:18 pm America/New_York
Forum: Home
Question: L2gen L1 Landsat 8 Processing for Inland Lake
Replies: 3

L2gen L1 Landsat 8 Processing for Inland Lake

Hi Amanda,The l2gen program does not change the projection of the Landsat 8 scenes duringprocessing.  The output pixels have the same universal transverse Mercatorcoordinates as the corresponding input pixels.  In addition, l2gen stores thelatitudes and longitudes of each pixel in separate...
by OB WebDev - norman
Mon May 20, 2019 10:39 am America/New_York
Forum: Home
Question: HICO data download
Replies: 5

HICO data download

Hi Mati,

Have you specifically registered to download HICO data?

https://oceancolor.gsfc.nasa.gov/registration/

If so, can you share a specific URL that is not working for you?

Regards,
Norman
by OB WebDev - norman
Mon Apr 29, 2019 9:13 am America/New_York
Forum: Home
Question: Eastern equatorial Pacific phytoplankton bloom image
Replies: 13

Eastern equatorial Pacific phytoplankton bloom image

If you haven't already, you might consider applying for the biennial ocean opticscourse held at the University of Maine in the summer.  This year's class is nowfilled, but this is probably one of the best introductions around for the field ofsatellite ocean color.  I am not an alum...
by OB WebDev - norman
Thu Apr 25, 2019 9:26 am America/New_York
Forum: Home
Question: Eastern equatorial Pacific phytoplankton bloom image
Replies: 13

Eastern equatorial Pacific phytoplankton bloom image

Hi Daniele,I assume you are referring to this image.https://oceancolor.gsfc.nasa.gov/feature/AnomalousEquatorialPacificBloom/A2007311222500.TropicalSouthPacificBloom.pngI made it while being paid by U.S. tax payers using a tax-payer-funded data set,so the image is in the public domain and free to be...
by OB WebDev - norman
Wed Apr 24, 2019 8:48 am America/New_York
Forum: Home
Question: Eastern equatorial Pacific phytoplankton bloom image
Replies: 13

Eastern equatorial Pacific phytoplankton bloom image

Hi Daniele,

Those gaps in coverage are places where no valid pixels were
recorded over the entire compositing period.  The primary cause
of this is persistent cloud cover, but other factors such as sun glint
or heavy aerosol can also sometimes play a role.

Regards,
Norman
by OB WebDev - norman
Tue Apr 23, 2019 11:07 am America/New_York
Forum: Home
Question: Eastern equatorial Pacific phytoplankton bloom image
Replies: 13

Eastern equatorial Pacific phytoplankton bloom image

Hi Daniele,

You forgot to add the attachment to your last post.

Norman
by OB WebDev - norman
Wed Apr 17, 2019 9:40 am America/New_York
Forum: Home
Question: Eastern equatorial Pacific phytoplankton bloom image
Replies: 13

Eastern equatorial Pacific phytoplankton bloom image

Hi Daniele,I make many of the images in the gallery that you refer to, but there are twofactors that you should be aware of regarding those images.  I, for the most part,choose scenes that are not overly cloudy and that  have relatively high levels ofphytoplankton biomass or other suspende...
by OB WebDev - norman
Mon Apr 08, 2019 9:53 am America/New_York
Forum: Home
Question: SeaWiFS. Estimate average chlorophyll
Replies: 9

SeaWiFS. Estimate average chlorophyll

Hi Daniele,It would probably be better to start a new topic on the forum fornew questions.Have you considered using imagery from our level-3 browser?The following is a recent example.https://oceancolor.gsfc.nasa.gov/showimages/VIIRS/IMAGES/CHL/L3/2019/041/V20190412019072.L3m_R32_SNPP_CHL_chl_ocx_4km...