Search found 135 matches

by OB WebDev - norman
Thu Mar 19, 2020 8:57 am America/New_York
Forum: Questions/Comments
Question: Size of 1 day level 2 data on global scale
Replies: 3

Size of 1 day level 2 data on global scale

Hi Eligio,You can get daily level-2 volumes by adding up the file sizes in bytesfrom pages like this representative Aqua/MODIS page from yesterday.https://oceandata.sci.gsfc.nasa.gov/MODIS-Aqua/L2/2020/078/If you are only interested in coastal regions, you will obviously haveless data to process....
by OB WebDev - norman
Tue Mar 03, 2020 10:13 am America/New_York
Forum: Questions/Comments
Question: Data Quality and need of Regional Algorithm
Replies: 6

Data Quality and need of Regional Algorithm

In addition to heavy suspended sediment load in the Bay of Bengal,the region also suffers from perennially bad air quality.  This negativelyaffects the accuracy of the MODIS atmospheric correction.I am afraid your reviewers are correct.  Ocean color remote sensingis difficult even over cle...
by OB WebDev - norman
Tue Jan 14, 2020 1:38 pm America/New_York
Forum: Questions/Comments
Question: modis-aqua adg_443_giop
Replies: 6

modis-aqua adg_443_giop

Hi Robert,I've been having some hallway conversations with folks whoknow a lot more about how our sausage is made than I do.The general thinking is that MODIS instrument calibrationis a never-ending process as the aging spacecraft is exposedto the ever changing space environment.  As one ge...
by OB WebDev - norman
Tue Jan 14, 2020 10:14 am America/New_York
Forum: Questions/Comments
Question: modis-aqua adg_443_giop
Replies: 6

modis-aqua adg_443_giop

Hi Robert,I was a bit more careful this time, and I do see what you are seeing.The following three images show differences between subsequent8-day 9km composites of adg_443_giop.  Red indicates that adg isgreater in the minuend, while blue shows areas where adg is greaterin the subtrahend. Whit...
by OB WebDev - norman
Mon Jan 13, 2020 5:06 pm America/New_York
Forum: Questions/Comments
Question: modis-aqua adg_443_giop
Replies: 6

modis-aqua adg_443_giop

Um, strike that image.  I just realized I didn't leave out the "no data" areas.
I'll have another look at this tomorrow, but if you could provide any additional
details in the mean time, that might help make sure I am looking in the
right place.

Norman
by OB WebDev - norman
Mon Jan 13, 2020 4:54 pm America/New_York
Forum: Questions/Comments
Question: modis-aqua adg_443_giop
Replies: 6

modis-aqua adg_443_giop

Hi Robert,I just computed the difference in the adg_443 values from these two files.A20193292019336.L3m_8D_IOP_adg_443_giop_4km.ncA20193372019344.L3m_8D_IOP_adg_443_giop_4km.ncI got a global field that looks like the attached image where red regions have higheradg in the first 8-day period and blue ...
by OB WebDev - norman
Mon Dec 09, 2019 12:02 pm America/New_York
Forum: Questions/Comments
Question: True Color
Replies: 2

True Color

I don't know what you consider high resolution, but the NASAEarthData folks have a WorldView browser that covers resolutionsdown to roughly 500-meter pixels.https://worldview.earthdata.nasa.gov/The Europeans have a browser for their Sentinel-2 data which have10-meter resolution.https://apps.sent...
by OB WebDev - norman
Thu Oct 31, 2019 8:53 am America/New_York
Forum: Questions/Comments
Question: Horizontal lines in MODIS Aqua data counts
Replies: 7

Horizontal lines in MODIS Aqua data counts

Hi Eligio,

As far as I am aware, we do not distribute SMI count files.
Which SMI files are you using?   If you want a proper image
showing the valid number of observations at any location,
then you should be using the L3 bin files as Don and George
suggested.

Regards,
Norman
by OB WebDev - norman
Wed Oct 30, 2019 9:08 am America/New_York
Forum: Questions/Comments
Question: L2gen process the estuary and coast have some problem
Replies: 16

L2gen process the estuary and coast have some problem

Hi,

MODIS data have a maximum resolution of 250 meters (at nadir,
for just two bands).  The resolution is limited by the hardware flying
in space.  Representing MODIS data at 30-meter resolution is just
creating data.

Regards,
Norman
by OB WebDev - norman
Thu Oct 24, 2019 10:37 am America/New_York
Forum: Questions/Comments
Question: getfile problem
Replies: 13

getfile problem

OK. Great.

Norman