Search found 165 matches

by avmehta
Mon Feb 08, 2021 4:37 pm America/New_York
Forum: Questions/Comments
Question: MODIS 1640 nm band
Replies: 3

MODIS 1640 nm band

Thanks Don. But it is not so obvious in other bands -- just 1640 nm! Is that to be expected?
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Thanks.
Amita

by avmehta
Mon Feb 08, 2021 1:17 pm America/New_York
Forum: Questions/Comments
Question: MODIS 1640 nm band
Replies: 3

MODIS 1640 nm band

Hello, I am processing MODIS L1 to L2 at 1) 1 km and at 2) 250 m. Please see the attached images - in 1 km image I see stripes. In my par file I did not specify any resolution -- considering that 1 km would be default. Can you please help with this? https://oceancolor.gsfc.nasa.gov/forumdata/attach/...
by avmehta
Mon Feb 08, 2021 1:03 pm America/New_York
Forum: Questions/Comments
Question: gpt MosaicGeneral
Replies: 21

gpt MosaicGeneral

Thanks George.I am interested in just Rhos for all bands. If I did not specify PRODFAIL, according to you message it would it still exclude invalid pixels - correct?In my averaged image Rhos which are not valid show up as '0'. Is there a way to set them as NaN or other undefined value?Thanks...
by avmehta
Mon Feb 08, 2021 9:51 am America/New_York
Forum: Questions/Comments
Question: gpt MosaicGeneral
Replies: 21

gpt MosaicGeneral

Hello,      I have been able to mosaic several images using gpt. I already have reprojected files so I use them to mosaic multiple images. I have the following questions I need help with.     1) Is it OK to use reprojected files and l2flags (for criteria to mosaic) for ...
by avmehta
Sun Feb 07, 2021 9:30 am America/New_York
Forum: Questions/Comments
Question: gpt MosaicGeneral
Replies: 21

gpt MosaicGeneral

Thanks for reply George.
Initially I will not be merging images from MODIS and OLCI -  but merge them separately. I just looked at the link you sent -- great it explained what I was asking for!
Thanks a lot for your help.
Amita
by avmehta
Sat Feb 06, 2021 1:48 pm America/New_York
Forum: Questions/Comments
Question: gpt MosaicGeneral
Replies: 21

gpt MosaicGeneral

Hello,    I am trying to use gpt  MosaicGeneral to merge MODIS and OLCI images for each day. I have the following questions:     1)  It looks like this procedure will also reproject images. Or should I use gpt to reproject seperatly?     2) Can I use this...
by avmehta
Sun Jan 31, 2021 9:06 am America/New_York
Forum: Questions/Comments
Question: MODIS 250 m Rhos and Rrs
Replies: 2

MODIS 250 m Rhos and Rrs

Thank you so very much!
Amita
by avmehta
Sat Jan 30, 2021 6:54 pm America/New_York
Forum: Questions/Comments
Question: MODIS 250 m Rhos and Rrs
Replies: 2

MODIS 250 m Rhos and Rrs

Hello,   I started generating multiyear Aqua MODIS L2 data at 250 m resolution.  I see on https://oceancolor.gsfc.nasa.gov/docs/modis_hires/ that there are Hires  MODIS sensor variants (HMODISA and HMODIST) that l2gen uses! I do not see these options in GUI and not sure whether t...
by avmehta
Sat Jan 30, 2021 10:45 am America/New_York
Forum: Questions/Comments
Question: MODIS 250m Processing and Composite Images
Replies: 1

MODIS 250m Processing and Composite Images

Hello,  I was wondering if I can get some help on the following issue: We are trying to use Aqua-MODIS Rhos at 250m over the Chesapeake Bay for deriving algal bloom and hypoxia base on an AI algorithm. Because of the cloud cover a lot of pixels are unusable when colocating with in situ data....
by avmehta
Sun Dec 13, 2020 11:04 am America/New_York
Forum: Questions/Comments
Question: Ancillary Data for MODIS
Replies: 2

Ancillary Data for MODIS

Hello,  I am converting Aqua MODIS data from L1 to L2. For the atmospheric correction I get ancillary data using getanc.py.  Everything worked fine for years 2012 to 2020. But for 2011 I get the following errors: File "/usr/local/cb/ocssw/scripts/getanc.py", line 196, in <module>...