Search found 642 matches

by gnwiii
Fri Mar 17, 2017 3:45 am America/New_York
Forum: Questions/Comments
Question: Chlorophyll-A algorithm question
Replies: 5

Chlorophyll-A algorithm question

The factor of two comes from the double length of the path down and back up.  The simple exponential  formula gives a rough and ready approximation for the contribution from various depths, so Kd_490 can be used "for purposes of illustration".
by gnwiii
Thu Mar 16, 2017 9:29 am America/New_York
Forum: Questions/Comments
Question: viirsn processing after SeaDAS 7.4 upgrade
Replies: 13

viirsn processing after SeaDAS 7.4 upgrade

Thanks.  geolocate_viirs is working here.  I've been spoiled by all the helpful software that points out when options are missing or incorrect -- need to remember that such luxuries aren't always present.
by gnwiii
Thu Mar 16, 2017 7:23 am America/New_York
Forum: Questions/Comments
Question: Chlorophyll-A algorithm question
Replies: 5

Chlorophyll-A algorithm question

Roughly speaking, you get a weighted contribution from the underwater concentration.   The wavelengths used in chlor_a algorithms can penetrate many meters, but due to attenuation of the light on both downward and return paths, the contribution to Rrs is heavily weighted towards the surfac...
by gnwiii
Tue Mar 14, 2017 5:55 pm America/New_York
Forum: Questions/Comments
Question: SeaDAS 7.4 GUI issue on Centos 7
Replies: 2

SeaDAS 7.4 GUI issue on Centos 7

Try Oracle Java.  OpenJDK is known to have problems with graphics updating.
by gnwiii
Tue Mar 14, 2017 1:52 pm America/New_York
Forum: Questions/Comments
Question: MODISA Image Generation
Replies: 2

MODISA Image Generation

My personal approach to the issues you posed:1.  attaching a colorbara. GPT is generally used in batch processing to create lots of images, hopefully all with the same colour scale.  Rather than attaching a colour scale to each image, it often makes sense to keep it separate.  I often...
by gnwiii
Tue Mar 14, 2017 11:29 am America/New_York
Forum: Questions/Comments
Question: VIIRS L1A to L1B
Replies: 2

VIIRS L1A to L1B

Try using the full paths for the lines:dnb_dynamic_lut_file=<** missing path **>/VIIRS_NPP_CAL_DNB_DYNAMIC_LUT_v2.0.0.2_obpg.ncrsb_dynamic_lut_file=<** missing path **>/VIIRS_NPP_CAL_RSB_DYNAMIC_LUT_v2.0.0.2_obpg.ncI don't think the big dem files are needed if you use V*.GEO-M_SNPP.nc files, and...
by gnwiii
Tue Mar 14, 2017 8:44 am America/New_York
Forum: Questions/Comments
Question: viirsn processing after SeaDAS 7.4 upgrade
Replies: 13

viirsn processing after SeaDAS 7.4 upgrade

I get the same error on 2 different systems (macOS and linux).  Using "strace geolocate_viirs verbose=true ifile=V2017072153000.L1A_SNPP.nc" reveals that the problem is with "$OCDATAROOT/viirsn/dem//NPP_VIIRS_Terrain-Eco-ANC-Tile_N0722_v1.5.04.00_LP.teb".   I have ...
by gnwiii
Sun Mar 12, 2017 5:39 pm America/New_York
Forum: Questions/Comments
Question: viirsn processing after SeaDAS 7.4 upgrade
Replies: 13

viirsn processing after SeaDAS 7.4 upgrade

If you want to do VIIRS geolocation you need to install the files manually, see What is needed to geolocate NASA L1 VIIRS data?-SeaDAS 7 FAQ
by gnwiii
Sun Mar 12, 2017 1:20 pm America/New_York
Forum: Questions/Comments
Question: seadas-7.4 GUI java exception
Replies: 6

seadas-7.4 GUI java exception

The log shows "Caused by: java.awt.HeadlessException".  In plain language, this says Java didn't find keyboard, mouse, or display so is running in "headless" mode.
by gnwiii
Fri Mar 10, 2017 1:57 pm America/New_York
Forum: Questions/Comments
Question: viirsn processing after SeaDAS 7.4 upgrade
Replies: 13

viirsn processing after SeaDAS 7.4 upgrade

I have SeaDAS 7.4 on Linux Mint 18.1 (based on Ubuntu 16.04).  After running update_luts.py I also have the new $OCVARROOT/viirsn/cal/OPER/*_LUT_v2.0.0.2_obpg.nc files but ocssw/run/data/viirsn/instrument_defaults.par still has *_LUT_v1.1.0.1_obpg.nc.