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SeaDAS 7.5 Release Notes
Release Date: May 9, 2018
The SeaDAS development team is pleased to announce the release of SeaDAS 7.5.
Highlights of what's new to SeaDAS 7.5 (GUI/GPT Aspect):
- OPBG Science Processing Code (OCSSW) support for Windows
- Statistics Tool: significant revision
- Reproject Tool: masking capabilities added
- CoastLandWater Tool: now available in GPT
- GPT Cookbook: contains command line usage examples
- Help: extensive rewrite of the Statistics and Reproject help pages
- OPBG Science Processing Code (OCSSW) support for Windows.
Windows users can access OBPG processing code from SeaDAS installed in Windows host machine.
* See https://github.com/seadas/seadas/blob/master/seadas-documents/manuals/SeaDAS-OCSSW-Client-Server-Configuration.md
- Statistics Tool
Major revision to this tool.
1. Revision (GUI)
a. Can be run simultaneously for multiple bands (no longer limited to a single band)
b. Regional and quality masking options
c. Bin count, and other binning parameters can be set. (Note: the related accuracy setting has been
removed. "Bin Width" field was previously named "Max Error")
d. More statistics fields added
e. Changed "Median" field to be a true calculation of the median. This field is optional since this
calculation can take longer on very large files. (Note: previously the median was a binned
calculation dependent on the bin size.)
f. A large number of metadata fields added such as Satellite, Platform, Resolution, Time and much more.
g. Convenient spreadsheet display added.
h. Plot formatting added.
i. Percentile plot is now percentile on y-axis and data on x-axis.
j. Some delayed screen repaint issue have been resolved.
k. Preferences page has been added.
2. Revision (GPT)
a. Adds the same statistics fields as the GUI (although does not add the metadata fields)
b. Uses bin count "numBins". (Note: the related accuracy setting has been removed.)
c. Added field "calculateMedian".
- Reproject Tool
1. Masking (both GUI and GPT)
Validation masking feature has been added.
Masks can now be applied to constrain which pixels of the source file are eligible for reprojection.
This feature also enables the user to deactivate the valid pixel expression of the source file and
carry the valid pixel expression over into the reprojected file.
2. Metadata (both GUI and GPT version)
Reproject tool specific metadata is now written to the output file.
3. Organization (GUI only)
Minor rewording of a few parameters and tabs of the GUI
- Navigation Tool Window (GUI)
1. Zoom all now behaves as a toggle between 100% zoom and 116% zoom for convenience of displaying gridlines
labels which are outside of the data window.
- Math Band Tool
1. Retain source data (GPT)
Option to transfer data from source file to output file. Previous version only created new bands
based on the source file data but did not retain the source file data.
- RGB Image Profiles (GUI)
1. A large amount of rgb configuration files (rgb_profiles) have been added. These include true color
and many false color configurations.
- Coast, Land, Water Tool (GPT) "LandWaterMask"
1. This is now fully supported and works in GPT mode. All GUI features have been added in as parameters
in the operator. Option to transfer data from source file to output file.
- Level 2 File reader
1. Mask "Quality_L3" revised
"HISATZEN" has been added to this mask composite to reflect the flags used in OBPG level3 processing.
- Time Series Tool - bands names were being naming based on local machine time zone, now they use UTC.
1. Statistics Tool (major revision)
The Statistics tool itself has been significantly revised and the help pages are updated accordingly
with a lot more detail about this tool.
2. Reproject Tool (major revision)
This is a major revision of this page. The information here can also be useful in understanding some
of the related map projection tools (Orthorectification, Mosaic and Collocate)
3. GPT Cookbook
Many examples of running the most common SeaDAS tools directly from the command line. These
examples feature the command line arguments along with the full contents of the graph files
and parameters files.
4. OCSSW Cookbook
Very new, so very few entries this release.
5. Menu organization
Adds a multitude of direct links to various internal help pages for ease of access within
the help menu. Adds many relevant web link to the help menu.
OBPG SCIENCE PROCESSING CODE
Since the v7.4 release there have been significant changes to the science processing code (OCSSW). Most of
these changes were centered around code restructuring and a reorganization of the static data directory.
There were also numerous minor bug fixes. In all, over 1700 commits were made to the development code repository!
Several key programs also had significant feature additions, including (but not limited to):
- changed latbin to a double to increase precision
- changed the "100m" resolution to a more appropriate "HQ"
- Add composite_scheme parameter to allow compositing by more than simple averages
- resolved a nagging memory issue related to an HDF5 compression leak
- added suite parameter
- Allow input of product to use for quality factor processing
- Additional GeoTIFF-capable projections
- Area weighting for Proj4 projections
- Apply fudge "factor" only when standard data point lookup fails
- Implemented LZW GeoTIFF compression
- added trimNSEW option to fill output when mapping non-rectangular projections
- reports an error for no pixels filled
- added support for Sentinel-2(A & B) MSI instrument
- added support for Landsat-8/OLI Collection 1 formatted data
- improved support for generic L1B input files
- removed terrain correction for OLCI files as geolocation data are already terrain corrected
- implemented a "smile" correction for OLCI
- If only VIIRS is installed then you need to either install MODIS Aqua or Terra (downloads a Gig of data)
or from command line do "update_luts.py aqua" or "update_luts.py terra".
- Multilevel_processor does not support: GOCI, OLI, and MERIS
Some of the help pages internal to SeaDAS 7.5 have not yet been revised to match the current version so there can be
some wording discrepancies as well as feature description differences. We also produce video help
tutorials <b>(https://seadas.gsfc.nasa.gov)</b>. In addition, we regularly respond to SeaDAS issues
on the our user forum
(https://oceancolor.gsfc.nasa.gov/forum/oceancolor/forum_show.pl). Questions posted on
the forum help aid us in determining aspects of SeaDAS which may benefit by refinement, as well as give us ideas
for topics to be used in future tutorial videos. Also note that these internal help pages are also made available at
If you already have SeaDAS version 7 or higher installed:
In your home directory there is a directory titled '.seadas'. This contains version-specific preferences
and defaults. This directory also contains any custom color palettes and rgb-profiles which you may have
created. Because of this, a seadas installation will automically move and rename the previous '.seadas'
directory putting it in your home directory. When seadas is launched and does not find this '.seadas'
directory, it will automically create this directory and initialize it with the package settings and defaults.
You can then manually copy any of your custom color palettes and rgb-profiles from the backed up copy
of your previous version's '.seadas' directory over into the '.seadas' directory.