NASA Goddard Space Flight Center, Goddard Earth Sciences Distributed Active Archive Center,Greenbelt, MD, 20771

1
GES DAAC Services and Tools for the Terra and
Aqua MODIS User Community
A. Gopalan, D. Nickless, D.Ouzounov,
A.Savtchenko, L. Pham, C. Lynnes, S. Berrick, Z.
Liu and H.Rui
http//disc.gsfc.nasa.gov
NASA Goddard Space Flight Center, Goddard Earth
Sciences Distributed Active Archive
Center,Greenbelt, MD, 20771
GDAAC SERVICES
Summary
Near-line Archive Data Mining (NADM)

• The aim of this poster is to inform the MODIS
  User Community about the newest Services and
  Tools available from the GDAAC. We also show
  examples (MOVAS) of the same that have resulted
  from collaborative partnerships with various
  groups here at GSFC and elsewhere.
• The Data Services are Applications that run on
  the GDAAC Systems and manipulate GDAAC data
• based on User demand.
• The Data Tools are Desktop Applications that
  Users will need to download along with Data and
  then
• execute them on their local systems.

MODIS L3 Atmospheric Products Online
Visualization and Analysis System (MOVAS)
GES DISC/DAAC is pleased to announce the GES DAAC
Data User Online Collaboration forums. These
Web-based forums have been set up to help you,
the Data User, interact and collaborate with
other Users and the DISC/DAAC on issues regarding
the Data we distribute. The URL to bookmark is
http//disc.gsfc.nasa.gov/forum/ MODIS User
Discussion Forum specifically for users of GES
DAAC MODIS data Data -gt Aerosol User Discussion
Forum specifically for users of GES DAAC aerosol
data.Data -gt Cloud - User Discussion Forum
specifically for users of GES DAAC cloud
data.Data -gt Ocean Color User Discussion Forum
specifically for users of GES DAAC ocean color
data.

• Easy to Use Web-based Tool (aerosol, water vapor
  and clouds, 1 x 1 degree, monthly,  April 2000 -
  present).
• Grid Analysis and Display System (GrADS) is used
  as a back-end engine for analysis.
• The basic functions of MOVAS consist of, area
  plot, time series, Hovmoller diagram, animation,
  ASCII output for all plot types (excluding
  animation), multiple ASCII output for time
  series, and multiple area plots. MOVAS is easy to
  use.
• MOVAS is the result of a Joint Collaboration
  between GES DAAC and AEROCENTER (GSFC Code 913)

GES DAAC SERVICES
GES DAAC DESKTOP TOOLS
Automated Subscriptions to any Data in the
Archive. Subsetting Services These include
On-demand Channel and Paremeter Subset,
On-the-Fly subsetting.
HDFLook-MODIS is a new, multifunctional, data
processing and visualization tool for Radiometric
and Geolocation, Atmosphere, Ocean, and Land
MODIS HDF-EOS data. Features include accessing
and visualization of all swath (Levels l and 2)
MODIS and AIRS products, and gridded (Levels 3
and 4) MODIS products re-mapping of swath data
to world map interactive and batch mode
capabilities subsetting and multi-granule
processing and data conversion.
MOVAS (MODIS L3 atmospheric data Online
Visualization and Analysis System) is designed
for quick exploration, analyses, and
visualization of MODIS Atmospheres Monthly
Level-3 product.
NADM (Near-line Archive Data Mining) give Users
the capability to upload, test their algorithms
and mine data from the GDAAC online cache.
SIMAP is an IDL-based script that is designed to
read and map MODIS Level 1B and Level 2 Ocean
and Atmosphere products. The resulting maps are
scaled to physical units (e.g., radiances,
concentrations, brightness temperatures etc.) and
saved in binary files. One of simap's strengths
is the composition of global maps, or the
stitching together of multiple L1B or L2 granules
on a single world map.
WebGIS is an online web software that implements
the Open GIS Consortium (OGC) standards for
mapping requests and rendering.
Content-based Services (Only for MODIS Direct
Broadcast Radiance Data)
Overview of GES DAAC Services and Tools
Functionality
Data Services Data Pool (Fast Online Disk
Cache) This consists (50 TB) Anonymous FTP area
where "fresh" data are made available on a
rotating basis. Its advantage is the ability for
users to directly download data of interest,
without having to submit an order. FTP Scripts
automatically generated by the System,
On- the-Fly Compression Capability can be used
to optimize Data transfer process.
http//daac.gsfc.nasa.gov/data/datapool/ Automat
ed Data Subscriptions (10 Gb Limit per
Subscription per Day) to any Data in the Archive.
Can Customized to various Data Attributes (e.g
Area of Interest). Suited to Users who require a
regular stream of Data over their Area of
Interest. Special arrangements with GDAAC are
necessary to use this Service. Please contact
(help_at_daac.gsfc.nasa.gov). Data Distribution
Options Electronic (FTP) Options include
FTPPULL (User will need to FTP Data staged on a
GDAAC FTPServer) and FTPPUSH (User FTP Server is
Configured to accept Data Transfer from GDAAC).
Distribution subject to Limit of 1000 Granules
per Order. http//daac.gsfc.nasa.gov/MODIS/FAQ/A_
max_size.shtml Hard Media Options include DVD
(GDAAC supplied Limit 95 per Year), 8mm Tapes
(GDAAC supplied Limit 65 per Year), DLT (GDAAC
supplied Limit 6 per Year). User will be
required to supply their own media if their Data
order exceeds above limits.
content-based subscription
calibratedradiance
Send only scenes where Lake Winnebago, Wisconsin
is visible
content-based subset
classifypixels

• Extract useful pixels, or
• Mask out useless pixels
• and compress

onlinecache
content-based cache management
Least-recently-used (LRU) algorithm is less
useful for very active caches. Content-based
caching applies simple heuristics to scene
content to (1) Retain scenes with more
useful/interesting pixels (2) Purge less useful
scenes quickly
SIMAP http//daac.gsfc.nasa.gov/MODIS/simap
DESKTOP TOOLS
MODIS Global Browse Images
SIMAP maps MODIS Level 1B, Level 2 Oceans and
Atmosphere Data

• It is an IDL code wrapped in an IDL batch file.
• It is a command-line utility and thus focuses on
  automatic production of mapped imagery.
• Platform independent
• Can be easily changed/expanded to fit user needs.
• Good for automatic production of unlimited number
  of mapped images.
• Features
• Mapping of MODIS L1B, Level 2 Oceans and
  Atmosphere using all available IDL Map
  projections.
• Uses either native L1B or MOD03 geolocation data.
• Detection and interpolation of invalid
  geolocations.
• Stitching of multiple granules in the map space.
• Converting to physical units.
• Automatically saves the map in image and binary
  format.
• The program is simple so that new modules can be
  added either in the source code, or in the batch
  file.
• The batch file design allows for inclusion in
  cron jobs, and shell or Perl scripts.

HDFLook-MODIS
HDFLook-MODIS is a result of joint collaboration
between LOA UST, France, and GES DAAC.
Features

• Multi granule processing Mosaic and Stitching
• Subsetting Channel, Parameter, Spatial
  Subsampling
• Data Conversion HDF-EOS to ASCII, Binary, JPEG
  and GeoTIFF
• Interactive, operational and batch mode All
  current capabilities are available in both
  interactive and command line modes
• AERONET data bank access Aerosol and other
  ancillary data are available from the ground
  based sun-photometer measurements (AERONET data
  bank).
• XWindows CE SGI and Linux

• Modular tool, easy to update, add new features
• Free to users obtaining it from DAAC
• HDF Data Compatibility All Land, Atmospheric and
  Ocean MODIS/Terra and MODIS/Aqua products, AIRS
  L1B and POLDER
• Mapping and Projections Geo-projection
  conversion for L2, L3, and L4 products
  LINEAR.GOODES, MOLLWEIDE, HAMMER, AZIMUTHAL,
  LAMBERT, MILLER, MOLLWEIDE, ORTHOGRAPHIC,
  SINUSOIDAL, VAN DER GRINTEN,WAGNER 7, ISIN,POLDER

MODIS/Terra Level 2 Local Scenes 5-minute
orbital swaths, 1 km (produced with SIMAP)
http//daac.gsfc.nasa.gov/MODIS/HDFLook/