Downloading VIIRS Active Fire Data
Updated 25 January 2013
The user community will find five primary options available to download Suomi‐NPP VIIRS (Visible Infrared Imager Radiometer Suite) Active Fire data.  The diagram on page 2 should help individuals choose their preferred method to access the data.  Step‐by‐step instructions are provided in the next pages. Users should find similar – if not identical – data content regardless of the provider accessed.  All distributed products listed below are based on the algorithm and processing code within the NOAA/NESDIS Interface Data Processing Segment (IDPS), therefore at this moment the NOAA/CLASS Data Archive System represents the official VIIRS data source. Small differences may exist among files downloaded from different sources due to unique processing systems, software sub‐versions, and data formats (e.g., 84sec versus 5min orbit segments) used. The range of selectable data acquisition dates will also vary depending on the data provider of your choice.
The baseline VIIRS active fire product is currently composed of vectors (1D) containing the list of latitude/longitude and corresponding image element
(line/sample) values of individual fire pixels detected. The data are distributed in HDF5 or HDF4 file form
ats. Users are encouraged to find the most appropriate software packages to open/read those files based on their own needs. Further enhancements to the VIIRS active fire detection product are being developed, including a fire detection mask (2D array) and radiative power (FRP) retrieval, mimicking the NASA MODIS Fire and Thermal Anomalies (MOD14/MYD14) product. Future updates to this document will be released as the new data sets become available.
The VIIRS active fire product maturity status is currently “Beta”. In short, the data are public however they are not science/application‐ready and may contain errors. The main intent is to allow users to become familiar with VIIRS data format and characteristics. Please see the following URL for more information on individual maturity levels and what they entail:
aa.gov/science‐maturity‐level.html
Additional information on the Beta status of the Active Fires product is available in the “readme” document on NOAA’s CLASS website:
v/notification/pdfs/VIIRS_Active%20Fire%20ARP_ Release_Readme_final.pdf
Users are referred to the VIIRS Active Fire Science Team dedicated URL for more information involving the active fire data set:
blaze.umd.edu/
Please use the “Contact  Us ” form for submitting questions and/or comments. Make sure to explore all the material posted on the website above as it may help answer most questions.
Other questions and/or issues concerning product performance, including reporting of data anomalies should be directed to:
Dr. Wilfrid Schroeder (wilfrid.v )
Dr. Louis Giglio (umd.edu )
Primary  VIIRS  Active  Fire  Data  Download  Options
truncated data
Figure  1: VIIRS Active Fire data access options.
*Ordering of spatial subsets indicates the option to select files that intersect a particular region of interest; data are delivered as full‐size swath tiles (~84sec or 5min orbit segments) without any resizing/subsetting being performed.  Order Spatial Subsets*
No
Order Daily Bundles No Order HDF5LAADS FTP          "/allData/3000"Order HDF4LAADS FTP            "/allData/3001"
Yes              (HDF5 only)
NOAA CLASS FTP
Yes
NOAA CLASS URL
(HDF5 only)LAADSWeb    URL (HDF4 & 5)
Option 1: NOAA CLASS Data Archive System (Web)
This should be your preferred option along with Option 2 when downloading data that must intersect a given spatial and temporal window and therefore requires user input. Files are delivered exclusively as ~5min tiles in HDF5 file format.
Step‐by‐step procedure:
(1)Open an internet browser and go to aa.gov/
(2)First, you must register (first‐time users) by clicking on the “Register” button
near the top of the page.  Enter your information and create a new user
account
(3)Login using your account information
(4)Click on the drop‐down bar labeled:
“Please select a product to search”
and select:
“NPP Visible/Infrared Imager/Radiometer Suite (VIIRS)”
then click on:
“Go”
(5)Choose spatial & temporal domains of interest
(6)On “Node”, select:
“Ascending” for daytime data
“Descending” for nighttime data
“Either” for both
(7)On “Satellite”, select:
“NPP”
(8)On “Datatype”, under “Application Related Product” select:
“VIIRS Active Fires ARP (public 05/03/2012)”
(9)Click “Search”
(10)On the new window containing the search results in tabular format,
check the boxes in the “Shopping Cart” column containing the files of interest or alternatively click the “Select All” button above the table, and then click the “Update” button also located above the table.  Note that you won’t be
automatically redirected.  In order to see you shopping cart, click on the
“Goto Cart” button above the table.
(11)In the shopping cart window, all selected files will be listed.  By
clicking on “Advanced Options” you will find additional options.  Note that
these do not apply to the Active Fire product but you may find it useful when
ordering other VIIRS data sets.  Note also that the active fire product is
distributed through the NOAA CLASS system as a ~5min (orbit segment) tile and HDF5 format only.  Different from other available VIIRS data sets, CLASS does NOT provide the de‐aggregate file version (i.e., 84sec tiles) for the
Active Fire product.
(12)Click on the “Place Order” button
(13)You will be notified via email once your order has been processed and
the files are ready for download
Additional data download options on next pages
Option 2: LAADSWeb Data Archive System (Web)
This should be your preferred option along with Option 1 when downloading data that must intersect a
given spatial and temporal window and therefore requires user input. Files are delivered as 84sec or 5min tiles, and in HDF5 (84sec) or HDF4 (5min) format. No user registration is required.
Step‐by‐step procedure:
(1)Open an internet browser and go to:
ladsweb.v/data/search.html
(2)Click on the drop‐down bar labeled:
“Satellite/Instrument”
and select:
“Suomi NPP/VIIRS”
(3)Click on the drop‐down bar labeled:
“Group”
and select for 84sec HDF5 files:
“NPP Level 2 Products”
and under “Products” list select:
“NP5_AVAF_L2 – HDF5 VIIRS Active Fire ARP”
or else select for 5min HDF4 files:
“NPP Level 2 5­Minute Products”
and under “Products” list select:
“NPP_AVAF_L2 – VIIRS/NPP Active Fires 5­Min L2 Swath ARP 750m”
(4)Define your temporal window of interest in the box labeled “Temporal
Selection” by clicking on the drop‐down bar labeled:
“Temporal Type”
and select the appropriate option
(5)In “Collection Selection” box, click on the drop‐down bar labeled:
“Collection”
and select:
“3000 – NPP VIIRS – IDPS Aggregation Chain” when ordering the 84sec HDF5 files above or else:
“3001 – NPP VIIRS – LandPEATE Products” when ordering the 5min HDF4
files above
(6)Define your spatial window of interest in the box labeled “Spatial Selection”
by clicking on the drop‐down bar labeled:
“Coordinate System”
and select the appropriate option
(7)In the “Coverage Selection” box select Day/Night/Both as appropriate.
(8)Click the “Search” button
(9) In the Search Results page that opens up, select files of interest and click “Add
Files to Shopping Cart” or else the “Order Files Now” button
(10)Enter your email as prompted and click on “Order”. You will be
notified via email once your order has been processed and the files are ready for download.

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