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Land discipline Visible Infrared Imaging Radiometer Suite (VIIRS) data products developed by the National Aeronautics and Space Administration (NASA) are made available from the Land Processes Distributed Active Archive Center (LP DAAC) as product development is completed. The LP DAAC will make future announcements as these operational data become available.
VIIRS is one of five instruments on-board the Suomi National Polar-orbiting Partnership (S-NPP) satellite launched from the Vandenberg Air Force Base on October 28, 2011, at 5:48 a.m. Eastern Daylight Time (EDT). S-NPP is the first in a series of four Joint Polar Satellite System (JPSS) satellites, a collaborative mission between the National Oceanic and Atmospheric Administration (NOAA) and NASA that will carry the VIIRS instrument.
VIIRS observes the entire Earth’s surface twice each day from NPP’s polar orbit 824 kilometers (km) (512 miles) above the Earth’s surface. The 3,000 km swath width of the VIIRS instrument, which is 710 km greater than that of Moderate Resolution Imaging Spectroradiometer (MODIS), allows for no gaps in coverage, similar to those observed in MODIS near the equator. The VIIRS instrument provides 22 spectral bands at two spatial resolutions, 375 meters (m) and 750 m, which are resampled to 500 m, 1 km, and 0.05 degrees in the NASA produced data products to promote consistency with the MODIS heritage.
LP DAAC distributes Land data processed to Level-2 or higher:
VIIRS filenames (i.e., the local granule ID) for Level 2G, Level 3, and Level 4 products follow a naming convention which provides useful information regarding the specific product. For example, the filename VNP09H1.A2014001.h08v05.001.2016012234657.h5 indicates:
The VIIRS Long Name (i.e., Collection-Level) convention also provides useful information. For example, all products belonging to the VIIRS/NPP Surface Reflectance 8-Day L3 Global 500m SIN Grid V001 collection have the following characteristics:
The higher level VIIRS Land products (e.g. Level 3 and Level 4) distributed from the LP DAAC will be produced at various temporal resolutions, based on the instrument's orbital cycle. The following time steps are possibilities for the generation of VIIRS Land products:
The VIIRS instruments acquire data in three native spatial resolutions:
The higher level VIIRS Land Products distributed from the LP DAAC are produced at three nominal spatial resolutions: 500 m, 1,000 m and 5,600 m (0.05 degrees) for Imagery bands I1-3 and Moderate bands M1-5, M7, M8, M10, M11.
The VIIRS tiling system is the same as the MODIS tiling system.
|I1||0.6 - 0.68||
|I2||0.85 - 0.88||Near IR|
|I3||1.58 - 1.64||Shortwave IR|
|I4||3.55 - 3.93||Medium-wave IR|
|I5||10.5 - 12.4||Longwave IR|
|M1||0.402 - 0.422||Visible/Reflective|
|M2||0.436 - 0.454||Visible/Reflective|
|M3||0.478 - 0.488||Visible/Reflective|
|M4||0.545 - 0.565||Visible/Reflective|
|M5||0.662 - 0.682||Visible/Reflective|
|M6||0.739 - 0.754||Near IR|
|M7||0.846 - 0.885||Near IR|
|M8||1.23 - 1.25||Shortwave IR|
|M9||1.371 - 1.386||Shortwave IR|
|M10||1.58 - 1.64||Shortwave IR|
|M11||2.23 - 2.28||Shortwave IR|
|M12||3.61 - 3.79||Medium-wave IR|
|M13||3.97 - 4.13||Medium-wave IR|
|M14||8.4 - 8.7||Longwave IR|
|M15||10.26 - 11.26||Longwave IR|
|M16||11.54 - 12.49||Longwave IR|
|DNB||0.5 - 0.9||Day/Night|
VIIRS products have two sources of metadata: the embedded HDF-EOS5 metadata, and the external ECS metadata. The HDF-EOS5 metadata contains valuable information including global attributes and dataset specific attributes pertaining to the granule. An external metadata file is provided in XML format (.xml) and is provided along with the VIIRS product. This file provides a subset of the HDF-EOS5 metadata. Some key features of certain VIIRS HDF-EOS5 metadata attributes include the following:
The dataset attributes contain specific Science Dataset (SDS) information such as the data range and applicable scaling factors for the data. Information for each NASA VIIRS Land data product can be found under the Dataset Discovery menu in the VIIRS Product Table.
An HDF-EOS5 file also contains information essential for NASA data access tools and services. Most software programs that can process standard HDF5 files can read an HDF-EOS5 file. However, it is difficult for a standard HDF5 call to interpret HDF-EOS5 geolocation or temporal information without further knowledge of the file structure.
Services for data access such as Data Pool, Reverb, and Earthdata Search Client can be found under Tools.
Certain open source tools and proprietary tools are available for use with VIIRS HDF-EOS5 products and are included in the following list:
Open Source Tools