Learn more. IEEE Transactions on Geoscience and Remote Sensing. Generating Global Products of LAI and FPAR From SNPP-VIIRS Data: Theoretical Background and Implementation. Lunar Calibration and Performance for S-NPP VIIRS Reflective Solar Bands. The largest difference, about 1%, occurs in band M1. • Wide enough to prevent data gaps near the Equator (c.f. “These maps of city lights could be valuable for government agencies gauging and optimizing power usage, or even for businesses that may want to project future sales of holiday lights,” said Jeff Puschell, principal engineering fellow at Raytheon.
Generally, the TEB performance is very stable. Because of their "around the Earth" orbit and ability to cover the entire globe every 14 hours, polar satellites give meteorologists detailed information on severe weather events that no other instrumentation can.
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. The trending of major key parameters, such as the F factor, the signal to noise ratio, and temperature, has been performed continuously and has always been within expectations. As described in section 4, relative F factors for the RSB can be derived from regularly scheduled lunar observations. Surface Roughness-Induced Spectral Degradation of Multi-Spaceborne Solar Diffusers Due to Space Radiation Exposure. The product of the SD BRDF and SAS transmission (RTA view, averaged over all detectors) was derived on orbit from yaw maneuver data as a function of solar declination and azimuth angles. The timeline of all maneuvers and other major operation events and calibration activities are listed in Table 3.
It is monitored by six embedded thermistors traceable to National Institute of Standards and Technology and protected by a shield plate from stray light.
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f�ԉd�9�@6_IjH��9���(3=�D����R�1%? The 750 m product, most importantly, provides continuity with the Earth Observing System (EOS) Moderate Resolution Imaging Spectroradiometer (MODIS) 1 km product.
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, as observed in MODIS near the equator. 2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS). These enhancements have been applied to the operational SDR production. Small time periods of BB WUCD, spacecraft anomaly, and instrument safe mode are excluded from this trending. (a) TEB band averaged RVS for HAM side A derived from the pitch maneuver. VIIRS observes the entire Earth’s surface twice each day with an equator crossing time of approximately 1:30 a.m. and 1:30 p.m. local time from NPP’s polar orbit 824 kilometers (km) (512 miles) above the Earth’s surface. As a result, the TEB relative RVSEV can be derived from TEB detector's EV response to the deep space [Wu et al., 2012]. However, it is difficult for a standard HDF5 call to interpret HDF-EOS5 geolocation or temporal information without further knowledge of the file structure. Note that the SD screen may cause small nonuniformity in detector responses.
The dual gain bands are set to fixed high gain during scheduled lunar observations [Sun et al., 2012]. Next, the derived SD BRDF and SAS transmission product (SDSM SD view) is used to determine the SDSM solar screen transmission from the H factor equation. It is clear that a dedicated calibration effort remains the key to the mission success. Geophysics, Geomagnetism MODIS and VIIRS Calibration and Characterization in Support of Producing Long-Term High-Quality Data Products. Green shading marks areas where light usage increased in December, compared to the rest of the year. Journal of Advances
Learn about our remote access options, Sciences and Exploration Directorate, NASA/GSFC, Greenbelt, Maryland, USA, E-mail address: Xiaoxiong.Xiong‐1@nasa.gov, Sigma Space Corporation, Lanham, Maryland, USA. The main source of random error is the EV dn noise, quantified by the SNR at LTYP. SNPP VIIRS RSB on-orbit radiometric calibration algorithms Version 2.0 and the performances, part 2: the performances. VIIRS day/night band radiometric calibration stability monitoring using the Moon. For comparison purposes, the lunar results are also presented as symbols in Figure 6. It should be noted that the product of SD BRDF and SAS transmission derived from the yaw data is currently used to calculate the F factors for each spectral band. Investigating multiple aerosol optical depth products from MODIS and VIIRS over Asia: Evaluation, comparison, and merging. Section 3 briefly describes sensor on‐orbit calibration methodologies and lunar calibration strategies. Sensors, Systems, and Next-Generation Satellites XXII. To assure sensor on‐orbit calibration and data quality, the VIIRS instrument carries a set of onboard calibrators (OBCs), designed and improved based on the experience and lessons from MODIS, which include a solar diffuser (SD) and a solar diffuser stability monitor (SDSM) primarily used for the RSB calibration and a blackbody (BB) for the TEB. On‐orbit results of VIIRS SNR for RSB and NEdT for TEB are summarized in Table 1. VIIRS sensors orbit the planet aboard two National Oceanic and Atmospheric Administration satellites, providing not only a view of holiday lights, but also critical environmental and weather data. Modernization, Training & Mission Support. In addition, the differences tend to increase with decreasing SDSM azimuth angle for the higher number detectors and the opposite for lower number detectors. The Visible Infrared Imaging Radiometer Suite (VIIRS) is one of the key instruments onboard the Suomi National Polar-Orbiting Partnership (Suomi NPP) spacecraft, which was successfully launched on October 28, 2011. Capitalizing on the success of Suomi NPP, the JPSS-1 … The instrument temperatures, including seasonal variations, for the scan cavity and warm FPA (VIS and NIR) have been stable to within ±1.0 K. The variations of the CFPA and BB temperatures, including their drifts over time, have been of less than 20 mK and 5 mK, respectively. The difference is most visible in rural and suburban areas, rather than in big cities like New York or Los Angeles, which are typically brighter anyway. Fire data is available for download or can be viewed through a map interface. Impact of Blackbody Warm-Up Cool-Down Cycle on the Calibration of Aqua MODIS and S-NPP VIIRS Thermal Emissive Bands. The SD SAS transmission function (τSAS) and SD BRDF are key parameters used to compute RSB on‐orbit calibration coefficients. This file provides a subset of the HDF-EOS5 metadata. This paper provides an overview of VIIRS OBC functions as well as its on‐orbit operation and calibration activities. Shortly after launch, VIIRS successfully carried out a series of instrument tests and characterization activities to verify its space environment operations and various OBC functions as well as to evaluate and verify its on‐orbit performance. Please check your email for instructions on resetting your password. There is a small distinct offset of about 15 mK in the BB temperature trending. VIIRS instrument cavity, VIS/NIR FPA, and HAM temperatures (daily averaged). The trending starts from day 86 (21 January 2012) when the CFPA temperatures stabilized after opening the cooler door. Objects, Solid Surface Right before the dip, the spacecraft was briefly in Sun Point mode, resulting in the spacecraft control computer reset likely due to overheating.
Monitoring the VIIRS Sensor Data Records Reflective Solar Band Calibrations Using DCC With Collocated CrIS Measurements. Including all the factors mentioned above, our best estimation of the SDR reflectance uncertainties at LTYP are 1.2% for bands M1–M7, 1.3% for bands I1 and I2, 1.4% for band M10, 1.5% for bands M8 and M9, 1.6% for band I3, and 4.9% for band M11.
Both the S/MWIR and LWIR FPAs are cooled and nominally controlled at 80 K via a passive cryoradiator. Geophysics, Marine The SD bidirectional distribution function (BRDF) was characterized prelaunch and its on‐orbit degradation is monitored by the SDSM. (1896-1977), Chinese Journal of Geophysics (2000-2018), International H�\��j�@���\��%�y?D�ڂ���{����CL���'O�� 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. In the interim, we are building on existing regional fire networks to assess the VIIRS fire algorithm performance.
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