The actual breadth of the swath of Earth’s surface covered by each pass of VIIRS while the satellite circles the Earth is approximately 1,865 miles in length (about 3,001 kilometers).
- 1 What satellite is VIIRS?
- 2 How does the VIIRS sensor view the Earth at night?
- 3 How often is VIIRS updated?
- 4 What is a VIIRS hotspot?
- 5 Where can I buy VIIRS data?
- 6 What is the difference between MODIS and VIIRS?
- 7 What does MODIS stand for?
- 8 What does the Suomi NPP satellite do?
- 9 What is Aqua MODIS?
- 10 How often does the VIIRS satellite pass?
- 11 How does MODIS detect fire?
- 12 What are VIIRS fire alerts?
- 13 How accurate is MODIS?
- 14 How does MODIS work?
- 15 What is the spatial resolution of Viirs?
What satellite is VIIRS?
It is currently operating as part of the Suomi NPP satellite mission, and it generates a wide range of critical environmental products, including information on snow and ice cover; clouds; fog; aerosols; fires; smoke plumes; dust; vegetation health; phytoplankton abundance and chlorophyll; and vegetation health. VIIRS will also be on the JPSS-1 and JPSS-2 satellite missions, as well as on other missions.
How does the VIIRS sensor view the Earth at night?
The VIIRS is not the first device to seek for signs of life in the night sky. In addition, the new VIIRS day-night band has improved detection and resolution of Earth’s night lights; it is sensitive enough to detect lights as small as a single street lamp and even the nighttime glow created by the Earth’s own atmosphere, according to NASA.
How often is VIIRS updated?
The VIIRS sensor on the Suomi-NPP and NOAA-20 satellites collects data on a continuous basis, according to the company. VIIRS’s sweep of 3,040 kilometers allows for a maximum of 15 percent picture overlap between consecutive orbits at the same latitude, resulting in complete world coverage every 12 hours.
What is a VIIRS hotspot?
The VIIRS Thermal Hotspots and Fire Activity product is a product of NASA’s Land, Atmosphere, and Space Science Division. NASA’s Near-real-time Capability for Earth Observation Data (LANCE) is a component of the Earth Science Data program. It may be used to follow the location of fires that have occurred in the recent past, anywhere from a few hours to seven days after they occurred in real time.
Where can I buy VIIRS data?
To access VIIRS NRT data, you must first create an Earthdata Login account. A suite of radiometers for visible and infrared imaging (VIIRS)
- For direct access to VIIRS-Land data, go to: VIIRS-Land-NRT1. For programmed or automated downloads, go to: VIIRS-Land-NRT1. Subscribe to or unsubscribe from the LANCE-MODIS/ VIIRS email list at any time. Leave the topic and body sections blank.
What is the difference between MODIS and VIIRS?
While using the MODIS thermal band, hot spots can be detected with a resolution of 1,000 meters per pixel; when using the VIIRS thermal band, hot spots may be detected with a resolution of 375 meters per pixel. Thus, VIIRS can produce fire observations that are approximately three times more detailed than those made by MODIS.
What does MODIS stand for?
A significant sensor on board the Terra (originally known as EOS AM-1) and Aqua (formerly known as EOS PM-1) satellites is the MODIS (or Moderate Resolution Imaging Spectroradiometer), which was developed by the European Space Agency.
What does the Suomi NPP satellite do?
A suite of radiometers for visible and infrared imaging (VIIRS) Land, atmosphere, ice, and ocean radiometric imagery are collected in visible and infrared wavelengths using the satellite’s radiometric imaging system.
What is Aqua MODIS?
Terra (EOS AM) and Aqua (EOS PM) satellites both carry the Moderate Resolution Imaging Spectroradiometer (MODIS), which is a critical sensor on board. In the morning, Terra’s orbit around the Earth is scheduled so that it travels from north to south over the equator, whereas Aqua’s orbit around the Earth is set so that it crosses from south to north across the equator in the afternoon.
How often does the VIIRS satellite pass?
A total of two MODIS and one VIIRS satellites make two flights over the Earth every 24 hours – one during the day and one at night – and collect data. Because of the overlap at mid-latitudes, this translates to seven to eight passes every day on average.
How does MODIS detect fire?
Products for Burned Areas from MODIS At 500m, it identifies the occurrence of fast variations in daily surface reflectance time series data, which may be used to estimate the approximate date of the burning. The technique maps the spatial extent of current fires, rather than the spatial extent of fires that happened in earlier seasons or years, according to the data.
What are VIIRS fire alerts?
Active fires detected by VIIRS are more numerous and have greater resolution than active fires detected by MODIS. Data about Global Forest Watch and Global Forest Watch Fires is now available on the internet.
How accurate is MODIS?
At nadir, the MODIS Land Science Team requires a geolocation accuracy of 150 m (1 kilometer), with an operating aim of 50 m (1 kilometer) in order to be effective (Nishihama et al., 1997). The design of the MODIS geolocation algorithm and error analysis technique is guided by the accuracy requirement and purpose stated above.
How does MODIS work?
MODIS is a comprehensive program that makes use of sensors on two satellites that each give daily coverage of the whole planet. The data are available at a number of different resolutions, including spectral, spatial, and temporal. Night-time statistics are also accessible in the thermal spectrum, which includes the visible spectrum.
What is the spatial resolution of Viirs?
For the VIIRS instrument, 22 spectral bands ranging from 412 nanometers (nm) to 12 micrometers (micrometers) are available at two spatial resolutions, 375 meters (m) and 750 meters (m), which are resampled to 500 meters (m), one kilometer (km), and 0.05 degrees in the NASA-produced data products to maintain consistency with the MODIS legacy.