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What is a DAAC? The Distributed Active Archive Centers (DAACs) are part of NASA's Earth Observing System Data and Information System (EOSDIS). Each of the twelve data centers serves one or more specific Earth science disciplines and provides its user community with data products, data information, u...

What is Common Metadata Repository? CMR is a high-performance, high-quality, continuously evolving metadata system that catalogs all data and service metadata records for NASA's Earth Observing System Data and Information System (EOSDIS) system and will be the authoritative management system for al...

NASA Earth Science Data Systems Web Unification Frequently Asked Questions Why is this project occurring? The purpose of the project is driven by the 21st Century Integrated Digital Experience Act (IDEA) that was signed into law in 2018. The Act requires all agencies in the executive branch to make...

Imagery Use and Citation Information NASA supports full and open sharing of data and we encourage publication of imagery from Worldview Snapshots; when doing so for image captions, please cite it as "NASA Worldview Snapshots" and also consider including a direct link to the imagery in Wor...

What is the maximum image size/dimension that I can download?

The maximum image size/dimension you can download is 8200 x 8200 pixels.

What do the different band combinations mean for the corrected reflectance images? A digital color image displayed on a monitor is composed of three different color channels: red, green, and blue. The Corrected Reflectance satellite images from MODIS and VIIRS are made by combining the reflected li...

Fires When you select Fires as your overlay layer, it will match the corresponding fire layer to the base layer you have picked. These are available approximately 3 hours after satellite observation. Terra/MODIS Corrected Reflectance layers: Terra/MODIS Fires and Thermal Anomalies (Day and Night) l...

There are 22 available imagery layers from the Moderate Resolution Imaging Spectroradiometer ( MODIS ) instrument aboard NASA's Terra and Aqua satellites, the Visible Infrared Imaging Radiometer Suite ( VIIRS ) instrument aboard the joint NASA/NOAA Suomi National Polar-orbiting Partnership ( Suomi N...

What is VIIRS? The VIIRS pixel footprint size projected onto the Earth increases away from nadir. VIIRS stands for Visible Infrared Imaging Radiometer Suite (VIIRS). The VIIRS sensor was launched aboard the joint NASA/NOAA Suomi National Polar-orbiting Partnership ( Suomi NPP ) satellite on October...

MODIS Near Real-Time Data What is MODIS? MODIS stands for Moderate Resolution Imaging Spectroradiometer. The MODIS instrument is aboard the Earth Observing System (EOS) Terra (EOS AM) and Aqua (EOS PM) satellites. The orbit of the Terra satellite goes from north to south across the equator in the mo...