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NASA Image Use Policy

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Wednesday, May 13, 2020
Permissions for using imagery found on this website are the same as those listed in NASA's official Media Usage Guidelines For questions about permission for using NASA images and videos, please refer to NASA's official Media Usage Guidelines. For any additional questions please contact bert.ulrich@nasa.gov A few key points of NASA's media usage policy include: NASA content (images, videos, audio, etc) are generally not copyrighted and may be used for educational or informational purposes without needing explicit permissions. The NASA insignia logo (the blue "meatball" insignia), the retired
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GPROF V05B Release Notes

Date Last Updated
April 17th, 2018
Document Description

GPROF V05 is the rainfall algorithm used in TRMM V8. It matches in all ways the algorithm from the retrieval for GPM GMI and other satellites in the constellation. The Goddard Profiling Algorithm is a Bayesian approach that nominally uses the GPM Combined algorithm to create it's a-priori databases. Given the importance of these databases to the final product, they are worth reviewing before discussing particular changes to the algorithm. GPROF V03 was implemented at the launch of the GPM mission and thus had no databases from the GPM satellite itself.

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GPROFV05B_releasenotes.pdf

Celebrating Earth Day with GPM

GPM Earth Day 2020 Banner
Wednesday, April 22, 2020
On April 22, 2020, people around the world will celebrate the 50th anniversary of Earth Day, embracing our commitment towards understanding the planet’s environmental processes and protecting it for future generations. In support of this global event, NASA is highlighting the agency’s contributions to the environment with a week of online events, stories, and resources.
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Test Article

GPM flying over Earth with a data swath visualized.
Wednesday, April 22, 2020
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What Determines the Latency of IMERG?

1. Most of the low-orbit microwave satellites downlink their data once or twice an orbit (which is about 90 minutes long) to the operating agency. [Except GMI comes down in 5-min. granules.] The agencies compute the Level 1B files, package them, and ship the data around. PPS gets all the NOAA and EUMETSAT data through NOAA, DMSP from NRL Monterey, and the Japanese AMSR2 through NASA, SAPHIR (now intermittently and generally not in near-real time) through ISRO, and GPM DPR and GMI within GPM.

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