TRMM_3B42_Daily: TRMM (TMPA) Precipitation L3 1 day 0.25 degree x 0.25 degree, V7

Daily TRMM 3B42 rainfall data 0.25x025 lat/lon grid, V7

This daily accumulated precipitation product is generated from the research-quality 3-hourly TRMM Multi-Satellite Precipitation Analysis TMPA (3B42). It is produced at the NASA GES DISC, as a value added product. Simple summation of valid retrievals in a grid cell is applied for the data day. The result is given in (mm). The beginning and ending time for every daily granule are listed in the file global attributes, and are taken correspondingly from the first and the last 3-hourly granules participating in the aggregation. Thus the time period covered by one daily granule amounts to 24 hours, which can be inspected in the file global attributes.
Counts of valid retrievals for the day are provided for every variable, making it possible to compute conditional and unconditional mean precipitation for grid cells where less than 8 retrievals for the day are available.
The information provided here on the TRMM mission, and on the original 3-hr 3B42 product, remain relevant for this derived product. The daily accumulation is derived by summing *valid* retrievals in a grid cell for the data day. Since the 3-hourly source data are in mm/hr, a factor of 3 is applied to the sum.

Note: The multi-satellite 3B42* / TMPA / TMPA-RT products ended on December 31, 2019. GPM IMERG dataset now includes TRMM-era data going back to June 2000, and is now the recommended multi-satellite dataset to use for most purposes.

For more details of the derivation, go to https://disc.gsfc.nasa.gov/datasets/TRMM_3B42_Daily_7/summary

To cite the data in publications:
Goddard Earth Sciences Data and Information Services Center (2016), TRMM (TMPA) Precipitation L3 1 day 0.25 degree x 0.25 degree V7, Edited by Andrey Savtchenko, , Goddard Earth Sciences Data and Information Services Center (GES DISC), Accessed: [Data Access Date], doi:10.5067/TRMM/TMPA/DAY/7

References:
Huffman, G.J. (1997), Estimates of Root-Mean-Square Random Error for Finite Samples of Estimated Precipitation, J. Appl. Meteor.
Huffman, G.J., R.F. Adler, D.T. Bolvin, G. Gu, E.J. Nelkin, K.P. Bowman, Y. Hong, E.F. Stocker, D.B. Wolff (2007), The TRMM Multi-satellite Precipitation Analysis: Quasi- Global, Multi-Year, Combined-Sensor Precipitation Estimates at Fine Scale., J. Hydrometeor
Huffman, G.J., R.F. Adler, D.T. Bolvin, E.J. Nelkin (2010), The TRMM Multi-satellite Precipitation Analysis (TMPA). Chapter 1 in Satellite Rainfall Applications for Surface Hydrology, doi:10.1007/978-90-481-2915-7

Variables
rainfall (mm)
ZonalGlobal by 0.25 deg
Meridional50S to 50N by 0.25 deg
Vertical 
Temporal V7: Jan 1, 1998 to Dec 30 2019 by 1 day(s)
The daily definition is (03Z – 00Z)
Static? yes
Volume 2.3MB / day
Serverpublic:
Source https://disc.gsfc.nasa.gov/datasets/TRMM_3B42_Daily_7/summary
Acquired July 20, 2016 (V7: Updated Mar 2020)
APDRC contact /
Supplements README.TRMM_V7.pdf