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GPM/DPR Level 2 Algorithm Theoretical Basis Document (ATBD)

Date Last Updated
December 17th, 2021
Document Description

This document describes the basic idea of DPR data processing. It was originally written for the algorithm used in the at-launch version (V03). The algorithm has been modified and improved since then. Although the basic idea of data processing remains the same, the actual flow of processing, in particular that in the solver module, has changed substantially. As a result, some part of description in Section 3.1 may not be relevant any more.

File Downloads
ATBD_DPR_V07A.pdf

GPM: Chapter 6 from "Precipitation: Advances in Measurement, Estimation, and Prediction"

Document Description

Observations of the space-time variability of precipitation around the globe are imperative for understanding how climate change affects the global energy and water cycle (GWEC) in terms of changes in regional precipitation characteristics (type, frequency, intensity), as well as extreme hydrologic events, such as floods and droughts. The GWEC is driven by a host of complex processes and interactions, many of which are not yet well understood. Precipitation, which converts atmospheric water vapor into rain and snow, is a central element of the GWEC.

PMM Science Team Login Page

GPM flying over Earth with a data swath visualized.
Tuesday, May 17, 2011
Coming Soon! This page will allow you to log into the PMM Science Team Portal to collaborate with your fellow scientists. Some of the features we are planning include: The ability to create personal profiles and view the profiles of your teammates. A wiki / forum for communication and sharing of ideas. A tool to schedule meetings with your fellow scientists. A tool for sharing documents and files. Check back here for updates on the status of this tool.
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RSS Feeds

GPM flying over Earth with a data swath visualized.
Monday, May 16, 2011
Precipitation Measurement Missions - All Provides updates to all PMM website content, including GPM, TRMM, and Ground Validation missions. GPM Provides updates for all GPM-related articles, mission updates, multimedia, and other content. TRMM Provides updates for all TRMM-related articles, mission updates, multimedia, and other content. NEW! GCPEx Campaign Blog Updates from the GPM Cold-season Precipitation Experiment (GCPEx). Learn more about GCPEx.
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Related Sites

GPM flying over Earth with a data swath visualized.
Monday, May 16, 2011
GPM on www.nasa.gov The official mission page of the Global Precipitation Measurement (GPM) mission on www.nasa.gov. GPM Goddard Multimedia Download high resolution videos and animations that were produced by the GPM team. NASA Goddard Space Flight Center The GPM Core Observatory was assembled and tested at NASA's Goddard Space Flight Center in Greenbelt Maryland. Goddard is home to the nation's largest organization of combined scientists, engineers and technologists that build spacecraft, instruments and new technology to study the Earth, the sun, our solar system, and the universe. Named for...
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Problem-Based Classroom Modules

GPM flying over Earth with a data swath visualized.
Tuesday, March 15, 2011
(grades 5-8) (grades 5-8) (grades 5-8) (grades 5-8) (grades 9-12)
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A First Approach to Global Runoff Simulation using Satellite Rainfall Estimation

Document Description
Motivated by the recent increasing availability of global remote sensing data for estimating precipitation and describing land surface characteristics, this note reports an approximate assessment of quasi-global runoff computed by incorporating satellite rainfall data and other remote sensing products in a relatively simple rainfall-runoff simulation approach: the Natural Resources Conservation Service (NRCS) runoff curve number (CN) method.

The Shape of a Raindrop

Diagram of raindrop shape
Monday, March 7, 2011
High in the atmosphere, water collects on dust and smoke particles in clouds. Raindrops start to form in a roughly spherical structure due to the surface tension of water. This surface tension is the "skin" of a body of water that makes the molecules stick together. The cause is the weak hydrogen bonds that occur between water molecules. On smaller raindrops, the surface tension is stronger than in larger drops. The reason is the flow of air around the drop. As the raindrop falls, it lose that rounded shape. The raindrop becomes more like the top half of a hamburger bun. Flattened on the...
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Students and Educators

GPM flying over Earth with a data swath visualized.
Monday, March 7, 2011
Problem-Based Classroom Modules A series of PDF files which provide full classroom lessons and problem sets for a number of precipitation-related topics. The Shape of a Raindrop A lesson on what causes raindrops in our atmosphere to be a certain shape. Create a Sphere with Precipitation Climatology Click above to download the PDF file. This is an activity in which students will cut and fold paper to create a 3D sphere which displays the precipitation climatology (long-term average) computed by the Global Energy and Water Experiment for 1979-2008. This activity was created by Dr. Chris Kidd and...
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2DVD at Egbert, CARE, Canada

Document Description

Presentation of CSU's 2-Dimensional Video Disdrometer for the Canadian CloudSat/CALIPSO Validation Programme

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