TRMM Ground Validation (GV) Calibrated Radar Reflectivity Product (TRMM GV Product 1C51)
Entry ID:
GES_DISC_TRMM_1C51_V7
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Summary
Abstract:
The Tropical Rainfall Measuring Mission (TRMM) is a joint U.S.-Japan satellite mission to monitor tropical and subtropical precipitation and to estimate its associated latent heating. TRMM was successfully launched on November 27, 1997 at 4:27 PM (EST) from the Tanegashima Space Center in Japan. The purpose of the TRMM Ground Validation (GV) program is to develop validation methods and to obtain ... reliable surface-based data during the TRMM mission, with which the TRMM satellite measurements can be verified.
The TRMM GV network consists of four primary or direct data (DD) sites and seven direct product (DP) sites. The four DD sites are Darwin, Australia; Melbourne, Florida; Houston Texas; and Kwajalein. The seven DP sites are located in Taiwan, Israel, Thailand, Brazil, Guam, and special climatology-multiple radar sites in Florida and Texas.
TRMM_GV_1C51 represents quality controlled reflectivity fields of TRMM_GV_1B51. The algorithm removes non-meteorological radar echoes, such as clutter associated with insects, birds, chaff, wildfires, and anomalous propagation (AP), that adversely affect the quality of the higher level products. The design and implementation of the algorithm are discussed in Rosenfeld et al. (1995) and is described in more detail in the JCET home page (http://www.jcet.umbc.edu/). Eight adjustable parameters, three echo height thresholds, and five radar reflectivity thresholds are used to optimize the performance of the algorithm. Only volume scans with four or more tilt angles (full volumes) are retained from TRMM_GV_1B51. Every full volume is saved a half hour before or after the satellite passes over the site (satellite coincidence); otherwise, two full volumes are saved during non-coincidence, one full volume in the first half hour and another in the second half hour.
The data, storing multiple volume scans, are in the Hierarchical Data Format (HDF), which includes both core and product specific metadata. The file size is about 5 MB for Darwin and about 1 MB for the other sites (compressed). There are 24 files per day. 
Related URL
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Description:
Allow station searching.
Description:
This URL contains information and data access for all of the Goddard DAAC's hydrology data holdings, including TRMM data from the TMI, Precipitation Radar (PR) and Visible and Infrared Scanner (VIRS) instruments, the Ground Validation (GV) radar data, and ancillary and correlative data products.
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Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
Data Set Citation
Dataset Originator/Creator:
NASA, JAXA, Tropical Rainfall Measuring Mission Project (TRMM)
Dataset Title:
TRMM Ground Validation (GV) Calibrated Radar Reflectivity Product (TRMM GV Product 1C51)
Version:
7
Online Resource:
ftp://disc2.nascom.nasa.gov/data/s4pa/TRMM_GV_L1/
Data Resolution
Latitude Resolution:
2 km
Longitude Resolution:
2 km
Horizontal Resolution Range:
1 km - < 10 km or approximately .01 degree - < .09 degree
Vertical Resolution:
Surface
Temporal Resolution:
30 minutes
Temporal Resolution Range:
1 minute - < 1 hour
Quality
Data quality check and control are applied to generate the TRMM_GV_1C51 data. Each file has a quality control mask for both reflectivity and differential reflectivity. Data are truncated at 200 km (slant range). The quality control mask consists of values from -99 to 99, with -99 indicating a deletion and 99 indicating that the point needs no correction. Values from -10 to +10 in the quality control mask are corrections to the data and are mathematically added to the corresponding data values. No other values are valid. Also included is a table of correction factors, to be mathematically added to the appropriate fields, generally related to the radar platform.
Access Constraints
None
Data Set Progress
IN WORK
Distribution
Distribution Media:
Online (FTP)
Distribution Size:
average file size: 1924 KB
Distribution Format:
HDF
Fees:
none
Personnel
Role:
INVESTIGATOR
Phone:
(301)763-8000 x7290
Fax:
301)763-8545
Email:
brad.ferrier at noaa.gov
City:
Camp Springs
Province or State:
MD
Postal Code:
20705-2675
Country:
USA
Role:
TECHNICAL CONTACT
Phone:
(301) 614-5165
Fax:
(301) 614-5268
Email:
gsfc-help-disc at lists.nasa.gov
Contact Address:
Hydrology Data Support Team, Code 610.2
Goddard Space Flight Center
City:
Greenbelt
Province or State:
MD
Postal Code:
20771
Country:
USA
Role:
DIF AUTHOR
Phone:
(301) 614-5165
Fax:
(301) 614-5268
Email:
gsfc-help-disc at lists.nasa.gov
Contact Address:
Hydrology Data Support Team, Code 610.2
Goddard Space Flight Center
City:
Greenbelt
Province or State:
MD
Postal Code:
20771
Country:
USA
Publications/References
Interface Control Specification Between the Tropical Rainfall Measuring Mission Science Data and Information System (TSDIS) and the TSDIS Science User (TSU). Volume 3: File Specifications for TRMM products-Level 1. NASA Goddard Space Flight Center.
Rosenfeld, D., E. Amitai, and D. B. Wolff, 1995: "Classification of rain regimes by the three-dimensional properties of reflectivity fields," J. Appl. Meteor., 34, 198-211.
Creation and Review Dates
DIF Creation Date:
2011-07-19
Last DIF Revision Date:
2011-07-20
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