Data Set
Four rain gauge networks were established in the vicinity
of the TOGA radar that is overlapped by the S-POL radar, and monitored from
December 1998 through March 1999, yielding this LBA subset of TRMM standard
product 2A56, rain gauge data in ascii.
Additional information about siting and operation of the rain gauge network
during LBA is available on the TRMM
Office campaign web site.
Data Characteristics
Files
| File type | File
format | Headers | # Files | Avg
File size | data set size |
|---|
| ASCII
text | Row/column | Yes | 115 | 65KB | 7.5MB | |
File names
The file naming convention for the TRMM 2A56 LBA subset is,
pppp_rrrr_nnn_ssss_yyyymm_v.asc
where, -
- pppp = product type
- rrrr = GV site
- nnn = gauge network
- ssss = gauge site number
- yyyy = year
- mm = month
- v = version
extension = "asc"
e.g. 2A56_TOGA_LBA_0001_199901_2.asc
Header Record
Each data file contains a 1 line header of the form
2A-56 TOGA LBA 0001 N2001 TIP 1.0 -10.76519 -62.13339 TOGA 23. 88. -99.9 01/03/1999 05:51 01/31/1999 19:30
Where,
|
| | 2A-56 | = product type |
| TOGA | = GV SITE |
| LBA | = Gauge Network |
| 0001 | = Gauge Number |
| N2001 | = Gauge Name |
| TIP | = Gauge Type (e.g. TIP = Tipping Bucket, DIS =
Distrometer) |
| 1.0 | = Data resolution (e.g. 1.0 = 1
minute) |
| -10.76519 | = latitude |
| -62.13339 | = longitude |
| TOGA | = Principle GV radar |
| 23. | = range from principle radar (km) |
| 88. | = azimuth relative to principle radar (0 ref =
North) |
| -99.9 | = elevation (meters; -99.9 = missing) |
| 01/03/1999 | = beginning date |
| 05:51 | = beginning time |
| 01/31/1999 | = ending date |
| 19:30 | = ending time |
Data Record
Data records have a variable number of lines as only non zero records are
written to file. They are of the form
95 02 12 43 14 16 00 4.75
Where,
-
- 95= year
- 02= month
- 12= day
- 43= Julian Day
- 14= hour
- 16= minute
- 00= second
- 4.75= rain rate (mm/hr)
Missing data value = -999.9 (represented by two contiguous records
delineating the begin and end date and time of period.
Suspect Data: -500 < value < 0 (Note that negative rain
rates are treated as suspect, but are always greater than special value
attached to missing data.)
Data Access and Contacts
You may retrieve the rain gauge files from this document or directly via ftp:
ftp disc2.nascom.nasa.gov
logon: anonymous
passwd: <your internet address>
cd data/TRMM/Ground_Instruments/gvgauge/BLBA/2A56
The principal investigator for the rain gauge data sets is
Brad Fisher
Code 910, Bld. 22 Room 368
NASA/Goddard Space Flight Center
Greenbelt, MD 20771
Phone: 301-286-8912
fax: 301-286 -1626
fisher@trmm.gsfc.nasa.gov
For information about LBA data archived at the Goddard DISC contact
Hydrology Data Support Team
GSFC DISC, Code 610.2
NASA/Goddard Space Flight Center
Greenbelt, MD 20771
phone: (301) 614-5165
fax: (301) 614-5268
hydrology-disc@listserv.gsfc.nasa.gov
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