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You are here: GES DISC Home Precipitation Documentation TRMM_README 1B21 Version 6 and Version 5 Quick Comparison

1B21 Version 6 and Version 5 Quick Comparison

1B21 Version 6 and Version 5 Quick Comparison


1B21 README     |     1B21 Data Access     |     1B21 Algorithm

1B21 File Format Quick Comparison
V6 SDS Array List V5 SDS Array List

      SDS Name              SDS Dimensions
      --------------------  ------------------
  1)  geolocation           9249     49      2 
  2)  systemNoise           9249     49 
  3)  sysNoiseWarnFlag      9249     49 
  4)  minEchoFlag           9249     49 
  5)  binStormHeight        9249     49      2 
  6)  binEllipsoid          9249     49 
  7)  binClutterFreeBottom  9249     49      2 
  8)  binDIDHmean           9249     49 
  9)  binDIDHtop            9249     49      2 
 10)  binDIDHbottom         9249     49      2 
 11)  scLocalZenith         9249     49 
 12)  scRange               9249     49 
 13)  osBinStart            9249     29      2 
 14)  landOceanFlag         9249     49 
 15)  surfWarnFlag          9249     49 
 16)  binSurfPeak           9249     49 
 17)  normalSample          9249     49    140 
 18)  osSurf                9249     29      5 
 19)  osRain                9249     11     28
     

      SDS Name              SDS Dimensions
      --------------------  -------------------
  1)  geolocation           9246     49      2 
  2)  systemNoise           9246     49 
  3)  sysNoiseWarnFlag      9246     49 
  4)  minEchoFlag           9246     49 
  5)  binStormHeight        9246     49      2 
  6)  binEllipsoid          9246     49 
  7)  binClutterFreeBottom  9246     49      2 
  8)  binDIDHmean           9246     49 
  9)  binDIDHtop            9246     49      2 
 10)  binDIDHbottom         9246     49      2 
 11)  scLocalZenith         9246     49 
 12)  scRange               9246     49 
 13)  osBinStart            9246     29      2 
 14)  landOceanFlag         9246     49 
 15)  surfWarnFlag          9246     49 
 16)  binSurfPeak           9246     49 
 17)  normalSample          9246     49    140 
 18)  osSurf                9246     29      5 
 19)  osRain                9246     11     28
       
V6 Vdata List V5 Vdata List

      Vdata Name        rec_num rec_size
      ----------------- ------- ---------
  1)  PR_CAL_COEF             1        72 
  2)  RAY_HEADER              9        60 
  3)  scan_time               9         8 
  4)  pr_scan_status          9        15 
  5)  pr_navigation           9        88 
  6)  powers                  9         6 
  7)  SwathStructure          1       482 
  8)  scan                    1         4 
  9)  scan                    1         4 
 10)  ray                     1         4 
 11)  ray                     9         4 
 12)  latlon                  1         4 
 13)  latlon                  2         4 
 14)  threshold               1         4 
 15)  threshold               2         4 
 16)  boxsize                 1         4 
 17)  boxsize                 2         4 
 18)  ray_os                  1         4 
 19)  ray_os                  9         4 
 20)  binstart_surtrack       1         4 
 21)  binstart_surtrack       2         4 
 22)  sample_norm             1         4 
 23)  sample_norm             0         4 
 24)  sample_surf             1         4 
 25)  sample_surf             5         4 
 26)  ray_os_rain             1         4 
 27)  ray_os_rain             1         4 
 28)  sample_rain             1         4 
 29)  sample_rain             8         4 
 30)  calibrated_nt           1         4 
 31)  calibrated_nt           1         4 
 32)  calibrated_nt           1         4 
 33)  calibrated_nt           1         4 
 34)  CoreMetadata.0          1      5668 
 35)  ArchiveMetadata.0       1      7964
          

      Vdata Name       rec_num rec_size
      ----------------- ------- ---------
  1)  PR_CAL_COEF             1        72 
  2)  RAY_HEADER             49        60 
  3)  scan_time            9246         8 
  4)  pr_scan_status       9246        15 
  5)  pr_navigation        9246        88 
  6)  powers               9246         6 
  7)  SwathStructure          1       482 
  8)  scan                    1         4 
  9)  scan                    1         4 
 10)  ray                     1         4 
 11)  ray                    49         4 
 12)  latlon                  1         4 
 13)  latlon                  2         4 
 14)  threshold               1         4 
 15)  threshold               2         4 
 16)  boxsize                 1         4 
 17)  boxsize                 2         4 
 18)  ray_os                  1         4 
 19)  ray_os                 29         4 
 20)  binstart_surtrack       1         4 
 21)  binstart_surtrack       2         4 
 22)  sample_norm             1         4 
 23)  sample_norm           140         4 
 24)  sample_surf             1         4 
 25)  sample_surf             5         4 
 26)  ray_os_rain             1         4 
 27)  ray_os_rain            11         4 
 28)  sample_rain             1         4 
 29)  sample_rain            28         4 
 30)  calibrated_nt           1         4 
 31)  calibrated_nt           1         4 
 32)  calibrated_nt           1         4 
 33)  calibrated_nt           1         4 
 34)  CoreMetadata.0          1      5669 
 35)  ArchiveMetadata.0       1      7968
          

Major Changes in 1B21 Algorithm for Product Version 6

  • For Land/Ocean Flag, added flag values for high attenuation.
  • Improvement of surface peak range bin number detection algorithm:   this routine is for the cases that the surface echo is fully attenuated by strong rainfall. In this case, surface peak is searched again using the output from clutter routine by Dr. Awaka. For the case of ocean, binSurfPeak is replaced by binEllipsoid.
  • Refurbishment of calibration table:   discontinuity between linear fitting part and parabolic fitting part should be corrected. Modification of calibration table in order to be applicable to the data around December 15, 1997, when the NASDA performed initial check out of PR by changing internal attenuation for various values.
  • Correction for a known error in the receiver calibration factor:   it should be about -1.0 dB instead of -0.65dB input for 1B21 .

Note: All above information is extracted from the following document: http://www.eorc.nasda.go.jp/TRMM/document/pr_manual/pr_manual_v6.pdf

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Last updated: Sep 18, 2009 10:32 AM ET
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