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GPM

Overview

  • Ku band (13.6 GHz) ... similar to TRMM/PR (13.796 GHz and 13.802 GHz). for strong rain. Swath 245 km. N66.28deg~S66.30deg.
  • Ka band (35.5 GHz) ... no band in TRMM/PR. for weak rain and snow. Swath 125 km
    • after 2018/05/21, Ka band will cover entire swath (245 km)
    • local zenith angle (degree) of HS: 8.62, 7.86, 7.11, 6.36, 5.60, 4.85, 4.09, 3.34, 2.58, 1.83, 1.07, 0.32, 0.44, 1.19, 1.95, 2.70, 3.46, 4.21, 4.97, 5.72, 6.48, 7.23, 7.99, 8.74
    • local zenith angle (degree) of MS: 9.00, 8.24, 7.49, 6.73, 5.98, 5.22, 4.47, 3.71, 2.96, 2.20, 1.45, 0.69, 0.06, 0.82, 1.57, 2.32, 3.08, 3.83, 4.59, 5.34, 6.10, 6.85, 7.61, 8.37, 9.12

products

  • GPM KuPR L2 Precipitation, V5A or V5B
  • V05A: upto 2018/05/21 0138_0311_024011
  • V06A: since 2018/05/21 1704_1837_024021

G-Portal (2019/01/16)

V04A  2014~2017/05
V05A  2014-2018/05
V05B  2018/05-
V06A  2014/03-06, 2018/09-

Download

You can download data from G-portal of JAXA. Use sftp to get large number of files! (see details)

$ sftp -oPort=2051 [user account]@ftp.gportal.jaxa.jp 
> mget standard/GPM/GPM.DPR/2A.Ku/05A/2018/??/??/*h5

filename rule

example: GPMCOR_KUR_1501010129_0302_004783_L2S_DU2_05A.h5
example: GPMCOR_DPR_1405281041_1214_001397_L2S_DD2_05A.h5
 GPMCOR_DPR ... sensor name. 
 140528 ... 2014/05/28 (year/month/day)
 1041_1214 ... 10:41 to 12:14 UT (start time ~ end time)
 001397 ... orbit number
 L2S ... Level2 standard
 DD2 ... algorithm ID
 05A ... product version

file structure

/NS ... KuPR
/HS ... KaPR "high-sensitivity"
/MS ... KaPR "matched scan" (Same position as KuPR)
/NS/PRE/sigmaZeroMeasured ... for land monitoring

How to handle GPM data in python

fn="GPMTRM_PR1_0508301259_1432_044399_L2S_PU2_8b18_mod.h5"
infh=h5py.File(fn, 'r')
infh.keys()
zc=infh['/NS/PRE/localZenithAngle'].value
for i in range(za[1,:].size):
           print([i, np.mean(zc[:,i]), np.std(zc[:,i])])
Last modified:2019/02/09 10:53:03
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