Ticket #3836 (closed defect: invalid)

Opened 3 years ago

Last modified 2 years ago

gdalinfo reports wrong typedata in HDF TRMM (and possibly other) product

Reported by: vesnikos Owned by: warmerdam
Priority: normal Milestone:
Component: default Version: unspecified
Severity: normal Keywords:
Cc:

Description

GDAL 1.8dev, released 2010/01/19

gdalinfo 3B43.060801.6.HDF

Files: 3B43.060801.6.HDF Size is 512, 512 Coordinate System is `' Subdatasets:

SUBDATASET_1_NAME=HDF4_SDS:UNKNOWN:"3B43.060801.6.HDF":0 SUBDATASET_1_DESC=[1x1440x400] precipitation (32-bit floating-point) SUBDATASET_2_NAME=HDF4_SDS:UNKNOWN:"3B43.060801.6.HDF":1 SUBDATASET_2_DESC=[1x1440x400] relativeError (32-bit floating-point)

Corner Coordinates: Upper Left ( 0.0, 0.0) Lower Left ( 0.0, 512.0) Upper Right ( 512.0, 0.0) Lower Right ( 512.0, 512.0) Center ( 256.0, 256.0)

Its an TRMM 3b43 product ( a sample can be downloaded from  ftp://pps.gsfc.nasa.gov/trmmdata/ByDate/V06/2006/10/01/3B43.061001.6.HDF.gz )

the product description clearly states that 3b43 datasets come in a 4 byte size

Change History

Changed 2 years ago by rouault

  • status changed from new to closed
  • resolution set to invalid

 http://disc.sci.gsfc.nasa.gov/precipitation/documentation/TRMM_README/TRMM_3B43_readme.shtml states that precipitation and relativeError are "float SDS" with a record of type 4. Which is exactly a 32-bit floating point as repoted by GDAL. So it looks all right. a display of HDF4_SDS:UNKNOWN:"3B43.060801.6.HDF":0 in qgis for example leads to something that look visually at least OK

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