[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[McIDAS #HLZ-722478]: Problem displaying Himawari visible image

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: [McIDAS #HLZ-722478]: Problem displaying Himawari visible image
  • Date: Mon, 29 Feb 2016 11:46:24 -0700
Hi Kwan,

Before diving into the code in IMGDISP (imgdisp.pgm) to find out why
the IMGLIST listing for your Band 3 Himawari AREA file does not
include information about what Band 3 is, I decided to create my
own sector with the same parameters (e.g., lines x elements, band, etc.)
as your AREA file and then test it locally.  What I found is that the
AREA file that I created works without problems.

The following IMGLIST listings for your and my Band 3 AREA files
show one of the aspects that are different:

Your image is in AREA2005, and this maps to position 2005 in my
local MYDATA/IMAGES dataset:

IMGLIST MYDATA/IMAGES.2005 FORM=ALL
Image file directory listing for:MYDATA/IMAGES
 Pos Satellite/         Date       Time      Center      Res (km)   Image_Size
     sensor                                 Lat  Lon    Lat   Lon
 --- -------------  ------------  --------  ---- ----  ----- ----- ------------
2005  HIMAWARI-8    20 FEB 16051  00:00:00   -17  180
   Band: 3    No Information Available                  2.00  1.92   225 x  300
     proj:    0 created: 2016056 232911  memo: HIMAWARI Projected Full Disk
     type:VISR     cal type:REFL
     offsets:  data=     768 navigation=  256 calibration=    0 auxiliary=    0
     doc length:   0   cal length:   0   lev length:   0 PREFIX=   0
     valcod:          0 zcor:  0 avg-smp: N
     start yyddd: 2016051  start time:     0  start scan:    0
     lcor: 5331  ecor:  6533  bytes per pixel: 1  ss: 86
     Resolution Factors (base=1):   Line=    2.0   Element=    2.0
IMGLIST: done

My image is in AREA2006, and this maps to position 2006 in my
local MYDATA/IMAGES dataset:

IMGLIST MYDATA/IMAGES.2006 FORM=ALL
Image file directory listing for:MYDATA/IMAGES
 Pos Satellite/         Date       Time      Center      Res (km)   Image_Size
     sensor                                 Lat  Lon    Lat   Lon
 --- -------------  ------------  --------  ---- ----  ----- ----- ------------
2006  HIMAWARI-8    29 FEB 16060  17:50:00   -18  180
   Band: 3    0.64 um Daytime clouds and vegetation     0.60  0.77   225 x  300
     proj:    0 created: 2016060 181503  memo: HIMAWARI-8 Full Disk
     type:WARI     cal type:RAW
     offsets:  data=    1280 navigation=  256 calibration=  768 auxiliary= 1280
     doc length:   0   cal length:   0   lev length:   0 PREFIX=   0
     valcod:          0 zcor:  0 avg-smp: N
     start yyddd: 2016060  start time:175000  start scan:    0
     lcor:14606  ecor: 18167  bytes per pixel: 2  ss: 86
     Resolution Factors (base=1):   Line=    1.0   Element=    1.0
IMGLIST: done

Note that the listing for you image indicates that there is no information
for the wavelength channel:

   Band: 3    No Information Available

The listing for my image correctly shows the wavelength channel information
as defined in the file SATBAND:

   Band: 3    0.64 um Daytime clouds and vegetation

This coupled with a calibration unit indicated in your image, REFL, that
is not recognized for Himawari imagery in McIDAS tells me that whatever
code made your AREA2005 image is incorrect, or, at least, completely
non-standard and, therefore, should be ignored.

Cheers,

Tom
--
****************************************************************************
Unidata User Support                                    UCAR Unidata Program
(303) 497-8642                                                 P.O. Box 3000
address@hidden                                   Boulder, CO 80307
----------------------------------------------------------------------------
Unidata HomePage                       http://www.unidata.ucar.edu
****************************************************************************


Ticket Details
===================
Ticket ID: HLZ-722478
Department: Support McIDAS
Priority: Normal
Status: Closed