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GVAR Download Center Files
June 19, 2008: Currently, GVAR transmits only factory-measured calibration coefficients
for the Imager's visible channel, which quickly become out of date after launch. In the
past few years, an adjustment factor for these coefficients has been provided by the STAR
and used in many applications. We want to modify the SPS calibration database to include
the adjustment factor, which will be updated monthly in collaboration with the STAR, and
to modify the GVAR to include the adjustment factor in a location that is currently empty.
Further details about the proposed change are provided in the
“Visible_Calibration_Coeff_Update.pdf” White Paper which may be downloaded from the
Downloads section of this page.
For Midnight Blackbody Calibration Correction implementation information please refer to the
GOES Imager and Sounder Calibration web page.
September 20, 2007: Added GVAR for the XGOHI Missions Technical Note. NOAA is confirming
that GOES-10 will no longer able to perform on-board image navigation by early October.
NOAA is already seeing saturation on some of the image frames and in telemetry. The new
ground-based image navigation system, XGOHI, is ready for long term testing and implementation.
The University of Wisconsin has verified the XGOHI re-sampled data meets existing data quality
and has compared the XGOHI re-sampled data with GOES-12 data. A draft presentation of the
results of their study is at:
ftp://ftp.ssec.wisc.edu/ABI/xgohi/XGOHI_summary_02Oct07_draft.ppt
On October 1 at 1343z, NOAA will command GOES-10 to stop on-board image navigation (e.g. switch
to Imager IMC Off mode). Twenty four hours later on October 2 at 1343z, NOAA will turn on the
XGOHI system to re-sample the images and provide ground image navigation on a fixed grid. The
re-sampled GVAR data is almost the same as the traditional navigated GVAR data with on-board
navigation on. However, if you need higher accuracy, there is additional information in the
GVAR stream that will let you know if the re-sample system is on/off and show how to adjust
your ingest systems to correct for timing. GVAR for the XGOHI Missions-Technical Note.doc is
a white paper explaining the changes in the GVAR system. This document will also be posted on
our GOES-10 web site.
In the near future, NOAA will provide a document describing the method used to re-sample the
data.
If you have any problems after we have turned the re-sampling system, please notify NOAA
through the OPS Committee email group:
OPS_Committee_GOES_10@noaa.gov
If you have significant questions not answered by
the information provided here or via the GVAR Download Center
files, you can contact the following:
Bashar Al-Mallah at bashar.al-mallah@noaa.gov
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Downloads:
If you have trouble downloading the files, try right-clicking on the
link and choosing the save option from the pop-up menu.
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Geostationary Operational Environmental Satellite (GOES)
Operations Ground Equipment (OGE) Interface Specification Files |
Size(MB)
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Description |
GOES-O-GVAR_Change.pdf |
19 KB |
White Paper for copying the instrument nadir and detector offsets from Block 11 to Block 0 for GOES-O and -P |
| G023_504.02_DCN3_Sect_3.pdf |
1.1
MB
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GOES Operations Ground Equipment (OGE) Interface Specifications, DRL 504-02 Part 1,
Revision 2, Section 3.0, GVAR Transmission Format |
| G023_504.02_DCN3_Sect_4.pdf |
1.08
MB |
GOES Operations Ground Equipment (OGE) Interface Specifications,
DRL 504-02 Part 1, Revision 2, Section 4.0, GIMTACS-OGE Interface |
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Earth_Location_User's_Guide.pdf |
0.4 MB |
GOES I-M and GOES-NOP DRL 504-11, Earth Location User's Guide (ELUG)
Revision 2 July 2005 |
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GVAR_for_the_XGOHI_Missions.doc |
80 KB |
This technical note provides a concise description and serves
as a request for user feedback relating to the adaptations made to standard
GVAR for Extended GOES High Inclination (XGOHI) missions. |
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Visible_Calibration_Coeff_Update.pdf |
100 KB |
White Paper for Visible Calibration Coefficients Update |
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