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CPTEC TDF -> McIDAS AREA imagery compared to SSEC McIDAS AREA imagery

NOTES

• CPTEC images in AREA format created from TeraScan TDF images received in IDD EXP datastream from moingobe.cptec.inpe.br on yakov.unidata.ucar.edu
• SSEC images represent sectors broadcast in the IDD UNIWISC datastream
• Scatter plots are for a sector 700 x 900 centered on Lat: 7 S Lon: 70 W
• all displays were created in McIDAS-X v2006 using:
  • IMGCOPY - create sectors from each source that were identical in size, resolution, and center point
  • IMGDISP - display images and draw maps
  • IMGPLOT - scatter plot of image values (brightness)

Imagery comparisons

CPTEC vs SSEC GOES-12 Image Comparisons for 20060710.1445 UTC
Channel	CPTEC Image	SSEC Image	Scatter Plot of Brightness
Visible	0.65 um Visible	0.65 um Visible	0.65 um Visible
Water Vapor	6.5 um Water Vapor	6.5 um Water Vapor	6.5 um Water Vapor
Thermal IR	10.7 um Thermal Infrared	10.7 um Thermal Infrared	10.7 um Thermal Infrared

Preliminary Comments:

1. the CPTEC images being sent appear to conform to the AREA file format nicely
2. the comparison of the navigation between the images is very good
3. VIS images: it appears that the pixel values in the CPTEC images are scaled so that the lowest values seen maps to 0 brightness and the highest values seen maps to 255 brightness
4. WV images: like the VIS images, it appears that the pixel values in the CPTEC images are improperly mapped to the 0 - 255 brightness range
5. IR images: the comparison for the thermal IR (10.7 um) is the best of the group, but still exhibits suspect brightness mapping

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