GOES Image Scanline Shear

28 February 1999

GOES-8 Image Navigation and Registration (INR) requirements are tough. Images must be constructed from line-by-line back-and-forth east-west scans to 0.00001 radian, or some line-to-line shearing will be observed. The satellite and ground system do not always achieve this precision, and so the images "swim" a little if you run a fast, full-resolution time-series of high-contrast surface features.

However, much larger scanline displacements began to occur in GOES-8 early in 1997, apparently due to the brief loss of Image Motion Compensation (IMC) data from the Attitude and Orbit Control Electronics (AOCE).

GOES-8 image shear is observed in several classes:

mail icon Dennis.F.Chesters@nasa.gov
GOES Project