Answer:
A linear shift in color is due to gain change in
the sensor, which occurs when the sensor encounters an
area of consistently different reflectance (for
example, when the sensor encounters snowy regions or
highly reflective desert areas).
These artifacts will be apparent in the Landsat 7
browse, because the browse image has been generated
directly from raw uncalibrated data. However, when the
Landsat 7 order is placed, a calibration parameter
file containing all gain change information will be
used to process the data. Therefore, theappropriate
gain and bias values will be incorporated into the
scene processing. These artifacts will not exist in
the final processed (Level 1) product.
