Answer:
Even though the band combination is the same,
differences in the browse processing will make the
final images look very different between the two
sensors. Landsat 4/5 (TM) scenes have been subsampled
to a much lower resolution (480 meteres), with a
standardized stretch applied. Landsat 7 images are
resampled to 240 meters, and each image has a
customized stretch applied based on individual scene
content. The Landsat 4/5 TM images will also be
approximately 1/4 the size, but the actual data will
cover approximately the same area as a Landsat 7 ETM+
image.
In spite of these differences between the browse
images, data from the two sensor types should be
fairly comparable in data content, resolution, and
scene size.
