Answer to question 9

Did You Know?

To verify the interpretation of a satellite image, it is common to inspect selected sites and targets on the ground. This is often called "ground truthing". Yet, when the target is distributed over a large or inaccessible area, then ground truthing is more conveniently performed by aerial inspection or aerial photography! Interpretation of small-scale imagery such as that from the NOAA AVHRR sensor has been known to be ground truthed using the larger scaled Landsat imagery! Perhaps the term "ground truthing" needs to evolve to something more appropriate.