The observations, analysis, notes and musings posted here are based on
facts gathered in the field from around the world by reporters,
bloggers, photographers and videographers. The term "ground truth" is
actually a scientific concept defined by NASA as part of the
calibration process of satellite imagery. When NASA measures something
with a satellite, an employee on the ground takes the same
measurement. If the results differ, the "ground truth" has greater
credibility than the satellite does.
