If this is the level of research coming out of the US, my how the mighty have fallen.Also the sensor saturation problem where 63 is the limit and anything above that no longer matters. That means that beyond a certain limit, further intensive development of megacities is underestimated. You can reduce the gain but then it underestimates rural areas as they get binned into the 0 category.
Should have hired some Chinese international students to run the study.