During the early stages of knowledge acquisition through remote sensing technology, it was applied to remote, inaccessible, and possibly even hostile environments. The surface of the ocean comes to mind, pristine regions of the Amazon rain forests, and Death Valley in California and Nevada. We only seldom think about how our presence in our own habitat, and our own modifications to it, including our constructions, influence our environment. The environment that we modify in turn significantly impacts our living conditions. Comparison of thermal characteristics of low-bush coverage of a patch of Earth surface with those of human-made structures (roofs, streets, parking lots, stadiums, etc.), we realize that artificial constructions tend to absorb and accumulate heat. Therefore, a city will generally be hotter than the surrounding cultivated land or natural landscape. Humans are, on the average, about 150- to 160-cm tall, so this distance is incorporated as a significant derived feature in human constructions. Luo and Li use LANDSAT data to determine the optimal size of the aggregates in spatial scales from 30 m to 1200 m. They identify heat islands primarily within the populated areas. Furthermore, they find that adjacent large rivers ameliorate the effects of high population concentration.