The precise monitoring of Beijing thermal behaviour

This paper uses the temperature product of Modis by the Terra satellite. Isograms, anomaly value and indirect method are applied to analyze the daily variation, seasonal variation and annual variation of Beijing heat field. The results show that isograms are tidier in the evening compared with the day. And the temperature gradient is diminishing from the city center to the edge of urban areas. The heat island effect is the strongest during the day in the summer of all seasons during the day and night. The heat island in the evening of the four seasons is as obvious as the day in the spring and fall. The increasing temperature, the enhancing intensity and the expanding area of the heat island are the current situation of Beijing which are the result of the multiplying of the population. Because of the limited data, further studies are needed to study the seasonal variation and annual variation of Beijing.