The Spatial And Temporal Characteristics Of Years Of MODIS Image Based On The Results Of Surface Temperature Retrieval

In recent years, as the development of science and technology, and the continuous deterioration of environment, much more people began to concern their ambient temperature changes, such as: greenhouse effect, urban heat island and so on. The temperature involved in these examples is the air temperature, and the most direct and important heat source of the air temperature is the Earth's surface, so the study of the ground temperature became necessary. Land surface temperature combines the matter and energy exchange results of ground-atomoshere in the interaction.The accurate determination of the land surface temperature has a great importance for the study of global climate changes,disaster monitoring and resource management.For the local received original image data of MODIS HDF format, take the preprocessing of destriping,geometric correction and atmospheric correction. The land surface temperature distribution was calculated for each pixel of image using split window algorithm, which was converted to grid form in ENVI software. In order to improve the running efficiency ,the whole site of original image need to be cut. According to the study area boundary, cut the data according to the size of the study area of the mask. The results were converted into bitmap, then select the value greater than 200K, the other value is invalid. Using Kriging method,resample 1km resolution into 100m×100m for statistical analysis. Compared to the same period of NASA data products published on the website, the results of in this paper achieves good results. Calculate the daily land temperature data, then compose the product of a period of ten days and month, Take the synthesis of the spatial and temporal evolution of land surface temperature combined with the study area.Base on the temperature distribution, take an analysis of the typical area of land temperature,dicuss the urban heat island,cold lake effect,Foehn wind ,and the relation with the river,transportation lines and so on. By analyzing the land temperature with other natural,human activities, reveal some rules, and facilitate the activities of human's practice as a guide.