Temporal and spatial response characteristics of vegetation NDVI to the variation of temperature and precipitation in the whole year, spring, summer and autumn was analyzed from April 1998 to March 2008 based on the S...Temporal and spatial response characteristics of vegetation NDVI to the variation of temperature and precipitation in the whole year, spring, summer and autumn was analyzed from April 1998 to March 2008 based on the SPOT VGT-NDVI data and daily temperature and precipitation data from 205 meteorological stations in eastern China. The results indicate that as a whole, the response of vegetation NDVI to the variation of temperature is more pronounced than that of precipitation in eastern China. Vegetation NDVI maximally responds to the variation of temperature with a lag of about 10 days, and it maximally responds to the variation of precipitation with a lag of about 30 days. The response of vegetation NDVI to temperature and precipitation is most pronounced in autumn, and has the longest lag in summer. Spatially, the maximum response of vegetation NDVI to the variation of temperature is more pronounced in the northern and middle parts than in the southern part of eastern China. The maximum response of vegetation NDVI to the variation of precipitation is more pronounced in the northern part than in the middle and southern parts of eastern China. The response of vegetation NDVI to the variation of temperature has longer lag in the northern and southern parts than in the middle part of eastern China. The response of vegetation NDVl to the variation of precipitation has the longest lag in the southern part, and the shortest lag in the northern part of eastern China. The response of vegetation NDVI to the variation of temperature and precipitation in eastern China is mainly consistent with other results, but the lag time of vegetation NDVI to the variation of temperature and precipitation has some differences with those results of the monsoon region of eastern China.展开更多
论文通过真实道路试验获得乘用车驾驶员特性试验数据,得到不同类型驾驶员跟车行为特性参数,提出了适应驾驶员特性的基于避撞时间TTC(Time to Collision)的报警算法,确定了报警-避撞启动逻辑,并且根据驾驶员异常行为的试验数据统计得到报...论文通过真实道路试验获得乘用车驾驶员特性试验数据,得到不同类型驾驶员跟车行为特性参数,提出了适应驾驶员特性的基于避撞时间TTC(Time to Collision)的报警算法,确定了报警-避撞启动逻辑,并且根据驾驶员异常行为的试验数据统计得到报警-避撞阈值。试验结果表明,所提出的追尾报警-避撞算法能够体现不同类型的驾驶员特性,有效提高汽车追尾报警-避撞系统的可接受性。展开更多
基金National Natural Science Foundation of China, No.40901031 Shanghai Natural Science Foundation, No.09ZR1428800+3 种基金 National Key Project of Scientific and Technical Supporting Programs, No.2007BAC29B05 Special Project of Research-style Operation in Shanghai Meteorological Bureau, No.YJ200803 No.YJ200805 National 863 Program, No.2006AA12Z104
文摘Temporal and spatial response characteristics of vegetation NDVI to the variation of temperature and precipitation in the whole year, spring, summer and autumn was analyzed from April 1998 to March 2008 based on the SPOT VGT-NDVI data and daily temperature and precipitation data from 205 meteorological stations in eastern China. The results indicate that as a whole, the response of vegetation NDVI to the variation of temperature is more pronounced than that of precipitation in eastern China. Vegetation NDVI maximally responds to the variation of temperature with a lag of about 10 days, and it maximally responds to the variation of precipitation with a lag of about 30 days. The response of vegetation NDVI to temperature and precipitation is most pronounced in autumn, and has the longest lag in summer. Spatially, the maximum response of vegetation NDVI to the variation of temperature is more pronounced in the northern and middle parts than in the southern part of eastern China. The maximum response of vegetation NDVI to the variation of precipitation is more pronounced in the northern part than in the middle and southern parts of eastern China. The response of vegetation NDVI to the variation of temperature has longer lag in the northern and southern parts than in the middle part of eastern China. The response of vegetation NDVl to the variation of precipitation has the longest lag in the southern part, and the shortest lag in the northern part of eastern China. The response of vegetation NDVI to the variation of temperature and precipitation in eastern China is mainly consistent with other results, but the lag time of vegetation NDVI to the variation of temperature and precipitation has some differences with those results of the monsoon region of eastern China.
文摘论文通过真实道路试验获得乘用车驾驶员特性试验数据,得到不同类型驾驶员跟车行为特性参数,提出了适应驾驶员特性的基于避撞时间TTC(Time to Collision)的报警算法,确定了报警-避撞启动逻辑,并且根据驾驶员异常行为的试验数据统计得到报警-避撞阈值。试验结果表明,所提出的追尾报警-避撞算法能够体现不同类型的驾驶员特性,有效提高汽车追尾报警-避撞系统的可接受性。
