【摘要】 在收集处理了了 1981～ 1994年连续 5 0 4旬的由NOAAAVHRR第 1、2通道的反射率计算得的NDVI时间系列数据 ,以及 1980～ 1994年全国 10 2个固定农气观测站的旬土壤湿度资料 (- 2 0cm)和相应测站的田间持水量资料基础上 ,分析了全国NDVI及植被状态指数VCI的时空变化特征 ,发现NDVI值随季节 (旬 )分别表现为“双峰型”和“单峰型”的变化 ,在第 17～ 2 7旬之间达到极大值 ,并与作物生长有关 ,VCI的变化与NDVI的变化呈相反趋势 ;对资料因站点的分布和密度以及时序位相等差异可能影响资料代表性的探讨认为 :因旱情发展有一个过程 ,故NDVI、SHI的时空特性应该不会影响其分析结果的代表性。综合分析了资料的时空代表性 ,为干旱遥感监测模型的建立作准备。更多还原

【Abstract】 Drought has occurred frequently since recent decades all over the world,and has restricted directly or indirectly the social and economic development and threatened human existence. Drought occurs frequently in China,too,and impacts seriously the economic development,especially agriculture. In this paper, the temporal and spatial change characteristics of NDVI and VCI are analyzed by collecting and processing the temporal series data of NDVI computed from the reflectivity of CH 1 and CH 2 of NOAA AVHRR data for every ten-day period during 1981～1994,and using the data of ten-day soil moisture content (20 cm in depth) and the corresponding data of field maximum moisture capacity,collected by 102 standard agro-meteorological stations in China during 1980～1994. Moreover,the temporal and spatial representativeness of the data is analyzed in detail so as to provide the basis for developing remote sensing monitoring models.更多还原