基于HJ-1A-B卫星影像的污水灌区植被指数研究

Research on NDVI of Sewage Irrigation Area Based on HJ-1A-B Data

污水灌区植被指数的研究对污水排放、生态保护等方面具有指导意义。利用山东省龙口市2008-2010年21个时相的中国环境与灾害监测预报小卫星(HJ-1A-B)CCD影像数据,选取易于比较的典型污水灌区和清水灌区,提取NDVI平均值,得到3年同期的数据,进行横向和纵向的量化比较。结果表明,NDVI能够动态监测植被变化,污水灌区与清水灌区内的植被指数随时间的变化趋势基本一致,但污水灌区内的植被指数呈现逐年递减的变化趋势;生活污水灌区内的植被表现出早熟现象,工业废水灌区内的植被指数是所有研究区内最低的。

The study of Vegetation Index of sewage irrigation area has guiding significance to the sewage disposal,ecological protection and so on.This thesis,taking advantage of 21 CCD image data of the Chinese environmental and disaster monitoring and forecasting of small satellites(HJ-1A-B) during 2008-2010,selected sewage irrigation area and clean water irrigation area which is typical and easy to be compared.Then,every average NDVI was extracted from every area in those images over 3 years.Finally,those NDVI mean values were compared horizontally and longitudinally comparison.Experimental results show that,NDVI can monitor vegetation change in dynamically;the vegetation index's trends over time in both sewage irrigation area and clean water irrigation area was basically consistent,but the vegetation index in sewage irrigation area showed decreasing trend year by year;in domestic sewage irrigation area,the vegetation showed precocious phenomenon and the vegetation index was the lowest of all the study areas in industrial wastewater irrigation area.