基于MODIS NDVI的植被长势监测研究

Study on Vegetation Growth Monitoring based on MODIS NDVI

遥感技术是农作物种植面积监测的一种快速、经济和准确的新技术。本次研究以我国西北部区域为研究区,利用MODIS NDVI数据,对该区域的草场植被长势进行监测。结果表明:a)植被的NDVI值呈季节性变化规律,研究区东南地区植被长势良好,而西北地区植被长势不佳;b)MODIS地表反射率数据(MOD13Q1)对西北地区的植被生长动态监测得到了很好的验证,可见,用时间序列的NDVI值监测植被长势是可行的;c)根据MODIS NDVI数据反映的该地区植被覆盖情况,相关部门应当因地制宜,做好防护措施,防止牧民过度放牧,使该地的生态脆弱性不被破坏。

Remote sensing technology is a fast,economic and accurate new technology for crop planting area monitoring.In this study,the northwest of China is taken as the research area,and MODIS NDVI data is used to monitor the growth of grassland vegetation in this area.The results show that:a)NDVI value of vegetation changes seasonally,and the growth of vegetation in the southeast of the study area is good,while the growth of vegetation in the northwest is not good;b)MODIS surface reflectance data(MOD13 Q1)has been well verified for the dynamic monitoring of vegetation growth in the Northwest.It can be seen that it is feasible to use NDVI value of time series to monitor vegetation growth;c)According to MODIS,the NDVI data reflects the vegetation coverage of the area,the relevant departments should take measures according to local conditions to prevent herdsmen from overgrazing,so that the ecological vulnerability of the area will not be damaged.