资源简介

摘要： 基于2010年3个时期的TM遥感影像数据,应用像元二分模型进行北京地区的植被盖度反演。并根据野外实际测量数据研究植被盖度的季节变化情况。应用3个时相的TM数据,分别计算像元二分模型中的参数NDVIsoil和NDVIveg获得了北京地区不同时间的植被盖度信息。进一步应用实地监测的植被盖度数据进行精度验证。结果表明:反演的植被盖度与实地测量植被盖度具有较好的相关性,从散点图上看,数据点多集中在1∶1线附近,3个时期两者间的相关系数均大于0.8,并且2010年的3期植被盖度图像显示的季节变化与地表实际测量的植被盖度季节变化类似。 关键词： 植被盖度;  NDVI;  像元二分模型;  北京     Abstract: The research estimated the vegetation coverage using dimidiate pixel model based on three TM images in 2010 in Beijing.And the paper shows the seasonal changes of vegetation coverage based on the real vegetation coverage in the field.The paper respectively calculates the NDVIsoil and NDVIveg which are the parameters of dimidiate pixel model in three periods,and gets vegetation coverage in Beijing.In addition,this study measured the real vegetation coverage in the field and got the seasonal change curves of vegetation coverage.The relationship between real values and estimated values of vegetation coverage is significant.The data nearly aggregated around the line 1∶1 in the plot of real values and estimated values.The correlation coefficient between them are all over 0.8 during the three periods.They are closely related to each other.The curves of seasonal change getting from TM image are similar to those of the real vegetation coverage during the three periods in 2010.

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