基于高分一号遥感影像的植被覆盖遥感监测——以厦门市为例

Remote sensing monitoring of vegetation coverage by GF-1 satellite: A case study in Xiamen City

植被对环境变化有重要影响,特别是在碳循环中起着关键性作用。随着局地植被精细化监测要求的提高,传统中低分辨率遥感植被监测方式已经很难满足需求,而高分辨率卫星具有高空间分辨率优势,可以对植被进行更精细的遥感监测。本研究从高分一号卫星数据的特征出发,研究高分一号卫星数据辐射定标、大气校正和正射校正的预处理方法及高分一号卫星植被覆盖度遥感反演方法。最后,以福建省厦门市为例,利用高分一号多光谱相机(GF-1-WFV1)16 m影像数据反演植被覆盖度,并划分植被覆盖等级。根据植被覆盖度分布显示,高分一号卫星能精确监测厦门市植被覆盖度分布状况。监测统计结果表明,厦门市大部分地区为高或较高植被覆盖度区,其中,海沧、集美、翔安和同安内陆地区植被覆盖等级明显优于沿海地区,厦门岛南部地区植被覆盖度优于北部地区。

Forests have an important impact on global environmental change,especially in the carbon cycle.The demand of sensing monitoring for meteorological disasters,especially typhoon and flood,has become increasingly important.Traditional sensing monitoring of low and medium resolution can hardly meet the requirement.High resolution satellite has the advantage of high spatial resolution in vegetation monitoring.In this paper,the characteristics and pretreatment methods of GF-1 satellite images were studied in detail.The methods of radiation calibrater,atmospheric correction,ortho-rectification and calculating vegetation coverage were described in this paper.Finally,there was a case study of vegetation eco-environmental monitoring in Xiamen City.Researches show that most part of Xiamen belongs to high or higher vegetation coverage area,and the vegetation coverage in Haicang,Jimei,Xiangan and Tongan inland areas is significantly better than that in coastal areas.In the island of Xiangan,the vegetation coverage is better in the southern part than in the northern part.