基于MODIS NDVI的海南岛植被覆盖面积的反演技术

为了给合理监测海南岛植被生态环境变化提供理论依据，基于2015、2017年海南岛MODIS NDVI数据、地表覆盖数据，利用一元线性拟合、均方根误差分析、相关系数分析等方法开展了海南岛植被覆盖面积反演技术研究。结果表明：2015年海南岛最主要的地表覆盖类型为森林，主要分布在五指山山脉一带；其次是耕地，主要分布在海口、临高、澄迈、文昌、东方等沿海一带；植被覆盖面积（森林、草地、灌丛、湿地）占总面积的65.67%,2017年地表覆盖状况与2015年类似；海南岛植被覆盖率总体较高，中部山区市县植被覆盖率高于沿海市县，其中，五指山植被覆盖率最高，其次是琼中、白沙；海口植被覆盖率最低，其次是文昌、定安；海南岛NDVI植被覆盖面积反演的最佳阈值为0.70，在此阈值下，NDVI对2015、2017年植被覆盖的空间识别率分别达78.64%、78.74%；海南岛各市县植被覆盖面积与NDVI反演值的最佳拟合模型为：y=0.898 9x+62 708 142.60，拟合值与真实值的相关系数为0.91，均方根误差占平均值的17.50%，较反演值误差减少了7.23%，沿海市县植被覆盖面积拟合偏差率较大、内陆市县...

Research on the inversion technique of vegetation coverage in Hainan island based on MODIS NDVI

In order to provide theoretical basis for reasonable monitoring of vegetation ecological environment changes in Hainan Island, based on MODIS NDVI data and land cover data of Hainan Island in 2015 and 2017, the inversion technology of vegetation cover area in Hainan Island was studied by univariate linear fitting, root mean square error analysis and correlation coefficient analysis. The results indicated that the main type of land cover in Hainan Island was forest in 2015 which was mainly distributed in Wuzhishan mountains; Secondly, cultivated land was mainly distributed in Haikou, Lingao, Chengmai, Wenchang, Dongfang and other coastal areas; The vegetation coverage area (forest, grassland, shrub and wetland) accounted for 65.67% of the total area. The surface coverage in 2017 was similar to that in 2015. The vegetation coverage of Hainan Island is generally high, and the vegetation coverage of cities in the central mountainous area is higher than that of coastal cities. Wuzhishan has the highest vegetation coverage rate, followed by Qiongzhong and Baisha; Haikou had the lowest vegetation coverage, followed by Wenchang and Ding'an. The best threshold of NDVI vegetation coverage inversion in Hainan Island is 0.70, under this threshold, the spatial recognition rates of NDVI for vegetation cover in 2015 and 2017 reached 78.64% and 78.74% respectively; The best fitting regression model of vegetation coverage area and NDVI inversion value in Hainan Island was y=0.8988x+ 62708142.60, the correlation coefficient is 0.91 and the root mean square error accounted for 17.50% of the actual mean value, the error is reduced by 7.23% compared with the inversion value. The fitting deviation rate of vegetation coverage area in coastal cities was larger than that in inland cities.