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遥感产品的应用越来越受到各行各业的高度关注,因此定量遥感产品的真实性检验工作已是当务之急,也是近年来遥感领域研究的热点问题之一。首先总结了国内外学者在LAI遥感产品真实性检验中使用的方法和取得的研究进展,然后结合实例分析了黑河中游不同分辨率LAI产品的真实性检验。通过比较两种不同尺度转换方案得到1km分辨率的LAI对MODIS LAI产品进行验证,并分析了LAI的尺度效应。结果表明:两种方案比较验证的相关系数为0.57和0.39,借助于高分辨率影像作为中间尺度验证MODIS LAI产品要比直接利用地面实测点尺度转换到低分辨率LAI图验证MODIS LAI产品更合理,且黑河中游MODIS LAI产品存在明显的低估现象,最大偏差达2.26。
The application of remote sensing products is getting more and more attention from all walks of life. Therefore, the authenticity test of quantitative remote sensing products is a top priority and one of the hot issues in remote sensing field in recent years. First of all, the methods and the research progress of domestic and foreign scholars in the authenticity test of LAI remote sensing products are summarized. Then the authenticity test of LAI products with different resolutions in the middle reaches of Heihe River is analyzed. The LAI with 1km resolution was compared by comparing two different scale conversion schemes to validate MODIS LAI products, and the scale effect of LAI was analyzed. The results show that the correlation coefficients between the two schemes are 0.57 and 0.39, respectively. It is more reasonable to validate the MODIS LAI product by using the high-resolution image as the middle scale to validate the MODIS LAI product than directly using the ground-based measurement point scale conversion to the low-resolution LAI map , And MODIS LAI products in the middle reaches of Heihe have obvious underestimation, the maximum deviation is 2.26.