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| 基于LAPVAS的定量遥感反照率产品真实性检验 | |
| 其他题名 | The validation of the remote sensing albedo Products based on the LAPVAS |
| 冯智明 | |
| 出版年 | 2017 |
| 学位类型 | 硕士 |
| 导师 | 肖青 ; 闻建光 |
| 学位授予单位 | 中国科学院大学 |
| 中文摘要 | 反照率作为一种地表能量平衡、全球变化研究的重要参数，在众多研究领域中得到了广泛的应用，到目前为止已经有多种全球范围的反照率产品可业务化生产和发布，各种反照率产品的精度不一，为后续反照率产品的定量遥感应用带来了不确定性，因此，针对不同反照率产品的质量评价显得愈加重要。定量遥感产品真实性检验系统(LAPVAS)是在真实性检验理论、方法及高质量的验证数据支撑下开发的。系统利用真实性检验场、站、点、网等获取同步数据，并对数据进行数据质量控制和尺度转换等操作，利用不同的真实性检验方法来检验定量遥感产品的精度，并对产品的不确定性进行分析，为陆表遥感产品的广泛应用提供定量化依据。论文基于LAPVAS系统对国内新型反照率产品（GLASS，MuSyQ）进行真实性检验，并以国外主流的MODIS反照率产品作为对比，针对产品的不同特点和验证目的，设计完整的验证策略，从而分析三种反照率产品的精度和不确定性。在具体的验证过程中，根据所要验证的产品特点和地面站点的空间代表性不同，分别选用直接验证、多尺度验证和交叉验证方法，基于地面观测站点所在区域的地表覆盖类型分类统计反照率产品在不同地表覆盖类型条件下的精度情况，得到不同产品在各种地表覆盖类型条件下的特点和精度差异。同时，统计产品的质量控制标识分布信息，进一步深入的研究产品的质量水平。分析验证结果可以看出MuSyQ在植被覆盖类型条件下具有较高的精度水平，但是在沙漠站点中，其结果存在一定的偏差。此外，采用相同的参考数据及和验证方法对GLASS反照率产品进行验证。从整体来看，在所有的地表覆盖类型条件下GLASS反照率都具有较好的质量水平，能够充分的反映地表反照率的变化情况。由于参考数据相同，因此可以间接的对比MuSyQ和GLASS两种反照率产品的精度差异，验证结果显示GLASS反照率的精度水平整体较MuSyQ较高。最后在验证系统及地面数据支持的基础上，对MODIS 不同版本（MCD43A3 V005和V006）反照率产品进行对比分析，评价了两个版本反照率产品的精度及特点。从结果可以看出，新版本在提高了时间分辨率的同时，既能够保持稳定的高质量数据的输出比例，同时还能具有相对旧版本较高的质量水平。但是从分析质量控制标识的分布比例结果来看，V006 高质量的数据比例相对V005 较少且数据中填充值的比例高于V005版本。MODIS V006反照率产品在提高时间分辨率的同时还能保持高精度的质量，将在各个相关的研究领域中发挥重要的作用。 |
| 英文摘要 | Land surface albedo is a significant parameter in the Earth’s energy balance and plays a crucial role in the global change and climate systems. There are many global or regional land surface albedo products with various spatial resolutions and temporal frequencies have been released. The research work about the quality analysis of albedo products becomes more and more important.In order to gain the uncertainty and accuracy of the land surface quantitative products and to provide the basis for wide applications, the LAPVAS was developed based on the theory, methods and practices of the validations. It’s validating data sources are the synchronous data from the sites, points and networks of the ground observations. After different kinds of operation for the products data, such as data conversion, scale transform and validating progress, this system can acquire the accuracy of the products.Based on the LAPVAS system, three kinds of albedo products (MuSyQ, GLASS, MODIS) at home and abroad were tested for authenticity. In the process of specific verification, according to the spatial representation of the ground site, respectively, direct verification, multi-scale verification, cross validation and other methods were carried out. On the purpose of investigating the statistical index of albedo products under different surface coverage type classification, the products and in situ data were classified further.For MuSyQ albedo product, the results show that MuSyQ has a high level of accuracy under the condition of majority vegetation cover types. However, in the desert site, whether it is compared with Landsat ETM + aggregation albedo or MODIS albedo product, the results show a greater deviation. Simultaneous analysis of MuSyQ albedo product quality control flag (QC) distribution, the same accuracy problem can also be found. Therefore, the MuSyQ albedo product can reflect the true change of the albedo in the vegetation-covered area, but the data in the desert area need to be further optimized and improved.Using the same reference data and validation methods in the dispose progress of the MuSyQ albedo, the GLASS was validated under the support of the LAPVAS. From the results, it can be found that GLASS has an extremely high level of accuracy as well as a good performance, compared with different reference data. Although in the classification of statistics, with the surface coverage type changes in the accuracy of the situation , But on the whole, GLASS albedo has good quality level under all surface coverage types, and can fully reflect the change of surface albedo. Compared this two kind of albedo products based on the same reference data, the results shows that GLASS has a higher quality than MuSyQ product both at overall and under different land cover type conditions.Finally, based on the verification system and ground data support, the MODIS two different versions (MCD43A3 V005 and V006) albedo products were compared and analyzed, and the accuracy and characteristics of the two albedo products were evaluated. As can be seen from the results, the new version of product not only has a higher temporal resolution, but also a higher level accuracy than old version. However, from the analysis of the distribution of quality control flag results, V006 high-quality data ratio is less than V005 but the proportion of filled data is higher than V005 version. It is obviously that while the improved inversion algorithm improves the temporal resolution lead to the decrease of the high-quality data ratio of V006, but the overall accuracy and the accuracy under different land cover types of the V006 version albedo product is higher than old version, whatever compared with the old data or the ground data. The accuracy of each vegetation type is relatively high relative to V005, and remain stable. MODIS V006 albedo products improving the temporal resolution while maintaining high quality, will play an important role in all relevant research areas. |
| 中文关键词 | 遥感 ; 反照率 ; 真实性检验 ; MODIS ; GLASS ; MuSyQ ; 地表覆盖类型 |
| 英文关键词 | Remote sensing Albedo Validation MODIS GLASS MuSyQ Land cover type |
| 语种 | 中文 |
| 国家 | 中国 |
| 来源学科分类 | 地图学与地理信息系统 |
| 来源机构 | 中国科学院遥感与数字地球研究所 |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/288027 |
| 推荐引用方式 GB/T 7714 | 冯智明. 基于LAPVAS的定量遥感反照率产品真实性检验[D]. 中国科学院大学,2017. |
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