A snow cover mapping algorithm based on MODIS data in Qinghai Province

Abstract

Abstract: Using the MODIS (moderate resolution imaging spectroradiometer) surface reflectance product of MOD09GA, the daily composite product of MOD10A1, and snow depth data observed in climate stations, the snow classification accuracy under different NDSI (normalized difference snow index) thresholds were studied. The snow classification accuracy of these snow cover maps were evaluated to find a credible NDSI threshold in Qinghai Province. 1) With a clear sky, the snow classification accuracy of MOD10A1 was 86.01% when snow depth was more than 3 cm. 2) In the study areas, the credible NDSI threshold value was 0.37. When snow depth was more than 3 cm, a snow classification accuracy of user-defined images under clear skies was 90.37%, with an overall accuracy of 99.51%, commission error of 0.22%, and omission error of 9.63%. 3) Compared with the MOD10A1 product, the user-defined snow cover images had higher overall accuracy and snow classification accuracy for different snow depths. Thus, the new NDSI threshold was more suitable for this study area in snow cover mapping.

CLC Number:

S127

WANG Xue-lu, WANG Wei, FENG Qi-sheng, LV Zhi-bang, LIANG Tian-gang. A snow cover mapping algorithm based on MODIS data in Qinghai Province[J]. Acta Prataculturae Sinica, 2012, 21(4): 293-299.

References

[1] 梁继, 张新焕, 王建. 基于NDVI背景场的雪盖制图算法探索[J]. 遥感学报, 2007, 11(1): 85-93.
[2] 张娟, 冯蜀青, 徐维新. MODIS数据在青海省积雪监测中的应用[J]. 青海气象, 2006, 1: 55-57.
[3] 周陆生, 李海红, 汪青春. 青藏高原东部牧区大—暴雪过程及雪灾分布的基本特征[J]. 高原气象, 2000, 19(4): 480-458.
[4] 王丽红, 付培建, 鲁安新. 遥感技术在牧区雪灾监测研究中的应用[J]. 遥感技术与应用, 1998, 13(2): 32-36.
[5] 刘兴元, 龙瑞军, 尚占环. 草地生态系统服务功能及其价值评估方法研究[J]. 草业学报, 2011, 20(1): 167-174.
[6] 韩立辉, 尚占环, 任国华, 等. 青藏高原“黑土滩”退化草地植物和土壤对秃斑面积变化的响应[J]. 草业学报, 2011, 20(1): 1-6.
[7] Hall D K, Riggs G A, Salomonson V V. Algorithm Theoretical Basis Document (ATBD) for the MODIS Snow and Sea Ice-Mapping Algorithms[DB/OL]. [2011-11-25]. http: //modis. gsfc. nasa. gov/data/atbd/atbd_mod10. pdf. 2001.
[8] Liang G, Huang D, Wu X. An application of MODIS data to snow cover monitoring in a pastoral area: A case study in Northern Xinjiang, China[J]. Remote Sensing of Environment, 2008, 112: 1514-1526.
[9] Keith N A, Amir A K. Investigation of MODIS Snow Mapping in A Boreal Forest Watershed[C]. Baltimore: ASPRS, 2009.
[10] 张学通. 青海省积雪监测与青南牧区雪灾预警研究[D]. 兰州: 兰州大学, 2010.
[11] 曹云刚, 杨秀春, 徐斌, 等. MODIS在青藏高原大范围积雪制图中的应用及存在的问题[J]. 科技导报, 2007, 25(21): 51-54.
[12] 郝晓华, 王建, 李弘毅. MODIS雪盖制图中NDSI阈值的检验——以祁连山中部山区为例[J]. 冰川冻土, 2008, 30(1): 132-138.
[13] 张国胜, 伏洋, 杨琼, 等. 青海省天然草地类型空间分布特征及气候分区[J]. 草业科学, 2009, 26(1): 23-29.
[14] 陈钟, 冯琦胜, 黄晓东, 等. 青海省主要类型天然草地EVI动态变化[J]. 草业科学, 2010, 27(5): 23-29.
[15] 李东, 黄耀, 吴琴, 等. 青藏高原高寒草甸生态系统土壤有机碳动态模拟研究[J]. 草业学报, 2010, 19(2): 160-168.
[16] 徐裕华. 高原牧区雪冻灾害的气候特征[J]. 四川气象, 1998, (2): 28-32.
[17] Riggs G A, Hall D K, Salomonson V V. MODIS Snow Products User Guide Collection 5 [DB/OL]. [2011-01-20]. http: //modis-snow-ice. gsfc. nasa. gov/uploads/sug_c5. pdf. 2006.
[18] Hall D K, Riggs G A. Accuracy assessment of the MODIS snow-cover products[J]. Hydrological Processes, 2007, 21: 1534-1547.
[19] 黄晓东, 张学通, 李霞, 等. 北疆牧区MODIS积雪产品MOD10A1和MOD10A2的精度分析与评价[J]. 冰川冻土, 2007, 29(5): 722-729.