STAR NDSI collection: A cloud-free MODIS NDSI dataset (2001–2020) for China

<strong>If you used our dataset, please cite our reference:</strong> <strong>Jing, Y., Li, X., and Shen, H.: STAR NDSI collection: a cloud-free MODIS NDSI dataset (2001–2020) </strong> <strong>for China, Earth Syst. Sci. Data, 14, 3137–3156, https://doi.org/10.5194/essd-14-3137-2022, 2022.</strong> 1. A recent 20-year cloud-free MODIS normalized difference snow index (NDSI) collection for China (excluding sea area) is generated using a Spatio-Temporal Adaptive fusion method with erroR correction (STAR). 2. The STAR NDSI collection is derived from daily 1-km MODIS NDSI datasets (MOD10A1 and MYD10A1). 3. It is provided using a WGS_1984_UTM_48N projection, with the data format of TIFF images. 4. Each ZIP contains NDSI data for one hydrological year (August to next July). After uncompressing into the TIFF format, the files are named as "NDSI_ yyyymmdd_Daily_500M_ V01.tif" for NDSI data and "QA_yyyymmdd_Daily_500M_V01.tif" for quality assessment (QA) data. 5. The accuracy of this collection has been well validated by the in-situ snow depth observations and Landsat OLI NDSI maps. The detailed information can be found in the published paper. 6. The NDSI value ranges from 0, 1-100. The value of water is set to 255. The fill value is set to 127. 7. Disclaimer: The spatial scope of the dataset is for research convenience. Please refer to official release for a standard map of China, http://211.159.149.56/index.html. 8. The new version includes data from 2001 to 2020, while the old version includes data from 2012 to 2020 (https://doi.org/10.5281/zenodo.5644386). 9. In case any questions arise, please do not hesitate to contact us ([e-mail]).若您使用本数据集，请引用如下文献： Jing Y, Li X, Shen H. STAR归一化积雪指数数据集：中国区域无云中分辨率成像光谱仪（Moderate Resolution Imaging Spectroradiometer, MODIS）NDSI数据集（2001–2020）[J]. Earth Syst. Sci. Data, 2022, 14: 3137-3156. https://doi.org/10.5194/essd-14-3137-2022. 1. 本数据集为覆盖中国全域（不含海域）的2001-2020年无云MODIS归一化积雪指数（NDSI）数据集，采用带误差校正的时空自适应融合（Spatio-Temporal Adaptive Fusion Method with Error Correction, STAR）方法生成。 2. 该STAR NDSI数据集源于每日1km分辨率的MODIS NDSI数据集（MOD10A1与MYD10A1）。 3. 本数据集采用WGS_1984_UTM_48N坐标系投影，数据格式为标签图像文件格式（Tagged Image File Format, TIFF）图像。 4. 每个压缩包包含一个水文年（8月至次年7月）的NDSI数据。解压为TIFF格式后，NDSI数据文件命名为"NDSI_yyyymmdd_Daily_500M_V01.tif"，质量评估（Quality Assessment, QA）数据文件命名为"QA_yyyymmdd_Daily_500M_V01.tif"。 5. 本数据集的精度已通过原位积雪深度观测数据与陆地卫星（Landsat）OLI传感器NDSI影像进行了充分验证，详细信息可参见已发表的相关论文。 6. NDSI数值的取值范围为0至100，其中水体像元赋值为255，填充值设为127。 7. 免责声明：本数据集的空间范围仅为科研便利划定，中国标准行政区划地图请以官方发布版本为准，详见http://211.159.149.56/index.html。 8. 新版本数据集涵盖2001年至2020年的观测数据，旧版本数据集涵盖2012年至2020年的观测数据（https://doi.org/10.5281/zenodo.5644386）。 9. 如有任何疑问，请随时联系我们（[e-mail]）。