Greenland Ice Velocity from Sentinel-1 Edition 2

The PROMICE Ice Velocity product is a timeseries of Greenland Ice Sheet velocity mosaics based on ESA Sentinel-1 SAR offset tracking. The product span the period September 2016 to present. Spatial resolution: 500 m Temporal resolution: A new mosaic spanning 2 Sentinel-1A cycles i.e. 24 days is posted every 12 days. Each mosaic: All possible 6 and 12 day pairs using Sentinel-1A and 1B is included in the mosaic. Each mosaic is supplied as a NetCDF file. Projection: Polar Stereographic projection (EPSG: 3413) We aim to make each new mosaic available within 10 days of the last included acquisition. To see and post comments/recommendations please check out: github.com/GEUS-PROMICE/Sentinel-1_Greenland_Ice_Velocity Main updates: All 6 day and 12 day pairs possible are included in each 2 cycle mosaic. We no longer mask out results in ice free areas in order to avoid removing ice flow as the ice sheet advances We apply the culling scheme described in Solgaard, A., Kusk, A., Merryman Boncori, J. P., Dall, J., Mankoff, K. D., Ahlstrøm, A. P., Andersen, S. B., Citterio, M., Karlsson, N. B., Kjeldsen, K. K., Korsgaard, N. J., Larsen, S. H., and Fausto, R. S.: Greenland ice velocity maps from the PROMICE project, Earth Syst. Sci. Data, 13, 3491–3512, https://doi.org/10.5194/essd-13-3491-2021, 2021. NOTE: From version 11: Prior to version 11, the mosaics covering dates in 2021 were not culled correctly. In version 11 the affected mosaics have been re-culled and uploaded. NOTE: From version 31: Prior to version 31, there were gaps in the timeseries in 2017. These have now been filled. NOTE: No 6 day pairs in mosaics since Dec 23 2021: Due to a faliure on Sentinel-1 B, no data has been received from the satellite since Dec 23 2021. For this reason the mosaics produced since then includes no 6 day pairs. This limits the quality of the posted ice velocity mosaics. How to cite: When using the dataset please use: Anne Solgaard; Anders Kusk, 2021, \"Greenland Ice Velocity from Sentinel-1 Edition 2\", https://doi.org/10.22008/promice/data/sentinel1icevelocity/greenlandicesheet, GEUS Dataverse Literature citation: Solgaard, A., Kusk, A., Merryman Boncori, J. P., Dall, J., Mankoff, K. D., Ahlstrøm, A. P., Andersen, S. B., Citterio, M., Karlsson, N. B., Kjeldsen, K. K., Korsgaard, N. J., Larsen, S. H., and Fausto, R. S.: Greenland ice velocity maps from the PROMICE project, Earth Syst. Sci. Data, 13, 3491–3512, https://doi.org/10.5194/essd-13-3491-2021, 2021. Please add the following to your acknowledgements: \"Ice velocity maps were produced as part of the Programme for Monitoring of the Greenland Ice Sheet (PROMICE) using Copernicus Sentinel-1 SAR images distributed by ESA, and were provided by the Geological Survey of Denmark and Greenland (GEUS) at http://www.promice.dk.\"

PROMICE冰流速产品是基于欧洲空间局（European Space Agency, ESA）Sentinel-1合成孔径雷达（Synthetic Aperture Radar, SAR）偏移跟踪技术的格陵兰冰盖流速镶嵌图时间序列数据集。该产品的时间跨度为2016年9月至今。
空间分辨率：500米
时间分辨率：每12天发布一幅覆盖2个Sentinel-1A周期（即24天）的新镶嵌图。
每幅镶嵌图：包含使用Sentinel-1A和1B卫星数据生成的所有可能的6天和12天配对结果。
每幅镶嵌图均以NetCDF格式文件提供。
投影方式：极地立体投影（Polar Stereographic projection，EPSG: 3413）
我们力求在最后一次数据采集后的10天内提供每幅新镶嵌图。
如需查看或提交评论/建议，请访问：github.com/GEUS-PROMICE/Sentinel-1_Greenland_Ice_Velocity
主要更新：
每幅覆盖2个周期的镶嵌图均包含所有可能的6天和12天配对结果。
我们不再对无冰区域的结果进行掩膜处理，以避免在冰盖前进时遗漏冰流信息。
我们采用Solgaard等人（2021）所述的筛选方案，具体参考文献为：Solgaard, A., Kusk, A., Merryman Boncori, J. P., Dall, J., Mankoff, K. D., Ahlstrøm, A. P., Andersen, S. B., Citterio, M., Karlsson, N. B., Kjeldsen, K. K., Korsgaard, N. J., Larsen, S. H., and Fausto, R. S.: Greenland ice velocity maps from the PROMICE project, Earth Syst. Sci. Data, 13, 3491–3512, https://doi.org/10.5194/essd-13-3491-2021, 2021.
注意事项：
版本11说明：在版本11之前，覆盖2021年数据的镶嵌图未得到正确筛选。版本11中已对受影响的镶嵌图重新筛选并上传。
版本31说明：在版本31之前，2017年的时间序列存在数据缺口，目前已填补。
2021年12月23日起镶嵌图无6天配对结果：由于Sentinel-1B卫星出现故障，自2021年12月23日起未再接收到该卫星的数据。因此，此后生成的镶嵌图不再包含6天配对结果，这可能影响所发布冰流速镶嵌图的质量。
引用说明：使用本数据集时，请引用：Anne Solgaard; Anders Kusk, 2021, "Greenland Ice Velocity from Sentinel-1 Edition 2", https://doi.org/10.22008/promice/data/sentinel1icevelocity/greenlandicesheet, GEUS Dataverse
文献引用：Solgaard, A., Kusk, A., Merryman Boncori, J. P., Dall, J., Mankoff, K. D., Ahlstrøm, A. P., Andersen, S. B., Citterio, M., Karlsson, N. B., Kjeldsen, K. K., Korsgaard, N. J., Larsen, S. H., and Fausto, R. S.: Greenland ice velocity maps from the PROMICE project, Earth Syst. Sci. Data, 13, 3491–3512, https://doi.org/10.5194/essd-13-3491-2021, 2021.
致谢说明：请在致谢部分添加以下内容："Ice velocity maps were produced as part of the Programme for Monitoring of the Greenland Ice Sheet (PROMICE) using Copernicus Sentinel-1 SAR images distributed by ESA, and were provided by the Geological Survey of Denmark and Greenland (GEUS) at http://www.promice.dk."