Greenland Ice Velocity from Sentinel-1 Edition 4

Greenland Ice Velocity from Sentinel-1 The PROMICE Ice Velocity product is a timeseries of Greenland Ice Sheet velocity mosaics based on ESA Sentinel-1 SAR offset tracking. The product spans the period January 2016 to present. Spatial resolution: 200 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, 1B and 1C is included in the mosaic. Each mosaic is supplied as a NetCDF file. Projection: Polar Stereographic projection (EPSG: 3413) The data product is described in detail in Solgaard et al., 2021 (see reference below) 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 for Edition 4: The product resolution is now 200 m Improved delineation of the velocity field at outlet glacier margins. More details on the updated processor to be described in a planned update of the PROMICE ice velocity ESSD publication. NOTE version 18: The products cycle314_315 through cycle318_319 have been updated. Some tracks were missing in the previous versions. Main updates for Edition 3: The dataset has been extended back in time and now covers: January 2016 - Present Main updates performed for Edition 2: 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. NOTE: 6 day pairs in mosaics are back since end of March 2025: We now also include data from Sentinel-1 C in the mosaics. How to cite: When using the dataset please use: Anne Solgaard; Anders Kusk, 2021, \"Greenland Ice Velocity from Sentinel-1 Edition 4\", 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.\"

基于Sentinel-1的格陵兰冰盖流速数据集

PROMICE冰盖流速产品是一套基于欧洲空间局（European Space Agency, ESA）Sentinel-1合成孔径雷达（Synthetic Aperture Radar, SAR）偏移追踪技术生成的格陵兰冰盖流速镶嵌图时间序列数据集。该数据集的时间跨度为2016年1月至今。

空间分辨率：200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。
单幅镶嵌图：所有可获取的、使用Sentinel-1A、1B及1C卫星生成的6天与12天基线影像对均被纳入该镶嵌图。
单幅镶嵌图以NetCDF格式文件提供。
投影：极球面投影（EPSG: 3413）

本数据集的详细说明可参见Solgaard等人2021年的研究（详见下文参考文献）。我们力争在最后一次数据采集完成后的10天内发布新的镶嵌图。如需查看或提交评论与建议，请访问：github.com/GEUS-PROMICE/Sentinel-1_Greenland_Ice_Velocity

### 第4版主要更新
1. 数据集空间分辨率现已提升至200米
2. 出口冰川边缘的流速场轮廓划分精度得到优化
3. 关于更新后处理器的更多细节将在PROMICE冰盖流速数据集的《地球系统科学数据（Earth Syst. Sci. Data）》计划更新论文中予以说明。

### 版本18说明
cycle314_315至cycle318_319的产品已完成更新，此前版本中存在部分轨道数据缺失的问题。

### 第3版主要更新
数据集的时间跨度已向后延伸，现已覆盖2016年1月至今的完整时段。

### 第2版主要更新
1. 每幅覆盖2个周期的镶嵌图均纳入了所有可获取的6天与12天基线影像对
2. 不再对无冰区域的结果进行掩膜处理，以避免冰盖推进过程中冰流信号被误移除
3. 采用Solgaard等人2021年提出的筛选方案（详见下文参考文献）

### 版本11说明
在版本11之前，2021年的镶嵌图未正确执行筛选操作。版本11中已对受影响的镶嵌图重新进行筛选并重新上传。

### 版本31说明
在版本31之前，2017年的时间序列存在数据间隙，现已完成补全。

### 2021年12月23日起无6天基线影像对说明
由于Sentinel-1B卫星发生故障，自2021年12月23日起未能获取该卫星的数据。因此，此后生成的镶嵌图均未包含6天基线影像对，这会降低已发布冰盖流速镶嵌图的质量。

### 2025年3月底起恢复6天基线影像对说明
现已将Sentinel-1C卫星的数据纳入镶嵌图生成流程，因此自2025年3月底起，镶嵌图可重新包含6天基线影像对。

## 数据集引用规范
使用本数据集时，请引用如下文献：
Anne Solgaard; Anders Kusk, 2021, "Greenland Ice Velocity from Sentinel-1 Edition 4", https://doi.org/10.22008/promice/data/sentinel1icevelocity/greenlandicesheet, GEUS Dataverse

正式学术引用格式：
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.

致谢内容要求：
请在致谢中添加如下语句："冰盖流速图由格陵兰冰盖监测计划（Programme for Monitoring of the Greenland Ice Sheet, PROMICE）生成，采用了哥白尼计划（Copernicus）Sentinel-1合成孔径雷达影像，由欧洲空间局（ESA）分发，并由丹麦与格陵兰地质调查局（Geological Survey of Denmark and Greenland, GEUS）通过http://www.promice.dk提供。"