IRIS: ICESat-2 River Surface Slope
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ICESat-2 River Surface Slope (IRIS) When using this data please cite Scherer D., Schwatke C., Dettmering D., Seitz F.: ICESat-2 river surface slope (IRIS): A global reach-scale water surface slope dataset. Scientific Data, 10(1), 359, 10.1038/s41597-023-02215-x, 2023. A detailed description of the methodology and validation is published in Scherer D., Schwatke C., Dettmering D., Seitz F. : ICESat-2 Based River Surface Slope and Its Impact on Water Level Time Series From Satellite Altimetry. Water Resources Research, 10.1029/2022WR032842, 2022. 1. Summary The unique multibeam lidar altimeter of ICESat-2 is used to measure reach-scale water surface slope (WSS) every time the spacecraft’s orbit crosses a reach. The method of deriving WSS from simultaneous ICESat-2 ATL13 (Jasinski et al., 2021) observations is described in detail and validated in Scherer et al. (2022). In this ICESat-2 River Surface Slope (IRIS) dataset, we provide the minimum, average, and maximum slope derived with three different approaches (across, along, and combined) per reach. Additionally, we give the standard deviation and epochs of the derived WSS data. The reaches are defined by the SWOT River Database (SWORD, Altenau et al., 2021). An interactive map is available at DAHITI. 2. Version History IRIS v0: Only includes the reaches studied in Scherer et al. (2022). Based on ICESat-2 ATL13 v5, Cycle 1-13 (October 2018 to October 2021) and SWORD Version v1. IRIS v1: Global coverage (limited by ICESat-2 data availability and cloud cover). Based on ICESat-2 ATL13 v5, Cycle 1-16 (October 2018 to August 2022) and SWORD Version v2. IRIS v2: Global coverage with 6,083 additional reaches and 92,347 more observations compared to v1. Based on ICESat-2 ATL13 v6, Cycle 1-19 (October 2018 to April 2023) and SWORD Version v15. IRIS v2.1: Based on ICESat-2 ATL13 v6, Cycle 1-19 (October 2018 to April 2023) and SWORD Version v16. IRIS v2.2: 3,251 additional reaches and 58,862 new observations compared to v2.1. Based on ICESat-2 ATL13 v6, Cycle 1-20 (October 2018 to August 2023) and SWORD Version v16. IRIS v2.3: 1,595 additional reaches and 32,590 new observations compared to v2.2. Based on ICESat-2 ATL13 v6, Cycle 1-21 (October 2018 to October 2023) and SWORD Version v16. 3. Data Format and Variable Description The IRIS data is stored in a single NetCDF4 file which is structured in a single group containing the following variables: reach_id: The SWORD reach identifier [-] lon: Approx. centroid longitude of the SWORD reach [degrees east] lat: Approx. centroid latitude of the SWORD reach [degrees north] across_flag, along_flag, combined_flag: Flags indicating whether ICESat-2 [across/along/combined] slope is available (1) for the reach or not (0) [-] avg_across_slope, avg_along_slope, avg_combined_slope: Average (median) ICESat-2 [across/along/combined] slope for the reach [mm/km] min_across_slope, min_along_slope, min_combined_slope: Minimum ICESat-2 [across/along/combined] slope for the reach [mm/km] max_across_slope, max_along_slope, max_combined_slope: Maximum ICESat-2 [across/along/combined] slope for the reach [mm/km] std_across_slope, std_along_slope, std_combined_slope: ICESat-2 [across/along/combined] slope standard deviation for the reach [mm/km] n_across_slope, n_along_slope, n_combined_slope: Number of days with ICESat-2 [across/along/combined] slope observations for the reach [-] min_date_across_slope, min_date_along_slope:, min_date_combined_slope: First date of ICESat-2 [across/along/combined] slope observations for the reach [days since 2000-01-01] max_date_across_slope, max_date_along_slope:, max_date_combined_slope: Latest date of ICESat-2 [across/along/combined] slope observations for the reach [days since 2000-01-01] 4. References Scherer D., Schwatke C., Dettmering D., Seitz F.: ICESat-2 river surface slope (IRIS): A global reach-scale water surface slope dataset. Scientific Data, 10(1), 359, 10.1038/s41597-023-02215-x, 2023 Scherer D., Schwatke C., Dettmering D., Seitz F. (2022): ICESat-2 Based River Surface Slope and Its Impact on Water Level Time Series From Satellite Altimetry, Water Resources Research, https://doi.org/10.1029/2022WR032842 Jasinski M., Stoll J., Hancock D., Robbins J., Nattala J., Morison J., Jones B., Ondrusek M., Pavelsky T.M., Parrish C. and the ICESat-2-Science-Team (2021). ATLAS/ICESat-2 L3A Inland Water Surface Height, Version 5. [Dataset] Altenau E.H., Pavelsky T.M., Durand, M.T., Yang X., Frasson, R.P.d.M., Bendezu, L. (2021): SWOT River Database (SWORD) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.3898569
ICESat-2河道水面坡度（ICESat-2 River Surface Slope, IRIS） 使用本数据集时，请引用以下文献：Scherer D、Schwatke C、Dettmering D、Seitz F. 发表于《Scientific Data》的文章《ICESat-2河道水面坡度（ICESat-2 River Surface Slope, IRIS）：全球河段尺度水面坡度数据集》，2023年，第10卷第1期，第359页，DOI: 10.1038/s41597-023-02215-x。该数据集的方法学细节与验证工作已发表于Scherer D、Schwatke C、Dettmering D、Seitz F. 2022年发表于《Water Resources Research》的文章《基于ICESat-2的河道水面坡度及其对卫星测高水位时间序列的影响》，DOI: 10.1029/2022WR032842。 1. 数据集概况 本数据集利用ICESat-2独有的多波束激光雷达高度计，在航天器轨道跨越河道河段时，逐河段测量河段尺度的水面坡度（Water Surface Slope, WSS）。从同步ICESat-2 ATL13（Jasinski等，2021）观测数据中推导水面坡度的方法，已在Scherer等（2022）中详细阐述并完成验证。 在本数据集中，我们提供了通过横向（across）、纵向（along）以及组合（combined）三种不同方法，为每个河段推导得到的坡度最小值、平均值与最大值。此外，我们还提供了推导得到的水面坡度数据的标准差与观测历元信息。河段的定义基于SWOT河道数据库（SWOT River Database, SWORD, Altenau等，2021）。用户可通过DAHITI访问交互式地图。 2. 版本沿革 IRIS v0：仅包含Scherer等（2022）研究中涉及的河段，基于ICESat-2 ATL13 v5、周期1-13（2018年10月至2021年10月）以及SWORD v1版本构建。 IRIS v1：实现全球覆盖（受限于ICESat-2数据可用性与云量影响），基于ICESat-2 ATL13 v5、周期1-16（2018年10月至2022年8月）以及SWORD v2版本构建。 IRIS v2：相较v1版本新增6083个河段与92347条观测数据，实现全球覆盖，基于ICESat-2 ATL13 v6、周期1-19（2018年10月至2023年4月）以及SWORD v15版本构建。 IRIS v2.1：基于ICESat-2 ATL13 v6、周期1-19（2018年10月至2023年4月）以及SWORD v16版本构建。 IRIS v2.2：相较v2.1版本新增3251个河段与58862条观测数据，基于ICESat-2 ATL13 v6、周期1-20（2018年10月至2023年8月）以及SWORD v16版本构建。 IRIS v2.3：相较v2.2版本新增1595个河段与32590条观测数据，基于ICESat-2 ATL13 v6、周期1-21（2018年10月至2023年10月）以及SWORD v16版本构建。 3. 数据格式与变量说明 IRIS数据集存储为单个NetCDF4文件，其结构为单个组，包含以下变量： reach_id：SWORD河段标识符 [-]（无量纲） lon：SWORD河段近似质心经度 [东经，度] lat：SWORD河段近似质心纬度 [北纬，度] across_flag、along_flag、combined_flag：用于指示该河段是否可获取ICESat-2[横向/纵向/组合]坡度数据的标志，1表示可用，0表示不可用 [-]（无量纲） avg_across_slope、avg_along_slope、avg_combined_slope：该河段ICESat-2[横向/纵向/组合]坡度的平均（中位数）值 [mm/km] min_across_slope、min_along_slope、min_combined_slope：该河段ICESat-2[横向/纵向/组合]坡度的最小值 [mm/km] max_across_slope、max_along_slope、max_combined_slope：该河段ICESat-2[横向/纵向/组合]坡度的最大值 [mm/km] std_across_slope、std_along_slope、std_combined_slope：该河段ICESat-2[横向/纵向/组合]坡度的标准差 [mm/km] n_across_slope、n_along_slope、n_combined_slope：该河段获取ICESat-2[横向/纵向/组合]坡度观测的有效天数 [-]（无量纲） min_date_across_slope、min_date_along_slope、min_date_combined_slope：该河段ICESat-2[横向/纵向/组合]坡度观测的首个日期 [以2000年1月1日为基准的累计天数] max_date_across_slope、max_date_along_slope、max_date_combined_slope：该河段ICESat-2[横向/纵向/组合]坡度观测的最晚日期 [以2000年1月1日为基准的累计天数] 4. 参考文献 1. Scherer D, Schwatke C, Dettmering D, Seitz F. ICESat-2 river surface slope (IRIS): A global reach-scale water surface slope dataset[J]. Scientific Data, 2023, 10(1): 359. DOI: 10.1038/s41597-023-02215-x. 2. Scherer D, Schwatke C, Dettmering D, Seitz F. ICESat-2 Based River Surface Slope and Its Impact on Water Level Time Series From Satellite Altimetry[J]. Water Resources Research, 2022. DOI: 10.1029/2022WR032842. 3. Jasinski M, Stoll J, Hancock D, Robbins J, Nattala J, Morison J, Jones B, Ondrusek M, Pavelsky T M, Parrish C, ICESat-2 Science Team. ATLAS/ICESat-2 L3A Inland Water Surface Height, Version 5[Dataset]. 2021. 4. Altenau E H, Pavelsky T M, Durand M T, Yang X, Frasson R P d M, Bendezu L. SWOT River Database (SWORD)[Dataset]. Zenodo, 2021. DOI: 10.5281/zenodo.3898569.
