Maps of land surface phenology derived from PlanetScope data, 2018-2022, Teller, Kougarok, and Council, Seward Peninsula

Remote sensing maps of land surface phenology derived from PlanetScope (Planet Team, 2017) normalized differential greenness index (NDGI; Yang et al., 2019) time series data. These maps include four phenological timing metric - start of spring (SOS), end of spring (EOS), start of fall (SOF), and end of fall (EOF), corresponding NDGI value at the four phenological timings, and annual maximum and minimum NDGI. This package includes maps for Next-Generation Ecosystem Experiment Arctic (NGEE Arctic)’s Teller Mile Marker (MM) 27, Kougarok MM64, and Council MM 71 watersheds. Maps of 5 years from 2018 to 2022 are included in this dataset. The map data and metadata are provided as image (ENVI) and text (*.txt, *hdr) formats. Additional supporting map quicklooks are provided as GIS *.kml files. These datasets are provided in support of Yang et al., (In revision) “Fine-scale Landscape Characteristics, Vegetation Composition, and Snowmelt Timing Control Phenological Heterogeneity across Arctic Tundra Landscapes” The Next-Generation Ecosystem Experiments: Arctic (NGEE Arctic), was a research effort to reduce uncertainty in Earth System Models by developing a predictive understanding of carbon-rich Arctic ecosystems and feedbacks to climate. NGEE Arctic was supported by the Department of Energy's Office of Biological and Environmental Research. The NGEE Arctic project had two field research sites: 1) located within the Arctic polygonal tundra coastal region on the Barrow Environmental Observatory (BEO) and the North Slope near Utqiagvik (Barrow), Alaska and 2) multiple areas on the discontinuous permafrost region of the Seward Peninsula north of Nome, Alaska. Through observations, experiments, and synthesis with existing datasets, NGEE Arctic provided an enhanced knowledge base for multi-scale modeling and contributed to improved process representation at global pan-Arctic scales within the Department of Energy's Earth system Model (the Energy Exascale Earth System Model, or E3SM), and specifically within the E3SM Land Model component (ELM).

基于PlanetScope（Planet团队，2017）获取的归一化差异绿度指数（Normalized Differential Greenness Index，NDGI；Yang等，2019）时间序列数据生成的陆地物候遥感影像图。此类影像图包含4种地物物候期时序指标——春季始期（Start of Spring，SOS）、春季终期（End of Spring，EOS）、秋季始期（Start of Fall，SOF）与秋季终期（End of Fall，EOF），对应4个物候节点的NDGI值，以及年度NDGI最大值与最小值。本数据集包含北极下一代生态系统实验（Next-Generation Ecosystem Experiment Arctic，NGEE Arctic）研究区内特勒尔27号里程标、库加罗克64号里程标以及康瑟尔71号里程标流域的相关影像图，涵盖2018至2022年共5年的影像数据。本数据集以ENVI格式影像与文本（*.txt、*.hdr）格式提供影像数据及元数据，额外附带的影像快速预览图则以GIS格式*.kml文件提供。本数据集为支持Yang等（待刊）《北极苔原景观中精细尺度景观特征、植被组成与融雪时序调控物候异质性》一文而发布。北极下一代生态系统实验（Next-Generation Ecosystem Experiments: Arctic，NGEE Arctic）是一项旨在通过深化对富碳北极生态系统及其气候反馈机制的预测性认知，以降低地球系统模型不确定性的研究项目。该项目由美国能源部生物与环境研究办公室资助。NGEE Arctic项目设有两个野外研究站点：1）位于阿拉斯加州乌特恰维克（原名为巴罗）附近的北坡地区及巴罗环境观测站（Barrow Environmental Observatory，BEO）内的北极多边形苔原海岸带；2）位于阿拉斯加州诺姆以北的苏厄德半岛不连续多年冻土区的多个区域。通过观测、实验以及与现有数据集的综合分析，NGEE Arctic项目为多尺度建模提供了更为完善的知识库，并助力美国能源部地球系统模型——能量极端尺度地球系统模型（Energy Exascale Earth System Model，E3SM），尤其是其陆面模式模块（E3SM Land Model，ELM）——在全球泛北极尺度上提升了过程表征能力。