European Ground Motion Service: Basic 2016-present (vector), Europe, yearly, Aug. 2022

The European Ground Motion Service (EGMS), part of the Copernicus Land Monitoring Service, provides consistent, regular, standardised, harmonised, and reliable information on natural and anthropogenic ground motion phenomena across Copernicus Participating States and national borders, with millimetre-level accuracy.
This metadata describes the first product level of EGMS: Basic.
EGMS Basic delivers InSAR displacement data in the satellite Line-of-Sight (LOS), accompanied by annotated geolocation and quality indicators for each measurement point. It is derived from full-resolution interferometric analysis of Sentinel-1 radar imagery and includes LOS velocity maps for both ascending and descending orbits. Each measurement is referenced to a local point within the processing unit, meaning ground motion values are only meaningful within that unit and cannot be directly compared across adjacent units.
EGMS Basic is visualised as a vector map of measurement points, colour-coded by average LOS velocity, and distributed in comma-separated values (CSV) format. Each point includes a displacement time series, representing ground motion values for each Sentinel-1 acquisition over the monitoring period.
EGMS Basic is delivered to users on an annual basis, following a five-year moving window update strategy. This means that after the Baseline/first update (2016-2021), the following data periods are available: 2018-2022, 2019-2023 and 2020-2024.

欧洲地表运动服务（European Ground Motion Service, EGMS）是哥白尼陆地监测服务（Copernicus Land Monitoring Service）的组成部分，可为哥白尼参与国及跨国境范围内的自然与人为地表运动现象提供一致、定期、标准化、统一且可靠的信息，精度可达毫米级。
本元数据描述的是EGMS的首个产品层级——基础级（Basic）。
EGMS基础级产品提供卫星视线方向（Line-of-Sight, LOS）上的合成孔径雷达干涉测量（Interferometric Synthetic Aperture Radar, InSAR）位移数据，附带每个测量点的标注地理定位信息与质量指标。该数据源自哨兵-1（Sentinel-1）雷达影像的全分辨率干涉分析，包含升轨与降轨两种轨道下的视线方向速度图。每个测量值均以处理单元内的局部点位为参考基准，这意味着地表运动数值仅在该处理单元内具有意义，无法直接跨相邻单元进行比较。
EGMS基础级产品以测量点矢量地图的形式可视化呈现，按平均视线方向速度进行颜色编码，并以逗号分隔值（Comma-Separated Values, CSV）格式分发。每个测量点均包含位移时间序列，代表监测期内每一次哨兵-1过境采集对应的地表运动数值。
EGMS基础级产品采用五年移动窗口更新策略，按年度向用户交付。在基准/首次更新（2016-2021年）后，后续可用的数据时段包括：2018-2022年、2019-2023年及2020-2024年。