Coverage masks for the Sentinel-2 next generation mission

This repository contains the initial requirements for Copernicus Sentinel-2 Next Generation (S2NG) spatial coverage masks for various observation scenarios. These masks must be considered as "to be confirmed" and will be subject to change. These masks are provided in support of the first release of the S2NG mission requirements document. The S2NG mission is under development and is currently planned to launch in the mid-2030's. There are five masks provided:1) The HLOP mask [MRD-0050], specifying the proposed default daytime coverage of S2NG and providing baseline continuity with S2 First Generation.2) The EEZ mask [MRD-0050], specifying the proposed extended daytime coverage across the maritime EEZ. This mask is based upon the masks provided by the Flanders Marine Institute (2019), available online at: https://www.marineregions.org/ and https://doi.org/10.14284/3863) The gas flare mask [MRD-0072], specifying the proposed coverage for S2NG at night in support of oil/gas flare monitoring. This mask is derived from gas flare detections by the VIIRS instrument flying aboard NOAA's SNPP and JPSS missions.4) The twilight mask [MRD-0075], specifying the proposed high SZA coverage for S2NG in support of marine monitoring, specifically sea ice detection.5) The Near-Realtime mask [MRD-0240, -0250], specifying the proposed coverage over which data shall be acquired with NRT latency. The coverage masks are provided in both shapefile and geoJSON format. In addition, PNG files are provided to give a graphical overview of each coverage mask.Furthermore, for the gas flare mask a CSV is provided that contains the lat/lon of each flare included in the mask. This dataset represented the combined work of the Sentinel-2 Next Generation Mission Advisory Group and the High Level Operations Plan for the Sentinel-2 First Generation mission.本仓库包含针对多种观测场景的哥白尼哨兵二号下一代（Copernicus Sentinel-2 Next Generation, S2NG）空间覆盖掩码的初始需求。此类掩码暂定为“待确认”状态，后续可能发生变更。本次提供的掩码旨在支撑S2NG任务需求文档的首次发布。 S2NG任务目前处于研发阶段，计划于2030年代中期发射。 本次共提供5款覆盖掩码： 1. 高级运行计划（High Level Operations Plan, HLOP）掩码[MRD-0050]：明确了S2NG拟采用的默认日间覆盖范围，旨在与初代哨兵二号（Sentinel-2 First Generation）任务保持基线连续性。 2. 专属经济区（Exclusive Economic Zone, EEZ）掩码[MRD-0050]：明确了S2NG拟在海洋专属经济区范围内扩展的日间覆盖范围。该掩码基于法兰德斯海洋研究所2019年提供的掩码制作，相关资源可通过以下网址获取：https://www.marineregions.org/ 及 https://doi.org/10.14284/386 3. 油气火炬检测掩码[MRD-0072]：明确了S2NG拟用于夜间油气火炬监测的覆盖范围。该掩码源自搭载于美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）的SNPP与JPSS任务的可见光红外成像辐射仪（Visible Infrared Imaging Radiometer Suite, VIIRS）所探测到的油气火炬数据。 4. 暮光时段掩码[MRD-0075]：明确了S2NG拟采用的高太阳天顶角（Solar Zenith Angle, SZA）覆盖范围，用于支撑海洋监测任务，特别是海冰探测。 5. 近实时（Near-Realtime, NRT）掩码[MRD-0240、-0250]：明确了S2NG拟采用近实时延迟模式获取数据的覆盖范围。 本数据集提供的覆盖掩码均采用形状文件（Shapefile）与地理JSON（geoJSON）两种格式。此外，还提供了各覆盖掩码的PNG可视化预览文件。针对油气火炬检测掩码，额外附带了包含掩码内所有火炬经纬度信息的CSV文件。 本数据集由哨兵二号下一代任务咨询组与初代哨兵二号任务高级运行计划工作组联合制作完成。