该网站提供几乎整个地球的卫星视图，可按位置和日期连续访问，从而可以轻松跟踪任何演变。
哥白尼哨兵星座是由欧洲航天局 (ESA) 和欧盟设计和运营的一组专用地球观测卫星。它们是哥白尼计划的“空间组成部分”，哥白尼计划是世界上最雄心勃勃的民用地球观测计划，提供免费开放的数据，以帮助监测环境、了解地球运行状况。 气候变化并确保公民安全。
之所以使用“星座”一词，是因为大多数哨兵卫星任务都由两颗相同的卫星组成，它们在同一轨道上运行，但彼此相距180°。这种设置确保地球的每个部分都能被频繁扫描（高“重访周期”），这对于追踪洪水或作物生长等快速变化的事件至关重要。
这里提供的数据来自 Sentinel-2（光学成像），它可以捕捉地球表面的高分辨率“彩色”图像（多光谱），非常适合农业（监测作物健康状况）、林业、土地利用测绘以及管理野火等自然灾害。
如果目标是找到最小的细节，那么分辨率可能不是最令人印象深刻的，但它与其他工具非常互补，是分析大范围区域随时间变化的强大研究资源。
根据地区和日期，可能会有多个图层可用，从真实颜色到 SWIR、NDVI、NDWI 等，可与云滤镜一起使用以获得最佳效果。
| 地球卫星视图（欧盟哥白尼哨兵星座） | Google Earth Engine | 行星探索者 | USGS EarthExplorer |
|---|---|---|---|
| Data and resolution: Copernicus Browser offers Sentinel-1, Sentinel-2 (L1C and L2A), Sentinel-3, Sentinel-5P and two DEMs. Sentinel-2 has 13 bands, four at 10 m, six at 20 m and three at 60 m, with a combined revisit of 5 days for the 2A and 2B pair. | Data and resolution: A cloud platform for analysis of large public geospatial catalogues and your own data. Resolution depends on the dataset chosen. | Data and resolution: PlanetScope at about 3 m with near daily coverage, and SkySat at about 1 m. Finer resolution than Sentinel-2, but from a commercial source. | Data and resolution: Datasets include Landsat, MODIS, radar, DEMs, LiDAR, aerial and commercial imagery, and Sentinel-2 is also available. |
| 分析工具： Custom band composites, indices such as NDVI (bands B4 and B8) and NDWI, custom JavaScript visualization scripts, a cloud filter (30 percent by default) and time-lapse export to GIF or MP4. Services can be exposed as WMS, WMTS, WFS or WCS. | 分析工具： Programmatic processing over the whole catalogue, billed in compute hours for commercial use. This suits large-scale time series, but it needs scripting skills. | 分析工具： Search, filter and preview of scenes in the browser, with download and API access for subscribers. | 分析工具： Search and download of scenes, with footprints in CSV, shapefile or KMZ. Processing is done offline in your own software. Level 1 GeoTIFF is the usual analysis product. |
| 成本和获取途径： Free, with a free account required for the browser. No commercial licence is needed. | 成本和获取途径： Noncommercial and research use is free. Commercial plans are offered as Basic and Professional subscriptions, plus usage fees per compute hour. | 成本和获取途径： Paid plans. Daily monitoring is sold on contract. | 成本和获取途径： Downloads are free with a free USGS account. |
| Learning curve: Low for viewing and index maps, moderate for custom scripts. A good starting point for agronomists, foresters and environmental scientists. | Learning curve: High, because analysis is written as code. | Learning curve: Low for browsing, moderate for API work. | Learning curve: Moderate: you must choose products and processing levels, then handle files yourself. |
| 何时选择它： Choose it for free, repeatable monitoring of large areas over time, such as crop health, burn scars, flooding or land use, when 10 m detail is sufficient. | 何时选择它： Choose it when you must process years of imagery across large regions. | 何时选择它： Choose it when metre-scale detail and frequent revisits justify a commercial budget. | 何时选择它： Choose it when you need Landsat archives or other US federal data products. |
涵盖的主题： 地球观测、哥白尼计划、哨兵卫星、多光谱成像、高重访周期、环境监测、气候变化、农业监测、土地利用制图、自然灾害管理、光学成像、遥感、短波红外、归一化植被指数 (NDVI)、归一化植被指数 (NDWI)、云过滤、数据可访问性、自由开放数据 ISO 19115、ISO 19130、ISO 19157、ISO 19139 和 ISO 19126。
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