Burn Scar - Corrected Reflectance (VIIRS / Suomi-NPP)

Visualization Overview This visualization represents a global "false color" band combination (Red = M11, Green = I2, Blue = I1) of data collected by the VIIRS instrument on the joint NASA/NOAA Suomi-NPP satellite from late year 2015 - present. The intended use of the imagery is for distinguishing burn scars from naturally low vegetation or bare soil and enhancing floods. At its highest resolution, this visualization represents the underlying data scaled to a resolution of 250m per pixel at the equator. The VIIRS Corrected Reflectance product retains visible aerosols for a natural-looking visualization, though gross atmospheric effects (e.g. Rayleigh scattering) have been removed. The following guidelines will aid in understanding this visualization. See here for additional information on how this "false color" band combination highlights these physical characteristics of the Earth. Vegetation will appear bright green. Naturally bare soil, like a desert, will often appear to have a pinkish tinge. Burned areas (a.k.a. "burn scars") will appear as deep or bright red, depending on the type of vegetation burned, the amount of residue, or the completeness of the burn. Liquid water on the ground will appear dark blue while ice and snow will appear as bright turquoise. Clouds lower to the ground will appear white while high, and cold, clouds will appear turquoise. Multi-Spectral Bands The following table lists the VIIRS bands that are utilized to create this visualization. See here for a full description of all VIIRS bands. Band Description Wavelength (µm) Resolution (m) I1 Visible / Reflective (Red) 0.60 - 0.68 375 I2 Near IR (Green) 0.85 - 0.88 375 M11 Shortwave IR 2.23 - 2.28 750 Temporal Coverage and Limitations of Use By default, this layer will display the imagery currently available for today’s date. The update frequency is a "daily composite" that is assembled from hundreds of individual data files. When viewing imagery for “today,” you may notice that only a portion of the map has imagery. This is because the visualization is continually updated as the satellite collects more data. To view imagery over time, you can update the layer properties to enable time animation and configure time settings. Currently, this layer is available from present back to November 24th, 2015. In the coming months, this will be extended to the start of the mission (October 28th, 2011). Source: NASA Global Imagery Browse Services (GIBS), NASA Worldview, & NASA LANCE This visualization is provided through the NASA Global Imagery Browse Services (GIBS), which are a set of standard services to deliver global, full-resolution satellite imagery for hundreds of NASA Earth science datasets and science parameters. Through its services, and the NASA Worldview client, GIBS enables interactive exploration of NASA's Earth imagery for a broad range of users. The data and imagery are generated within 3 hours of acquisition through the NASA LANCE capability. Esri and NASA Collaborative Services This visualization is made available through an ArcGIS image service hosted on Esri servers and facilitates access to a NASA GIBS service endpoint. For each image service request, the Esri server issues multiple requests to the GIBS service, processes and assembles the responses, and returns a proper mosaic image to the user. Processing occurs on-the-fly for each and every request to ensure that any update to the GIBS imagery is immediately available to the user. As such, availability of this visualization is dependent on both the Esri and the NASA GIBS services.可视化概览 本可视化展示了由美国国家航空航天局（NASA）与美国国家海洋和大气管理局（NOAA）联合研制的苏奥米-NPP（Suomi-NPP）卫星搭载的VIIRS（可见光红外成像辐射仪，Visible Infrared Imaging Radiometer Suite）于2015年末至今采集的数据所生成的全球"假彩色"波段合成影像（红色通道对应M11波段、绿色通道对应I2波段、蓝色通道对应I1波段）。 本影像的设计用途为区分火烧迹地与天然低矮植被或裸土，并增强洪涝场景的辨识度。在最高分辨率下，本可视化采用赤道处每像素250米的缩放比例还原原始数据。 VIIRS校正反射率产品保留了可见气溶胶以呈现自然的可视化效果，同时已去除显著大气效应（如瑞利散射）。以下指南将帮助您理解本可视化内容，点击此处可获取该"假彩色"波段组合如何凸显地球物理特征的更多信息。 植被将呈现亮绿色；天然裸土（如沙漠）通常带有粉调；燃烧区域（亦称"火烧迹地"）则根据被烧植被类型、残留量或燃烧完全度，呈现深红或亮红色；地表液态水呈深蓝色，而冰雪则呈现明亮青绿色。地面低空云呈白色，高空冷云则呈青绿色。 多光谱波段 下表列出了用于生成本可视化的VIIRS波段，点击此处可查看所有VIIRS波段的完整说明。 | 波段 | 波段描述 | 波长（µm） | 分辨率（m） | |------|----------|-----------|-----------| | I1 | 可见光/反射型（红色通道） | 0.60 - 0.68 | 375 | | I2 | 近红外（绿色通道） | 0.85 - 0.88 | 375 | | M11 | 短波红外 | 2.23 - 2.28 | 750 | 时间覆盖范围与使用限制 默认情况下，本图层将显示当前日期可用的最新影像。其更新频率为每日合成产品，由数百份独立数据文件拼接而成。当查看"今日"影像时，您可能会发现地图仅部分区域有影像，这是因为卫星持续采集数据，可视化内容也随之不断更新。若需查看历史影像，可通过更新图层属性启用时间动画并配置时间参数。 目前本图层的可用时间范围为2015年11月24日至今，未来数月内将扩展至任务起始日期（2011年10月28日）。 数据来源：NASA全球影像浏览服务（GIBS，Global Imagery Browse Services）、NASA Worldview与NASA LANCE 本可视化通过NASA全球影像浏览服务（GIBS）提供，该服务提供标准化接口，可交付数百套NASA地球科学数据集与科学参数的全球全分辨率卫星影像。通过其服务与NASA Worldview客户端，GIBS可为广泛用户群体提供NASA地球影像的交互式探索功能。数据与影像在采集后3小时内通过NASA LANCE功能完成生成。 Esri与NASA联合服务 本可视化通过部署于Esri服务器的ArcGIS影像服务提供，该服务对接了NASA GIBS服务端点。每一次影像服务请求都会由Esri服务器向GIBS服务发起多条请求，对响应结果进行处理与拼接后，向用户返回完整的镶嵌影像。所有请求均实时处理，以确保GIBS影像的任何更新均可立即对用户可用。因此，本可视化的可用性同时依赖于Esri与NASA GIBS两项服务。