Satellite (MODIS) Thermal Hotspots and Fire Activity

This layer presents detectable thermal activity from MODIS satellites for the last 7 days. MODIS Global Fires is a product of NASA’s Earth Observing System Data and Information System (EOSDIS), part of NASA's Earth Science Data. EOSDIS integrates remote sensing and GIS technologies to deliver global MODIS hotspot/fire locations to natural resource managers and other stakeholders around the World. Consumption Best Practices: As a service that is subject to very high usage, ensure peak performance and accessibility of your maps and apps by avoiding the use of non-cacheable relative Date/Time field filters. To accommodate filtering events by Date/Time, we suggest using the included "Age" fields that maintain the number of days or hours since a record was created or last modified, compared to the last service update. These queries fully support the ability to cache a response, allowing common query results to be efficiently provided to users in a high demand service environment. When ingesting this service in your applications, avoid using POST requests whenever possible. These requests can compromise performance and scalability during periods of high usage because they too are not cacheable. Source: NASA FIRMS - Active Fire Data - for World Scale/Resolution: 1km Update Frequency: 1/2 Hour (every 30 minutes) using the Aggregated Live Feed Methodology Area Covered: World What can I do with this layer? The MODIS thermal activity layer can be used to visualize and assess wildfires worldwide. However, it should be noted that this dataset contains many “false positives” (e.g., oil/natural gas wells or volcanoes) since the satellite will detect any large thermal signal. Additional Information MODIS stands for MODerate resolution Imaging Spectroradiometer. The MODIS instrument is on board NASA’s Earth Observing System (EOS) Terra (EOS AM) and Aqua (EOS PM) satellites. The orbit of the Terra satellite goes from north to south across the equator in the morning and Aqua passes south to north over the equator in the afternoon resulting in global coverage every 1 to 2 days. The EOS satellites have a ±55 degree scanning pattern and orbit at 705 km with a 2,330 km swath width. It takes approximately 2 – 4 hours after satellite overpass for MODIS Rapid Response to process the data, and for the Fire Information for Resource Management System (FIRMS) to update the website. Occasionally, hardware errors can result in processing delays beyond the 2-4 hour range. Additional information on the MODIS system status can be found at MODIS Rapid Response. Attribute Information Latitude and Longitude: The center point location of the 1km (approx.) pixel flagged as containing one or more fires/hotspots (fire size is not 1km, but variable). Stored by Point Geometry. See What does a hotspot/fire detection mean on the ground? Brightness: The brightness temperature measured (in Kelvin) using the MODIS channels 21/22 and channel 31. Scan and Track: The actual spatial resolution of the scanned pixel. Although the algorithm works at 1km resolution, the MODIS pixels get bigger toward the edge of the scan. See What does scan and track mean? Date and Time: Acquisition date of the hotspot/active fire pixel and time of satellite overpass in UTC (client presentation in local time). Stored by Acquisition Date. Acquisition Date: Derived Date/Time field combining Date and Time attributes. Satellite: Whether the detection was picked up by the Terra or Aqua satellite. Confidence: The detection confidence is a quality flag of the individual hotspot/active fire pixel. Version: Version refers to the processing collection and source of data. The number before the decimal refers to the collection (e.g. MODIS Collection 6). The number after the decimal indicates the source of Level 1B data; data processed in near-real time by MODIS Rapid Response will have the source code “CollectionNumber.0”. Data sourced from MODAPS (with a 2-month lag) and processed by FIRMS using the standard MOD14/MYD14 Thermal Anomalies algorithm will have a source code “CollectionNumber.x”. For example, data with the version listed as 5.0 is collection 5, processed by MRR, data with the version listed as 5.1 is collection 5 data processed by FIRMS using Level 1B data from MODAPS. Bright.T31: Channel 31 brightness temperature (in Kelvins) of the hotspot/active fire pixel. FRP: Fire Radiative Power. Depicts the pixel-integrated fire radiative power in MW (MegaWatts). FRP provides information on the measured radiant heat output of detected fires. The amount of radiant heat energy liberated per unit time (the Fire Radiative Power) is thought to be related to the rate at which fuel is being consumed (Wooster et. al. (2005)). DayNight: The standard processing algorithm uses the solar zenith angle (SZA) to threshold the day/night value; if the SZA exceeds 85 degrees it is assigned a night value. SZA values less than 85 degrees are assigned a day time value. For the NRT algorithm the day/night flag is assigned by ascending (day) vs descending (night) observation. It is expected that the NRT assignment of the day/night flag will be amended to be consistent with the standard processing. Hours Old: Derived field that provides age of record in hours between Acquisition date/time and latest update date/time. 0 = less than 1 hour ago, 1 = less than 2 hours ago, 2 = less than 3 hours ago, and so on. Revisions June 22, 2022: Added 'HOURS_OLD' field to enhance Filtering data. Added 'Last 7 days' Layer to extend data to match time range of VIIRS offering. Added Field level descriptions. This map is provided for informational purposes and is not monitored 24/7 for accuracy and currency. If you would like to be alerted to potential issues or simply see when this Service will update next, please visit our Live Feed Status Page!本图层展示了过去7天内搭载中分辨率成像光谱辐射计（MODerate resolution Imaging Spectroradiometer，MODIS）的卫星探测到的可追踪热活动信息。MODIS全球火情（MODIS Global Fires）是美国国家航空航天局（National Aeronautics and Space Administration，NASA）地球观测系统数据与信息系统（Earth Observing System Data and Information System，EOSDIS）的产品之一，隶属于NASA地球科学数据体系。EOSDIS整合遥感与地理信息系统（Geographic Information System，GIS）技术，向全球自然资源管理者及其他利益相关方提供全球MODIS热点/火情位置数据。 使用最佳实践：本服务的使用量极高，为确保地图与应用程序的峰值性能与可访问性，请避免使用不可缓存的相对日期/时间字段过滤器。若需按日期/时间筛选事件，我们建议使用附带的“Age”字段，该字段会记录记录创建或最后修改时间距服务最近一次更新的天数或小时数。此类查询完全支持响应缓存，可在高并发服务环境中高效向用户返回常用查询结果。在你的应用中集成本服务时，请尽可能避免使用POST请求。此类请求不可缓存，在高使用时段可能会损害服务性能与可扩展性。 数据来源：NASA火灾信息资源管理系统（Fire Information for Resource Management System，FIRMS）——全球范围活跃火情数据 空间分辨率：1km 更新频率：每半小时（30分钟），采用聚合实时馈送（Aggregated Live Feed）方法学 覆盖区域：全球 本图层可用于哪些场景？MODIS热活动图层可用于可视化并评估全球范围内的野火情况。但需注意，本数据集存在较多“假阳性”结果（例如石油/天然气井或火山），因为卫星会探测到任何大型热信号。 补充信息：MODIS是中分辨率成像光谱辐射计（MODerate resolution Imaging Spectroradiometer）的缩写。该仪器搭载于NASA地球观测系统（Earth Observing System，EOS）的Terra（EOS AM）与Aqua（EOS PM）两颗卫星上。Terra卫星轨道在上午从北向南穿越赤道，Aqua卫星则在下午从南向北飞越赤道，因此两颗卫星可每1至2天完成一次全球覆盖。EOS卫星的扫描幅角为±55度，轨道高度为705公里，扫描带宽度达2330公里。卫星过境后，MODIS快速响应系统（MODIS Rapid Response）约需2至4小时处理数据，火灾信息资源管理系统（FIRMS）也会同步更新其网站。偶尔会因硬件故障导致处理延迟超过2-4小时。有关MODIS系统状态的更多信息可访问MODIS快速响应平台。 属性信息： 纬度与经度：标记为包含一处或多处火情/热点的约1km像素中心点位置（火情规模并非固定1km，而是可变的）。以点几何格式存储。详见“热点/火情探测在地面意味着什么？” 亮度：通过MODIS第21/22波段与第31波段测得的亮度温度，单位为开尔文（Kelvin）。 扫描角与航迹角（Scan and Track）：扫描像素的实际空间分辨率。尽管算法以1km分辨率运行，但MODIS像素在扫描带边缘会变大。详见“扫描角与航迹角是什么意思？” 日期与时间：热点/活跃火情像素的采集日期与卫星过境的UTC时间（客户端将以本地时间展示）。以采集日期字段存储。 采集日期：整合日期与时间属性的派生日期/时间字段。 卫星：探测结果是由Terra还是Aqua卫星捕获的。 置信度：单个热点/活跃火情像素的质量标记。 版本：版本号指数据的处理集合与来源。小数点前的数字代表数据集合（例如MODIS Collection 6）；小数点后的数字代表1B级数据的来源：由MODIS快速响应系统近实时处理的数据，其来源代码为“CollectionNumber.0”；延迟2个月从MODAPS获取数据并由FIRMS使用标准MOD14/MYD14热异常算法处理的数据，其来源代码为“CollectionNumber.x”。例如，版本号为5.0的数据代表由MODIS快速响应系统处理的第5集合数据，版本号为5.1的数据代表由FIRMS使用MODAPS获取的1B级数据处理得到的第5集合数据。 Bright.T31：热点/活跃火情像素的第31波段亮度温度，单位为开尔文。 火灾辐射功率（Fire Radiative Power，FRP）：以兆瓦（MegaWatts，MW）为单位的像素集成火灾辐射功率。FRP可反映探测到的火情的辐射热输出情况。单位时间内释放的辐射热能量（即火灾辐射功率）被认为与燃料消耗速率相关（Wooster等人，2005年）。 昼夜标识：标准处理算法使用太阳天顶角（Solar Zenith Angle，SZA）来判定昼夜标识：若太阳天顶角超过85度，则标记为夜间；若太阳天顶角小于85度，则标记为白天。对于近实时处理算法，昼夜标识通过升轨（白天）与降轨（夜间）观测来分配。未来将对近实时算法的昼夜标识分配方式进行修正，以与标准处理流程保持一致。 Hours Old：派生字段，用于记录采集日期/时间距最近一次更新日期/时间的时长，单位为小时。0代表距今不足1小时，1代表距今不足2小时，2代表距今不足3小时，以此类推。 修订记录：2022年6月22日：新增“HOURS_OLD”字段以优化数据筛选功能；新增“过去7天”图层以扩展数据时间范围，使其与可见光红外成像辐射仪套件（Visible Infrared Imaging Radiometer Suite，VIIRS）产品的时间范围保持一致；新增字段级描述信息。 本地图仅用于提供信息参考，并未全天候监控其准确性与时效性。若你希望接收潜在问题警报或了解本服务的下次更新时间，请访问我们的实时馈送状态页面！