VIIRS NOAA-20 (JPSS-1) 375m, I-Band Active Fire Product NRT (Vector Data)

Near real-time (NRT) NOAA-20 (formally JPSS-1) Visible Infrared Imaging Radiometer Suite (VIIRS) Active Fire detection product is based on the instrument's 375 m nominal resolution data. Compared to other coarser resolution (≥1km) satellite fire detection products, the improved 375 m data provide greater response over fires of relatively small areas, as well as improved mapping of large fire perimeters. Consequently, the data are well suited for use in support of fire management (e.g., near real-time alert systems), as well as other science applications requiring improved fire mapping fidelity. The 375 m product complements the baseline Suomi NPP/VIIRS 750 m active fire detection and characterization data, which was originally designed to provide continuity to the existing 1 km Earth Observing System Moderate Resolution Imaging Spectroradiometer (EOS/MODIS) active fire data record. Due to frequent data saturation issues, the current 375 m fire product provides detection information only with no sub-pixel fire characterization.

VJ114IMGTDL_NRT are available in the following formats: TXT, SHP, KML, WMS. These data are also provided through the LANCE FIRMS Fire Email Alerts. Please note only the TXT and SHP files contain all the attributes. For the HDF version see: VJ114IMG_NRT

Recommended reading: VIIRS 375m Active Fire Algorithm User Guide (https://earthdata.nasa.gov/files/VIIRS_375m_Users_guide_Dec15_v2.pdf) (updated December 2015).

近实时（NRT）NOAA-20（原称JPSS-1）可见光红外成像辐射计套件（VIIRS）主动火灾检测产品基于该仪器375米标准分辨率数据。相较于其他较粗分辨率（≥1公里）卫星火灾检测产品，改进的375米数据在相对较小面积的火灾响应上提供了更优性能，以及在大面积火灾周边的映射上得到显著提升。因此，这些数据非常适合用于支持火灾管理（例如，近实时警报系统）以及其他需要提高火灾映射精确度的科学应用。375米产品与基线Suomi NPP/VIIRS 750米主动火灾检测与表征数据相辅相成，后者最初设计旨在延续现有1公里地球观测系统中高分辨率成像光谱辐射计（EOS/MODIS）的主动火灾数据记录。鉴于数据饱和问题的频繁发生，当前375米火灾产品仅提供检测信息，而不包含亚像素级火灾表征。

VJ114IMGTDL_NRT数据以TXT、SHP、KML、WMS格式提供。这些数据亦可通过LANCE FIRMS火灾电子邮件警报系统获取。请注意，仅TXT和SHP文件包含所有属性。有关HDF版本的信息，请参阅VJ114IMG_NRT。

推荐阅读：VIIRS 375米主动火灾算法用户指南（https://earthdata.nasa.gov/files/VIIRS_375m_Users_guide_Dec15_v2.pdf）（更新于2015年12月）。