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).

基于NOAA-20（原名JPSS-1）近实时（NRT）可见光红外成像仪（VIIRS）主动火灾探测仪套件的数据，该套件基于仪器375米的名义分辨率数据。与其它分辨率较粗（≥1公里）的卫星火灾探测产品相比，改进后的375米数据在相对较小面积的火灾响应方面提供了更大的覆盖范围，同时提高了大面积火灾边界的映射精度。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度的科学应用。375米产品与基线Suomi NPP/VIIRS 750米主动火灾探测和特征化数据相辅相成，后者最初设计用于延续现有的1公里地球观测系统中高分辨率成像光谱仪（EOS/MODIS）的主动火灾数据记录。鉴于数据饱和问题频发，当前的375米火灾产品仅提供检测信息，而不包含亚像素火灾特征化。

VJ114IMGTDL_NRT数据以TXT、SHP、KML、WMS等格式提供。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，请参阅：VJ114IMG_NRT。

建议阅读：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）。