VIIRS/JPSS1 Active Fires 6-Min L2 Swath 375m NRT

The VJ114IMG_NRT is a Near Real Time (NRT) NOAA-20 (formally JPSS-1) /VIIRS 375 m active fire detection data product. 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. Due to frequent data saturation issues, the current 375 m fire product provides detection information only with no sub-pixel fire characterization.

The algorithm uses all five 375 m VIIRS channels to detect fires and separate land, water, and cloud pixels in the image. Additional 750 m channels complement the available VIIRS multispectral data. Those channels are used as input to the baseline active fire detection product, which provides continuity to the EOS/MODIS 1 km Fire and Thermal Anomalies product.

The VIIRS 375 m fire detection data is a Level 2 product based on the input Science Data Record (SDR) Level 1 swath format. The NRT product is currently available through NASA's Land, Atmosphere Near real-time Capability for EOS (LANCE). The data are formatted as NetCDF4 files. Complementary ASCII files containing the short list of fire pixels detected are also available through LANCE FIRMS processing systems.

For more information read VIIRS 375 m Active Fire Algorithm User Guide at https://earthdata.nasa.gov/files/VIIRS_375m_Users_guide_Dec15_v2.pdf

and

Schroeder, W., Oliva, P., Giglio, L., & Csiszar, I. A. (2014). The New VIIRS 375m active fire detection data product: algorithm description and initial assessment. Remote Sensing of Environment, 143, 85-96. doi:10.1016/j.rse.2013.12.008 PDF from UMD

or

visit University of Maryland VIIRS Active Fire Web page at http://viirsfire.geog.umd.edu/

VJ114IMG_NRT 为近实时（NRT）NOAA-20（原JPSS-1）/VIIRS 375米主动火灾探测数据产品。相较于其他分辨率较粗（≥1公里）的卫星火灾探测产品，改进的375米数据能够在相对较小区域的火灾中提供更快的响应，并优化大火灾边缘的映射。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。由于数据饱和问题频繁发生，当前的375米火灾产品仅提供探测信息，而不包含亚像素火灾特征描述。算法利用了所有五个375米VIIRS通道来探测火灾，并分离图像中的陆地、水域和云层像素。额外的750米通道补充了可用的VIIRS多光谱数据，这些通道作为基线主动火灾探测产品的输入，为EOS/MODIS 1公里火灾和热异常产品提供连续性。VIIRS 375米火灾探测数据是一个基于输入科学数据记录（SDR）1级条带格式的2级产品。近实时产品目前可通过NASA的EOS陆地、大气近实时能力（LANCE）获取。数据格式为NetCDF4文件。通过LANCE FIRMS处理系统，还提供了包含所探测火灾像素简短列表的补充ASCII文件。有关更多信息，请参阅https://earthdata.nasa.gov/files/VIIRS_375m_Users_guide_Dec15_v2.pdf以及Schroeder, W., Oliva, P., Giglio, L., & Csiszar, I. A. (2014). 新的VIIRS 375米主动火灾探测数据产品：算法描述及初步评估。Remote Sensing of Environment, 143, 85-96. doi:10.1016/j.rse.2013.12.008 PDF from UMD或访问马里兰大学VIIRS主动火灾网页http://viirsfire.geog.umd.edu/