VIIRS/JPSS1 Active Fires 6-Min L2 Swath 375m NRT
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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是近实时（Near Real Time, NRT）级别的NOAA-20（前身为JPSS-1）/可见光红外成像辐射仪套件（Visible Infrared Imaging Radiometer Suite, VIIRS）375米分辨率主动火点探测数据集。相较于其他分辨率≥1km的粗分辨率卫星火点探测产品，这款优化后的375米分辨率数据对小型火点的响应能力更强，同时可更精准地勾勒大型火点的边界。因此，该数据集非常适用于火灾管理相关工作（如近实时预警系统），以及其他对火点制图保真度有更高要求的科学研究应用。由于频繁存在数据饱和问题，当前的375米火点产品仅能提供火点探测信息，无法实现亚像素火点特征表征。 该算法依托VIIRS全部5个375米分辨率通道完成火点探测，并可区分影像中的陆地、水体与云像元。额外配置的750米分辨率通道可补充VIIRS多光谱数据集。上述通道被作为基线主动火点探测产品的输入数据，该产品可延续EOS/MODIS 1公里火点与热异常产品的观测连续性。 VIIRS 375米火点探测数据属于二级产品，其输入格式为科学数据记录（Science Data Record, SDR）一级条带格式。目前该近实时产品可通过NASA的EOS近实时陆地大气服务能力（Land, Atmosphere Near real-time Capability for EOS, LANCE）平台获取。数据采用NetCDF4文件格式存储。此外，包含筛选后的火点像元列表的配套ASCII文件，也可通过LANCE FIRMS处理系统获取。 如需获取更多信息，请参阅《VIIRS 375米主动火点算法用户指南》，链接为https://earthdata.nasa.gov/files/VIIRS_375m_Users_guide_Dec15_v2.pdf。 Schroeder, W., Oliva, P., Giglio, L., & Csiszar, I. A. (2014). 新型VIIRS 375米主动火点探测数据集：算法描述与初步评估. 《环境遥感》（Remote Sensing of Environment）, 143, 85-96. DOI:10.1016/j.rse.2013.12.008，PDF版本可从马里兰大学获取。 或访问马里兰大学VIIRS主动火点专题网页：http://viirsfire.geog.umd.edu/
