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

The VNP14IMG_NRT is a Near Real Time (NRT) S-NPP/VIIRS 375 m active fire detection data product (Schroeder 2014). The product is built on the EOS/MODIS fire product heritage [Kaufman et al., 1998; Giglio et al., 2003], using a multi-spectral contextual algorithm to identify sub-pixel fire activity and other thermal anomalies in the Level 1 (swath) input data. 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 the Land, Atmosphere Near real-time Capability for EOS (LANCE). The data are formatted as HDF4 files. Complementary ASCII files containing the short list of fire pixels detected are also available through LANCE 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/

VNP14IMG_NRT 是一款近实时（Near Real Time，NRT）S-NPP/VIIRS 375米分辨率火点主动探测数据产品（Schroeder等，2014）。该产品承袭了EOS（Earth Observing System，地球观测系统）/MODIS（Moderate Resolution Imaging Spectroradiometer，中分辨率成像光谱仪）火点产品的技术体系，采用多光谱上下文算法，从一级（条带）输入数据中识别亚像元火点活动与其他热异常信号。该算法依托全部5个375米分辨率VIIRS（Visible Infrared Imaging Radiometer Suite，可见光红外成像辐射仪套件）波段完成火点探测，并对图像中的陆地、水体与云像元进行区分。额外配置的750米波段可补充VIIRS多光谱数据集。上述波段将作为基准型火点主动探测产品的输入数据源，该产品可实现与EOS/MODIS 1千米火点与热异常产品的数据连续性。

VIIRS 375米火点探测数据属于基于科学数据记录（Science Data Record，SDR）一级条带格式的二级数据产品。目前该近实时产品可通过NASA的EOS陆地大气近实时能力服务（Land, Atmosphere Near real-time Capability for EOS, LANCE）获取。数据格式为HDF4文件。LANCE处理系统还可同步提供包含检测到的火点像素简表的补充ASCII文件。

如需获取更多详细信息，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

以及：
Schroeder, W., Oliva, P., Giglio, L. 与 Csiszar, I. A. (2014). 《新型VIIRS 375米火点主动探测数据产品：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 可从马里兰大学获取该文献PDF版本

或：
访问马里兰大学VIIRS火点研究网页：http://viirsfire.geog.umd.edu/