VIIRS/JPSS1 Atmospherically Corrected Surface Reflectance 6-Min L2 Swath IP 375m, 750m NRT

The VJ109_NRT is a Near Real Time (NRT) Visible Infrared Imager Radiometer Suite (VIIRS) 375 m, 750 m Atmospherically Corrected Surface Reflectance product. The VIIRS surface reflectance products are estimates of surface reflectance in each of the VIIRS reflective bands I1-I3, M1-M5, M7, M8, M10, and M11. The VNP09 Level-2 surface reflectance product contains approximately 6 minutes' worth of data. Surface reflectance for each moderate-resolution (750m) or imagery-resolution (375m) pixel is retrieved separately for the Level-2 products.

Surface reflectance is obtained by adjusting top-of-atmosphere reflectance to compensate for atmospheric effects. Corrections are made for the effects of molecular gases, including ozone and water vapor, and for the effects of atmospheric aerosols. The inputs to the surface reflectance algorithm include top-of-atmosphere reflectance for the VIIRS visible bands (VJ102MOD, VJ102IMG), the VIIRS cloud mask and aerosol product, aerosol optical thickness, and atmospheric data obtained from a reanalysis (surface pressure, atmospheric precipitable water, and ozone concentration).

All surface reflectance products are produced for daytime conditions only. The product is produced under all atmospheric conditions except for night and oceans. Pixels when not produced are replaced by fill values in the Level-2 and Level-2G products.

For more information read Suomi-NPP VIIRS Surface Reflectance User's Guide at https://viirsland.gsfc.nasa.gov/PDF/VIIRS_Surf_Refl_UserGuide_v2.0.pdf

or

visit VIIRS Land website at https://viirsland.gsfc.nasa.gov/index.html

VJ109_NRT为一种近实时（NRT）可见光红外成像辐射计（VIIRS）375米、750米大气校正地表反射率产品。VIIRS地表反射率产品是对VIIRS反射波段I1-I3、M1-M5、M7、M8、M10和M11中每个波段地表反射率的估计。VNP09级2地表反射率产品包含约6分钟的数据。对于中分辨率（750米）或影像分辨率（375米）的每个像素，均在级2产品中单独获取其地表反射率。地表反射率是通过调整大气顶反射率以补偿大气效应而获得的。对分子气体（包括臭氧和水蒸气）和大气气溶胶效应进行了校正。地表反射率算法的输入包括VIIRS可见波段（VJ102MOD、VJ102IMG）的大气顶反射率、VIIRS云掩膜和气溶胶产品、气溶胶光学厚度以及从再分析中获得的大气数据（地表气压、大气可降水量和臭氧浓度）。所有地表反射率产品仅适用于白天条件。产品在除夜间和海洋之外的所有大气条件下生产。未生产时的像素在级2和级2G产品中由填充值替换。欲了解更多信息，请参阅Suomi-NPP VIIRS地表反射率用户指南，链接为https://viirsland.gsfc.nasa.gov/PDF/VIIRS_Surf_Refl_UserGuide_v2.0.pdf，或访问VIIRS陆地网站，链接为https://viirsland.gsfc.nasa.gov/index.html。