VIIRS/JPSS2 Day/Night Band 6-Min L1B Swath 750m NRT

The Near Real Time (NRT) VIIRS Level 1 and Level 2 swath (VJ202DNB_NRT) product is single NASA VIIRS panchromatic Day-Night band (DNB) calibrated radiance product. The DNB is one of the M-bands with an at-nadir spatial resolution of 750 meters (across the entire scan). The panchromatic DNB's spectral wavelength ranges from 0.5 µm to 0.9 µm. It facilitates measuring night lights, reflected solar/lunar lights with a large dynamic range between a low of a quarter moon illumination to the brightest daylight. The DNB attempts to maintain a nearly constant 750-m resolution over the entire 3060 km orbital swath by resorting to an on-board aggregation method, which also renders the calibration of the DNB a challenge. Stray-light and other sources of noise (lunar illuminance, twilight, clouds, noisy scan-edges, etc.) affect the DNB quality, and warrant correction.

For more information download VIIRS Level 1 Product User's Guide at:
https://ladsweb.modaps.eosdis.nasa.gov/archive/Document%20Archive/Scien…

近实时（NRT）VIIRS Level 1 和 Level 2 波段（VJ202DNB_NRT）产品为单一的美国宇航局VIIRS多光谱日夜波段（DNB）校准辐射产品。日夜波段（DNB）是M波段之一，其视场中心的空间分辨率为750米（覆盖整个扫描范围）。该波段的多光谱DNB的光谱波长范围为0.5微米至0.9微米。它有助于测量夜光、反射的太阳光/月光明，且在从四分之一月光的最低亮度到最亮的白昼之间具有广泛的动态范围。DNB通过在3060公里轨道带内采用机载聚合方法，力求在整个波段内保持近乎恒定的750米分辨率，但这同时也使得DNB的校准成为一项挑战。杂散光和其他噪声源（如月照明、黎明、云层、扫描边缘噪声等）会影响DNB的质量，并需要进行校正。有关更多信息，请下载VIIRS Level 1产品用户指南：https://ladsweb.modaps.eosdis.nasa.gov/archive/Document%20Archive/Scien…