VIIRS/JPSS1 Day/Night Band 6 Min L1B Swath 750m NRT

The VIIRS/JPSS1 Day/Night Band 6-Min L1B Swath 750m Near Real Time (NRT) product, short-name VJ102DNB_NRT is one of the VIIRS Level 1 and Level 2 swath products that are generated from the processing of 6 minutes of VIIRS data acquired during the Joint Polar Satellite System - 1 (JPSS1) satellite overpass. The Day/Night band (DNB) is a panchromatic channel covering the wavelengths from 500 nm to 900 nm, and sensitive to visible and near-infrared from daylight down to the low-level radiation observed at night.

The VIIRS DNB is much improved from previous products due in large part to its complicated continuous on-board calibration. In addition, new-moon Earth observations are used to estimate and remove stray light. These corrections are a first of its kind to provide on-orbit radiometric calibration. The corrections made to the DNB data are provided by the NASA VIIRS Characterization Support Team and are likely to continue to evolve given this new methodology.

The spatial resolution of the instrument at viewing nadir is approximately 750 m for the DNB and the Moderate-resolution Bands and and 375m for the Imagery bands. The DNB is aggregated to maintain nearly constant horizontal spatial resolution across the swath.

As the DNB is sensitive to nighttime radiation over the full lunar cycle, the incoming solar and lunar radiation must be properly modeled to calculate the reflectance. However, the DNB is sensitive to more sources of radiation than just the sun and moon.

VIIRS/JPSS1 白昼/黑夜波段 6分钟 L1B 波段 750米近实时（NRT）产品，简称 VJ102DNB_NRT，是源自于联合极地卫星系统-1（JPSS1）卫星过境期间获取的 VIIRS 数据处理后的 VIIRS 第1级和第2级波段产品之一。白昼/黑夜波段（DNB）是一个涵盖波长从500纳米至900纳米的全色通道，对白天的可见光和近红外光直至夜间观测到的低层辐射均具有敏感性。

VIIRS DNB 相较于先前产品有了显著提升，这主要归功于其复杂的连续机载校准。此外，利用新月地球观测数据来估算并移除杂散光。这些校正为在轨辐射校准提供了先例。对 DNB 数据进行的校正由 NASA VIIRS 特征支持团队提供，并可能随着这种新方法的实施而持续演进。

该仪器在观测天顶时的空间分辨率约为 750 米（对于 DNB 和中分辨率波段），以及 375 米（对于影像波段）。DNB 被汇总以保持整个波段的近恒定水平空间分辨率。

由于 DNB 对整个月球的夜间辐射敏感，因此必须对入射的太阳和月球辐射进行适当的建模，以计算反射率。然而，DNB 对辐射的敏感性远不止太阳和月球。