VIIRS/JPSS1 Moderate-Resolution Dual Gain Bands Calibrated Radiance 6-Min L1B Swath 750m -NRT

The Level-1 and Level-2 swath products are generated from the processing of 6 minutes of VIIRS data acquired during the JPSS1 satellite overpass. The VIIRS sensor has 5 high-resolution imagery channels (I-bands) that have 32 detectors (32 rows of pixels per scan), with twice the resolution of the M-bands and the DNB, that span the wavelengths from 0.640 µm to 11.45 µm. There are also 7 dual-gain VIIRS bands. The dual gain moderate resolution bands (M1 to M5, M7 and M13) have 6304 samples and the other moderate resolution bands have 3200.

The Near Real Time (NRT) VIIRS/JPSS1 Moderate-Resolution Dual Gain Bands Calibrated Radiance 6-Min L1B Swath 750m product (VJ102GDC_NRT) contains unaggregated, calibrated TOA radiances for those VIIRS sub-pixel samples that are aggregated along-scan during post-calibration ground processing. In other words, this file contains the calibrated M1 – M5, M7 and M13 dual gain band data from the nadir and near-nadir zones that would otherwise be discarded following post-calibration aggregation/Earth View Radiometric Calibration Unit.

For additional information, see the Operational Algorithm Description (OAD) Document for the L1B product at http://npp.gsfc.nasa.gov/sciencedocs/2015-08/474-00090_OAD-VIIRS-CAL-GE…. The document describes how VIIRS operates in space and provides the equations implemented by the L1B software to generate the MODIS Level-1 intermediate products. It is a summary document that presents the formulae and error budges used to transform VIIRS digital counts to radiance and reflectance.

Level-1 及 Level-2 的扫描产品是通过处理JPSS1卫星过境期间采集的6分钟VIIRS数据进行生成。VIIRS传感器具备5个高分辨率成像通道（I波段），每个通道拥有32个探测器（每扫描行包含32个像素），其分辨率是M波段和DNB的两倍，波长范围从0.640微米至11.45微米。此外，还包含7个双增益的VIIRS波段。双增益中分辨率波段（M1至M5，M7及M13）包含6304个样本，而其他中分辨率波段则包含3200个样本。

近实时（NRT）VIIRS/JPSS1中分辨率双增益波段校准辐射6分钟L1B扫描750米产品（VJ102GDC_NRT）包含了在地面后校准过程中沿扫描线聚合的VIIRS亚像素样本的非聚合、校准后的TOA辐射值。换句话说，该文件包含了来自视场中心和近视场中心的M1 – M5，M7和M13双增益波段数据，这些数据在地面后校准聚合/地球观测辐射校准单元处理中本应被舍弃。

如需更多信息，请参阅L1B产品操作算法描述（OAD）文档，文档位于http://npp.gsfc.nasa.gov/sciencedocs/2015-08/474-00090_OAD-VIIRS-CAL-GE…。该文档描述了VIIRS在空间中的运行机制，并提供了L1B软件实现MODIS Level-1中间产品的方程式。这是一份总结性文档，展示了将VIIRS数字计数转换为辐射和反射率的公式及误差预算。