VIIRS/JPSS2 Imagery Resolution 6-Min L1B Swath SDR 375m NRT

The VIIRS/JPSS2 Imagery Resolution 6-Min L1B Swath 375m Near Real Time (NRT), short-name VJ202IMG_NRT is platform-derived NASA VIIRS L1B calibrated radiances product that comprises five image-resolution or I-bands, which have a 375-meter resolution at nadir. These I-bands comprise three reflective solar bands (RSB) and two thermal emissive bands (TEB). Each of the I-bands has 32 detectors in the along-track direction with 32 rows of pixels per scan that offer a resolution that is twice finer than that of the moderate (M) and Day-Night bands (DNB). Ranging in wavelengths from 0.6 µm to 12.4 µm, the I-bands are sensitive to visible/reflective, near-, shortwave-, mediumwave-, and longwave-infrared wavelengths. Derived from the NASA VIIRS L1A raw radiances, this product includes calibrated and geolocated radiance and reflectance data, quality flags, and granule- and collection-level metadata. In contrast to a MODIS L1B product, which temporally spans 5 minutes, the VIIRS L1B calibrated radiances product contains a nominal temporal duration of 6 minutes. The image dimensions of the 375-m swath product measure 6464 lines by 6400 pixels.

The J2 VIIRS radiometric calibration Level-1B reprocessing includes a few calibration updates for the reflective solar bands (RSB), but no significant changes for the day-night band (DNB) or thermal emissive bands (TEB).

VIIRS/JPSS2 成像分辨率6分钟L1B条带375米近实时（Near Real Time，NRT）产品，简称VJ202IMG_NRT，是源自美国国家航空航天局（NASA）的VIIRS L1B定标辐射数据产品，包含5个成像分辨率波段（即I波段），其星下点分辨率为375米。该类I波段涵盖3个反射太阳波段（Reflective Solar Bands，RSB）与2个热发射波段（Thermal Emissive Bands，TEB）。每个I波段沿轨方向配置32个探测器，单次扫描包含32行像素，分辨率较中等分辨率（M）波段与昼夜波段（Day-Night Band，DNB）高一倍。I波段的波长范围为0.6 µm至12.4 µm，可响应可见光/反射波段、近红外、短波红外、中波红外及长波红外波段的辐射信号。本产品基于NASA VIIRS L1A原始辐射数据生成，包含定标并经地理定位的辐射率与反射率数据、质量标记符，以及粒级与集合级元数据。相较于时间跨度为5分钟的MODIS L1B产品，VIIRS L1B定标辐射产品的标称时间分辨率为6分钟。这款375米条带产品的图像尺寸为6464行×6400像素。

J2 VIIRS辐射定标L1B再处理针对反射太阳波段（RSB）开展了若干定标更新，但未对昼夜波段（DNB）或热发射波段（TEB）进行重大调整。