S-NPP CrIS IMG_COL: Array indices for collocated VIIRS observations V2 (SNDRSNCrISL1BIMGC) at GES DISC

The Cross-track Infrared Sounder (CrIS) Level 1B Normal Spectral Resolution (NSR) data files contain radiance measurements along with ancillary spacecraft, instrument, and geolocation data of the CrIS instrument on the Suomi National Polar-orbiting Partnership Project (SNPP). In December 2014, the CrIS instrument on the SNPP satellite doubled the spectral resolution of shortwave infrared data being transmitted to the ground. In November 2015, additional points were included at the ends of the longwave and shortwave interferograms to improve the quality of the calibration. Prior to November 2, 2015 the data are only available in Normal Spectral Resolution, after November 2, 2015 at 16:06 UTC, the data are available in both NSR and Full Spectral Resolution (FSR).

The NSR files have 1,317 channels: 163 shortwave channels from 3.9 to 4.7 microns (2555 to 2150 cm-1), 437 midwave channels from 5.7 to 8.05 microns (1752.5 to 1242.5 cm-1), and 717 longwave channels from 9.1 to 15.41 microns (1096.25 to 648.75 cm-1). Each CrIS field-of-regard (FOR) contains 9 field-of-views (FOVs) arranged in a 3X3 array. The Level 1B files contain 30 FORs in the cross track direction and 45 in the along track direction. Data products are constructed on six minute boundaries.

The Visible Infrared Imaging Radiometer Suite (VIIRS) has 22 imaging and radiometric bands covering wavelengths from 0.41 to 12.5 microns. It provides the sensor data records for clouds, sea surface temperature, ocean color, and others. This IMG_COL product contains the colocation indices of the VIIRS pixels within each CrIS footprint.

苏omi国家极地轨道合作项目（SNPP）上的交叉轨迹红外探测器（CrIS）一级B类正常光谱分辨率（NSR）数据文件包含了辐射度测量值，以及CrIS仪器在SNPP卫星上的辅助航天器、仪器和地理定位数据。2014年12月，SNPP卫星上的CrIS仪器将传输到地面的短波红外数据的光谱分辨率提高了一倍。2015年11月，为了提升校准质量，在长波和短波干涉图的末端增加了额外的测量点。2015年11月2日之前的数据仅以正常光谱分辨率提供，而自2015年11月2日16:06 UTC起，数据以NSR和完整光谱分辨率（FSR）两种形式提供。NSR文件包含1,317个通道：163个短波通道，波长范围为3.9至4.7微米（2555至2150厘米^-1），437个中波通道，波长范围为5.7至8.05微米（1752.5至1242.5厘米^-1），以及717个长波通道，波长范围为9.1至15.41微米（1096.25至648.75厘米^-1）。每个CrIS视场（FOR）包含9个视场（FOV），以3x3阵列排列。一级B类文件在横切方向上包含30个FOR，在沿切方向上包含45个FOR。数据产品以六分钟为边界构建。可见光红外成像辐射计套装（VIIRS）拥有22个成像和辐射度测量波段，覆盖波长从0.41至12.5微米。它提供了云、海表面温度、海洋颜色等传感器的数据记录。本IMG_COL产品包含了VIIRS像素在每个CrIS足迹内的共定位指数。