MODIS/Terra Raw Radiances in Counts 5-Min L1A Swath - NRT

This is MODIS Level-1A Near Real Time (NRT) product containing reformatted and packaged raw instrument data. MODIS instrument data, in packetized form, is reversibly transformed to a computer data structure, along with formatted engineering and spacecraft ancillary data. The Level-1A data is separated into granules for passage to the geolocation and calibration processes. Quality indicators are added to the data to indicate missing pixels and instrument modes. This product contains MODIS digitized raw detector counts data for all 36 MODIS spectral bands, at 250 m, 500 m, or 1 km spatial resolutions including all time tags, all detector views (Earth, solar diffuser, Spectro-Radiometeric Calibration Assembly (SRCA), black body, and space view), and all engineering and ancillary data. Quality indicators are added to to the data to indicate missing or bad pixels and instrument modes. Only bands 20 to 36 are used to collect measurements in night mode, while all bands are used in day mode. Visible, SWIR, and NIR measurements are made during daytime only, while radiances for TIR are measured during both day and night portions of the orbit.

本数据集为MODIS（中分辨率成像光谱仪）Level-1A实时近实时（NRT）产品，包含重新格式化和打包的原始仪器数据。MODIS仪器数据以分组的形态，经过可逆转换成为计算机数据结构，并附有格式化的工程和航天辅助数据。Level-1A数据被分割成数据块，以便进行地理定位和校准处理。数据中加入了质量指示符，用以标识缺失的像素和仪器模式。该产品包含MODIS数字化原始检测器计数数据，涉及所有36个MODIS光谱波段，空间分辨率为250米、500米或1公里，包括所有时间标签、所有检测器视角（地球、太阳漫射器、光谱辐射计校准组件（SRCA）、黑体和太空视角），以及所有工程和辅助数据。数据中亦加入了质量指示符，以标示缺失或损坏的像素以及仪器模式。仅在夜间模式中，仅使用波段20至36进行测量，而在日间模式中则使用所有波段。可见光、短波红外和近红外测量仅在白天进行，而热红外辐射的亮度测量则在进行轨道的白天和夜间两部分均进行。