SAFARI 2000 MODIS MOD04_L2 Aerosol Data, GRANT Format, for Southern Africa

The subset of the MODIS MOD04_L2 aerosol product provided in this data set represents the swaths that coincide with known times of the South African Weather Bureau/Service (SAWS) Aerocommanders JRA and JRB research aircraft missions to support aerosol research and validation activities for the SAFARI 2000 region. The MODIS aerosol product monitors the ambient aerosol optical thickness over the oceans globally and over a portion of the continents. Further, the aerosol size distribution is derived over the oceans, and the aerosol type is derived over the continents. Daily Level 2 data are produced at the spatial resolution of a 10 x 10 1 km (at nadir) pixel array. The daily data files cover the period August 21, 2000, through September 26, 2000. For some data collection dates, there are two or more data files.The MOD04_L2 swath data files included in this data set are from the GSFC DAAC (V4.1.0, Collection 004). The MODIS Level 2 data files were converted from Hierarchical Data Format (HDF) to granule tables (GRANT) format. The GRANT format provides the extracted Scientific Data Set (SDS) in ASCII table form where each pixel (x,y) is represented as a row of data with georeferencing information and each SDS is provided as a separate column in the table. The ASCII tables are in comma-delimited format.

本数据集提供的MODIS MOD04_L2 气溶胶产品子集，代表与南非气象局/服务机构（SAWS）气溶胶指挥官JRA和JRB研究飞机任务已知时间相吻合的条带，旨在支持SAFARI 2000区域的气溶胶研究及验证活动。MODIS气溶胶产品全球范围内监测海洋以及部分大陆上的环境气溶胶光学厚度。此外，海洋上的气溶胶尺寸分布及大陆上的气溶胶类型均得以推导。每日二级数据以10 x 10 1 km（正下方像素阵列）的空间分辨率生成。每日数据文件涵盖2000年8月21日至2000年9月26日期间的数据。对于某些数据收集日期，存在两个或更多数据文件。本数据集中包含的MOD04_L2 条带数据文件来自GSFC DAAC（V4.1.0，收集号004）。MODIS二级数据文件已从层次数据格式（HDF）转换为颗粒表（GRANT）格式。GRANT格式提供了以ASCII表格形式提取的科学数据集（SDS），其中每个像素（x,y）由一行数据表示，包含地理参照信息，每个SDS作为表格中的单独列提供。ASCII表格采用逗号分隔格式。