VISSR/SMS-1 Infrared Imagery on 70mm Film V001 (VISSRSMS1IMIR) at GES DISC

VISSRSMS1IMIR is the Visible Infrared Spin-Scan Radiometer (VISSR) Infrared Imagery on 70mm Film data product from the first Synchronous Meteorological Satellite (SMS-1). This set of IR imagery (10.5 to 12.5 micrometer) was originally produced on commercial image-generation equipment from digital tapes and was made available on 70-mm film, from which they were later scanned to digital TIFF image files. Each TIFF scan contains 2 or 3 pictures, and there are several hundred scans from an original 70 mm film roll which are combined into a ZIP file. Each picture contains a title on the top boundary and a 33-level gray scale on the right boundary that represents brightness temperatures. It may have a combination of the following options: 1) contrast enhancement, 2) image sectorization, and 3) 1/16-size imagery. The maximum effective size covers 500 sq km, represented by 4000 by 3904 pixels. Each element has a maximum resolution of 3.7 km. The title contains the satellite identification, picture number, picture type, coordinate numbers of the top left pixel relative to the visible sensor, start time of sectorized image, and pixel scaling and sector size identification.

The SMS-1 satellite was initially parked over the equator at longitude 45W on June 7, 1974 viewing the hemisphere below the satellite to support the GARP Atlantic Tropical Experiment (GATE). It was moved to its operational position at 75W on Nov 15, 1974 where it remained until GOES-1 was launched, after which SMS-1 was moved to 105W and placed in stand-by-mode as a backup to GOES-1 or SMS-2. The VISSR experiment was operated by the NOAA National Environmental Satellite Data and Information Service (NESDIS), as well as scientists from NASA Goddard Space Flight Center.

This product was previously available from the NSSDC with the identifier ESAD-00068 (old ID 74-033A-01C).

VISSRSMS1IMIR是首颗同步气象卫星SMS-1（Synchronous Meteorological Satellite 1）搭载的可见光红外自旋扫描辐射计（Visible Infrared Spin-Scan Radiometer，VISSR）红外影像70毫米胶片数据产品。该数据集的红外影像波段范围为10.5至12.5微米，最初由数字磁带通过商用图像生成设备制作，以70毫米胶片形式发布，后续经扫描转换为数字TIFF（Tagged Image File Format）图像文件。每份TIFF扫描件包含2或3幅图像，原始70毫米胶片卷对应的数百份扫描件被打包为ZIP压缩文件。每幅图像的顶部边界带有标题，右侧边界带有代表亮温的33级灰度标尺。该类影像可包含以下一项或多项处理选项：1）对比度增强；2）图像分扇区处理；3）1/16分辨率缩略影像。其最大有效覆盖范围为500平方千米，对应4000×3904像素，单个像素的最高分辨率为3.7千米。图像标题包含卫星标识、图像编号、图像类型、相对于可见光传感器的左上角像素坐标、分扇区影像的起始时间，以及像素缩放与扇区尺寸标识。

SMS-1卫星于1974年6月7日被部署于西经45度的赤道上空，对卫星下方半球进行观测，以支持GARP大西洋热带实验（Global Atmospheric Research Program Atlantic Tropical Experiment，GATE）。1974年11月15日，该卫星被转移至任务指定位置西经75度，并在此运行至GOES-1发射升空，此后SMS-1被转移至西经105度，切换至待机模式，作为GOES-1或SMS-2的备份卫星。VISSR实验由美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration，NOAA）国家环境卫星数据和信息服务局（National Environmental Satellite Data and Information Service，NESDIS）以及美国国家航空航天局戈达德太空飞行中心的科研团队共同运营。

该数据集此前可通过美国国家空间科学数据中心（National Space Science Data Center，NSSDC）获取，其原标识符为ESAD-00068（旧标识符为74-033A-01C）。