Digitized Ozone Data

Description

This data collection contains data produced from microdensitometer scans of the film frames in collection SPIO-00203 (Ozone Photographs). Each record contains one scan line. A file mark is placed at the end of each complete frame scan. Four file marks indicate the end of recording on a tape. The identification label at the beginning of each record gives the magnetic tape number and file number, data of tape recording, ID of film frame, frame number, number of steps per scan line, number of scan lines, aperture size in micrometers, and speed of scan. Included in the record are the X and Y coordinates, the distance between density readings, and the density (or transmission) value. Details of the scan technique, the calibration procedure, and conversion to ozone data are contained in the document distributed with the data. Also see Applied Optics, v. 16, no. 4, pp. 983-992, April 1977. For more information on this data set, contact Dr. Donald Packer, 1623 Fran Hammond Parkway, Alexandria, VA 22302.