The two PowerPoint documents (Composite_log_2003.ppt and Composite_lin_2003.ppt) present a one hour long dataset acquired by the D-ASIVA instrument in Colorado Springs, CO in May of 2008. The instrument was operated broadband in the 8-14 micron atmospheric window. Images were acquired every minute with each stored image comprised of 16 separate half-second images stored in a data cube 324x256x16 for a total exposure of ~8 seconds. Each half-second exposure image stored in the data cube is the sum of 16 frames acquired at 30 frames per second.
In both documents the upper left panel shows the calibrated brightness temperature image displayed in degrees Celsius below the ambient ground temperature. Only the first image of the data cube is shown. The lower left panel shows an image that is produced by replacing each pixel in the image by the standard deviation of the 16 values stored in the data cube for that pixel. The upper right image is produced by taking this standard deviation image and applying a 3x3 boxcar smoothing algorithm. The lower right image is constructed by first producing a difference image representing Image 1 + Image 3 + … + Image 15 minus Image 2 + Image 4 + … + Image 16. Each pixel in the difference image is then replaced by the standard deviation of a 3x3 box centered on that pixel. Both logarithmic (low contrast) and linear (high contrast) representations of the data are presented in the PowerPoint documents.
