Growth over time, comparing two data sets from the Landsat satellite series. The first data set was collected on August 7, 1972. The second data set was collected on July 31, 2000. Note: This Animation shows growth over time, comparing two datasets from the Landsat satellite series. The First dataset dated from August 7th, 1972 (Landsat 1), second data set dated from July 31st, 2000 (Landsat 7). Animator: Stuart A. Snodgrass (GST), Marte Newcombe (GST). Scientist: Darrel Williams (NASA/GSFC). Platforms/Sensors/Data Sets: Landsat-1/MSS, Landsat-7/ETM+, GTOPO30.