Using historical Satellites for Change Detection

It is sometimes easy to forget how much information we can get from historical satellite data. One of our oldest land observation systems is the USGS/NASA Landsat series dating back to 1972. There have been many iterations of the Landsat platform, but it does maintain a high degree of backwards compatibility. You can read more about Landsat’s history at or

For the period before 1984, it is relatively difficult to access data (as can be seen from the following request for images over Denmark in the period 1972-1974, where there on earth explorer ( only are 12 images

After 1984 you can expect good global coverage. You can get a quick idea of what to expect by looking at the google Earth Engine time-laps app