These data sets have a spatial resolution between 10–80 m and are collected on a weekly to monthly basis. They are the most commonly used category of imagery data. For several decades the Landsat series of satellites have provided the majority of medium.
Geoscience Australia started acquiring ETM+ data from the Landsat 7 satellite in July 1999. The Geoscience Australia archive is the largest repository of Landsat 7 images covering Australia.
A fault with the Landsat 7 Scan Line Corrector (SLC) occurred on 31 May 2003 resulting in small gaps in the processed products.