It can also capture a series of images over time to trace changes on a particular piece of the earth, as for example in studying the erosion of land along a coastline. But a resource satellite has a severe weakness: Limited resolution means that it is impossible to see every detail.
它還可以做「長期抗戰」：把同一個地區的影像累積起來，追蹤不同時期的改變，見證「滄海桑田」的故事。不過它的缺點是受解像力的限制，對地面的觀察仍無法做到一覽無遺的地步。