El-Reay et al (1999) investigated the coastal erosion from the pictures taken by the Landsat 5 TM and spot at Terkos Lake, Turkey and considered the information from Thai Meteorological Department and Oceanography during a long period of time. They also analyzed sets of pictures by putting them on the same area during the different times. It showed a very clear picture about changes of the coast caused by an rosion. The way pictures were put together on the same area, the researchers needs to define a specific coordinate system and analyze the correlation about the results to other information as well. Moreover, storms are the main factor causing changes to the coasts.