The information about the objects and events that fills the space between the core of the earth and the Sun is crucial for the proper managing of the modern world. The vast majority of these data are acquired remotely by mounting sensors on spacecrafts, satellites, aircrafts, or ships. The information about the location and attributes of the objects in land, air and water collected, processed and saved digitally by these remote sensors constitutes a major part of the existing geospatial data. Geologists, environmental scientists, real estate professionals, agriculturalists and almost every person involved in business, government and physical and social sciences need remotely sensed data. The introduction of remotely sensed data by Google Earth, Google Map and Microsoft Bing has popularized the use of these remotely sensed data by the public and professionals.