When this is the case the interface often has the option of providing simplified graphical overlays to highlight man-made features since these are not necessarily obvious from a photographic aerial view. Very often such virtual globes aim to provide as true a representation of the world as is possible with worldwide coverage up to a very detailed level. Those wishing to portray a visually accurate representation of the Earth often use satellite image servers and are capable not only of rotation but also zooming and sometimes horizon tilting. Virtual globes may be used for study or navigation (by connecting to a GPS device) and their design varies considerably according to their purpose. 1.2 Technical info, data, and image sources.
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