Geoscience Reference
In-Depth Information
Fig. 1.1
Points
,
lines
,
polygons
represented by both the vector (
left
) and raster (
right
) data models
World Wars. Aerial photography has been widely used thereafter for environmental
resource management and cartography.
The first step to acquire space borne remotely sensed data was taken by the
United States National Aeronautics and Space Administration (NASA) on the 23rd
of July 1972 with the successful launch of the Earth Resources Technology Satel-
lite (ERTS), later renamed Landsat 1. The Landsat program was continued and the
technology improved as new sensors were launched. This has led to one of the
largest and most comprehensive archives of remotely sensed imagery of the Earth,
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