Changes for page 3.4. Datasets

Last modified by Tuan Le on 2019/05/28 10:42
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From version < 12.1 >
edited by Wai-Tim Ng
on 2018/08/21 13:16
To version < 11.2 >
edited by Wai-Tim Ng
on 2018/08/09 08:05
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11 11  [[**Copernicus**>>http://www.copernicus.eu/]] is the world's largest single earth observation programme and is directed by the European Commission in partnership with the [[European Space Agency>>http://www.esa.int/ESA]] (ESA). It aims at achieving a global, continuous, autonomous, high quality, wide range Earth observation capacity. Providing accurate, timely and easily accessible information to, among other things, improve the management of the environment, understand and mitigate the effects of climate change, and ensure civil security. Its cost during 1998 to 2020 are estimated at 6.7 billion euros with around €4.3bn spent in the period 2014 to 2020 and shared between the EU (66%) and ESA (33%) with benefits of the data to the EU economy estimated at roughly 30 billion euros through 2030. ESA as a main partner has performed much of the design and oversees and co-funds the development of [[Sentinel mission >>https://sentinel.esa.int/web/sentinel/missions]]1, 2, 3, 4, 5 and 6.
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14 14  A [[**Digital Elevation Model** >>https://en.wikipedia.org/wiki/Digital_elevation_model]](DEM) is a 3D computer graphics representation of a terrain's surface – commonly of a planet (e.g. Earth), moon, or asteroid – created from a terrain's elevation data. A DEM can be represented as a raster (a grid of squares, also known as a heightmap when representing elevation) or as a vector-based triangular irregular network (TIN). The TIN DEM dataset is also referred to as a primary (measured) DEM, whereas the Raster DEM is referred to as a secondary (computed) DEM. The DEM could be acquired through techniques such as photogrammetry, lidar, IfSAR, land surveying, etc.
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