With reference to the Digital Elevation Model DEM technology consider the following statements ...........

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With reference to the Digital Elevation Model (DEM) technology, consider the following statements.

1.DEM is a 2D representation of a terrain's surface created from a terrain's elevation data.

2.Owing to technological constraints, it is not possible to prepare DEM by remote sensing; map- makers often use LIDAR and survey data instead.

3.The government has decided to use DEM technology in the National Missions for Clean Ganga.

Select the correct answer using the codes below.

1 and 3 only

2 and 3 only

3 only

1 only

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Explanation:

Statement 3: National Mission for Clean Ganga has brought on board Survey of India to facilitate the Ganga rejuvenation task by using Geographic Information System (GIS) technology. Through the project, NMCG aims to strengthen planning and implementation at national/state/local levels. Statement 1 and 2: The project includes use of Digital Elevation Model (DEM) technology which ensures accurate data collection, an important aspect for river basin management planning. DEM technology enables identification of entire topography of an area making it easy for policy makers to analyse the available data thereby supporting the decision-making process. Critical hotspots are also easily identified through this technology.
Statement 2: A DEM is a 3D CG representation of a terrain's surface – commonly of a planet (e.g. Earth), moon, or asteroid – created from a terrain's elevation data.
Mappers may prepare digital elevation models in a number of ways, but they frequently use remote sensing rather than direct survey data.
Methods for obtaining elevation data used to create DEMs are: unmanned aerial vehicle
Lidar
Stereo photogrammetry from aerial surveys Topographic maps etc.

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