DEM. Slope. Aspect. View-shed. Raster Calculator. #GIS #Remote_Sensing #Geography #Cartography

Assessment

DEM. Slope. Aspect. View-shed. Raster Calculator. #GIS #Remote_Sensing #Geography #Cartography.
A digital elevation model (DEM) is a 3D computer graphics representation of elevation data to represent terrain, commonly of a planet (e.g. Earth), moon, or asteroid.
A "global DEM" refers to a discrete global grid.
A slope is the rise or fall of the land surface. It is important for the farmer or irrigator to identify the slopes on the land.
A slope is easy to recognize in a hilly area.
Horizontal: 0 - 0.2
Steep: more than 2.5
Flat: 0.5 - 1.
Elevation and slope are the two elements that determine how landforms physically appear and connect.
Elevation
The ‘contour interval’ – the elevation between contours – is the vertical distance between adjacent contour lines. On 1:25,000 maps usually used by bushwalkers, contours are either 10 or 20 m apart.

Aspect is the compass direction that a slope faces (it is also known as exposure).
The term aspect can also be used to describe the shape or alignment of a coastline.
Here, the aspect is the direction which the coastline is facing towards the sea.

#Geographer
#Cartographer
#Globe
#Earth
#Map
#Decision Making

Vineesh V,
Assistant Professor Geography,
Directorate of Collegiate Education,
Government of Kerala, India