#GIS Raster Analysis. Terrain Analysis.#Remote_Sensing #Geography #Cartography

Assessment

Raster Analysis
and
Terrain Analysis.

Digital Elevation Models
Terrain Analysis
Slope and Aspect

Used for: hydrology, conservation, site planning, other infrastructure development.

Watershed boundaries, flowpaths and direction, erosion modeling, and viewshed determination all use slope and/or aspect data as input.

Slope is defined as the change is elevation (a rise) with a change in horizontal position (a run).

Slope is often reported in degrees (0° is flat, 90° is vertical)
.
Aspect

The orientation (in compass angles) of a slope

Calculation:

Aspect = tan-1[ -(ΔZ/Δy)/(ΔZ/Δx)]

As with slope, estimated aspect varies with the methods used to determine ΔZ/Δx and ΔZ/Δy

Aspect calculations also use the four nearest cell or the 3rd-order finite difference methods.

#Geography
#Cartography
#GIS
#Remote_Sensing
#Geographer
#Cartographer
#Globe
#Earth
#Map
#Decision Making

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