3D and Surface/Terrain Analysis. Prepared by:. George McLeod. With support from:. NSF DUE-0903270. in partnership with:. Geospatial Technician Education Through Virginia’s Community Colleges (GTEVCC). . D. Digital Terrain Models.
With support from:
in partnership with:
Geospatial Technician Education Through Virginia’s Community Colleges (GTEVCC)
DDigital Terrain Models
The function defined on each square can also be a bilinear function interpolating all four elevation points corresponding to the vertices of the square
Contours are usually available as sequences of points
A line interpolating points of a contour can be obtained in different ways
Examples: polygonal chains, or lines described by higher order equations
They are easily drawn on paper
They are very intuitive for humans
They are not good for complex
automated terrain analysis
Image Source: Chrisman, Nicholas.(2002). 2nd Ed. Exploring Geographic Information Systems. p 198. fig. 8-14.
Setting a hypothetical light source and calculating the illumination values for each
cell in relation to neighboring cells. It can greatly enhance the visualization of a
surface for analysis or graphical display.
Azimuth 315°, altitude 45°
hillshaded DEM as background
3D landscape model impact on natural beauty
3D height data changing water levels-danger areas