Key Terms

z-value

vertical datum

topographic map

DRG

GeoTIFF

collar

contour line

contour interval

US Topo

DTM

two-and-a-half-dimensional (2.5D) model

three-dimensional (3D) model

TIN

DEM

NED

viewshed

slope

slope aspect

SRTM

LIDAR

LAS

pseudo-3D

perspective view

hillshade

Sun altitude

Sun azimuth

draping

base heights

vertical exaggeration

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