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3-D drape
The method of superimposing thematic layers such as vegetation and roads on 3-D perspective views.
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Aspect
The directional measure of slope.
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Base contour
The contour from which contouring starts.
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Breaklines
Line features that represent changes of the land surface such as streams, shorelines, ridges, and roads.
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Contour interval
The vertical distance between contour lines.
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Contour lines
Lines connecting points of equal elevation.
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Delaunay triangulation
An algorithm for connecting points to form triangles such that all points are connected to their nearest neighbors and triangles are as compact as possible.
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Hill shading
A graphic method that simulates how the land surface looks with the interaction between sunlight and landform features. The method is also known as shaded relief.
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Hypsometric tinting
A mapping method that applies color symbols to different elevation zones. The method is also known as layer tinting.
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Maximun z-tolerance
A TIN construction algorithm, which ensures that, for each elevation point selected, the difference between the original elevation and the estimated elevation from the TIN is within the specified tolerance.
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Perspective view
A graphic method that produces 3-D views of the land surfaces.
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Slope
The rate of change of elevation at a surface location, measured as an angle in degrees or as a percentage.
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Vertical profile
A chart showing changes in elevation along a line such as a hiking trail, a road, or a stream.
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Viewing angle
A parameter for creating a perspective view, measured by the angle from the horizon to the altitude of the observer.
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Viewing azimuth
A parameter for creating a perspective view, measured by the direction from the observer to the surface.
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Viewing distance
A parameter for creating a perspective view, measured by the distance between the viewer and the surface.
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VIP
An elevation point selection algorithm, which evaluates the importance of an elevation point by measuring how well its value can be estimated from the neighboring point values.
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z-scale
The ratio between the vertical scale and the horizontal scale in a perspective view. Also called the vertical exaggeration factor.
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