This series of graphics shows the difference in TIN accuracy affected by additional points and supplemental contours.  Points were added between contours in areas where interpolation errors occurred; flat triangles are the result of the three nodes of a triangle being sampled from the same contour and thus having the same elevation.  This most likely occurs along ridge lines and valley bottoms where contours are tightly curved and/or spaced far apart such as along a gently ascending ridge line.
 

no.added.points	added.points
no.added.points	added.points

Enlarged view of a TIN triangles overlaid with hill shaded DEM and TIN with hypsographic shading.

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created by jeff 9/1/00