I created a DEM in ArcMap (10.3) using Topo to Raster. Then, when I tried to create a hillshade using spatial analyst, result look like the picture below. Any idea on what causing the contour-like artifact? The profile graph on the left represents the values of the hillshade along the black line, while the graph on the right represents the DEM values at the same location.
The isoline paper maps are usually the cheapest and quite often the only available sources of information on the spatial pattern of terrain altitude, rain intensity, snow depth and many other phenomenon. Unfortunately “…interpolating digitized contours to a regular grid can result in the creation of severe artefacts in this resulting surface. Curiously enough, the more care that is taken to digitize a contour line with many sampled points, the greater the problem. ...commercial GIS may include procedures for interpolating from contours.“ Burrough, P.A., McDonnell R.A. Principles of Geographical Information Systems. Oxford University Press, 1998. ISBN 0-19-823365-5 (Pbk), p. 128
We are lucky to have advanced topo to raster tool, but as one can see even it does not eliminate artefacts completely