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Problem: Surface protrudes through draped polygons in ArcScene

Description

A draped polygon is interrupted by surface features.

Cause

Polygons are a string of X,Y, and sometimes Z coordinates that define the boundary of an area. No coordinates are stored for the internal area of the polygon. ArcScene uses the vertices of the polygon boundary to define its height in the scene. However no interpolation is done on the internal area of the polygon. If the surface has a spire or other feature higher than the height of the polygon's edge, the surface protrudes through the polygon.

Solution or Workaround

Convert the polygons to rasters. Rasters draped over a surface are interpolated at the center of each cell; therefore, the entire area of the raster is interpolated.

  • For ArcGIS versions 8.3 and earlier, use the Features to Raster tool found under Spatial Analyst > Convert.
  • For ArcGIS versions 9.0 and later, use the Feature to Raster tool found in ArcToolbox > Conversion > To Raster.