3-D Perspective Visualization in TNT products V5.5

  V5.50 –– October 1996

The DEM surface is a a USGS DEM raster object. The drape object is a natural color airslide, georeferenced by control points.

The revised and updated 3-D Perspective process in TNTmips V5.5 (Display / 3-D Perspective) gives you fast, interactive control of multiple surface and drape objects for 3-D visualization. A number of surface raster objects can be selected, either laterally, in an array, to make a large-extent surface, or vertically, in a stack, to show separate, floating surfaces that have the same extent.

Surface objects provide the elevation information for one or more drape objects. (In this version, only raster objects can be used for surface and drape objects; future enhancements will allow raster, TIN or 3-D vector objects to be surface objects, and any object type to be used as drape objects.)

When you select a surface or drape object, the 3-D Perspective process opens a Perspective View Controls window so you can interactively adjust a wireframe view to get the effect you want. You can select either perspective or parallel views, and adjust the view direction, angle, and distance. Other controls let you adjust the z-scale, surface offset, and wireframe sampling value.

Hayward California NHAP CIR airphotos are draped over a USGS DEM elevation raster in perspective projection. The CIR airphotos have been mosiacked, trimmed, and enhanced with relief shading generated from the DEM before being draped in these views.