GIS4301_Lecture_09 - GIS4301C GIS for Environmental Studies...

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Unformatted text preview: GIS4301C GIS for Environmental Studies Spring 2010 Michael J. Gilbrook, GISP, AICP Frank Salmon, GISP Lecture 09 Overview of 3D Analysis Spring 2010 Lecture #09 Slide Number 2 GIS & Dimensionality 2D (or Planimetric) Geographic surfaces seen in two-dimensions (x,y), in plan view, as from above. 2.5D Terrain expressed in three dimensions (x,y,z), but surface features (e.g., forests, buildings) still represented as 2D draped onto the 3D terrain surface. 3D Terrain and surface features (e.g., buildings) expressed in three dimensions to give realistic appearance. Spring 2010 Lecture #09 Slide Number 3 3D Data Raster (Grid) vs. TIN Raster (Grid) Triangular Irregular Network (TIN) Spring 2010 Lecture #09 Slide Number 4 Components of a TIN Nodes The vertices of the facets which make up the tin surface Edges The lines connecting vertices Triangles Each individual surface facet is a triangle. The entire surface consists...
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GIS4301_Lecture_09 - GIS4301C GIS for Environmental Studies...

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