3D Analyst
description
Transcript of 3D Analyst
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3D Analyst
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Components• ArcScene
– Is where 3D Analyst is located– Visualization and Some Analysis
• ArcGlobe– Like Google Earth – google’s is better
• ArcMap - does NOT display 3D!• ArcCatalog – can preview in 3D
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3D Data• Has a Z value• Elevation is most common Z value• But can also represent
– Pollution levels– Noise levels– Precipitation …. Etc.
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Kinds of 3D data structures• DEM raster
• TIN (Triangulated Irregular Network)
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TIN• Every 3
points of Z are connected to make a Triangle w/ Area, Slope, and Aspect.
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3D view• Open ArcScene• Load DEM or TIN• Raster will be flat!• Set base height• Set vertical exaggeration • Illumination of DEM
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Navigation tools different• General nav tool• Zoom tool Fly tool• Guess what?• Expand field of view• Narrow Field of View
Done while we go through these
demos
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Vertical Exaggeration• Why?
– used to emphasize small changes– bring z-units into proportion with x,y
units• It is a only visual effect that does
NOT affect analysis
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Illumination • Every Scene has a light source – the sun• Thus different parts of the scene are
illuminated differently• The sun’s position is described by…
– The sun’s azimuth is measured from 0 (north) to 360 (north) ccw. (315 (NW) is default)
– The sun’s altitude (0-90) is its height above the horizion.
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Layer Properties• Base Heights
– establishes the elevations of surface locations and features.
• Extrusions – tells 3D Analyst how high a feature rises
above the ground or extends below it.
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Base Heights• Elevation values that are used to display
a layer in 3D. • These values can come from various
places.– layer:
• the node elevations in a TIN, • the cell values in a raster, • the z-values in a 3D feature layer, •or the elevation attribute values for a 2D feature
layer.
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Rendering• In layer’s properties• Scene Layer properties
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Extrusions• three-dimensional extension of
features. – An extruded point a line;– an extruded line a wall; – an extruded polygon a chunk.
• There are many methods used to do this
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Surface Calculations• Slope• Aspect• Hillshade• Contours• (Reclassification) • Pretty much the same as ArcGIS
but tools in 3D Analyst Tools
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Adding 2D data• Turning on in TOC does not do
much – maybe can’t even see it!• Have to set the layer’s elevations
– Layer properties/Base Heights from DEM
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