3d gis so far, all data has had x, y coordinates –north-south and east-west 3d requires a z value...
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3D GIS• So far, all data has had x, y coordinates
– North-south and east-west• 3D requires a z value
– Elevation and/or depth
Mt. EverestWordpress.com
Elevation: Height of land • Typically:
– Elevation above “mean sea level”– By default, from the ellipsoid defined in the
datum• Can have a “vertical datum”
– Typically local datums
Shuttle Radar Telemetry Mission (SRTM)Jet Propulsion Labs
Bathymetry• Depth below “mean sea level”
Frank A. Palmer and Louise B.Crary, that collided and sank in Massachusetts Bay in 1902.
Crater Lake Bathymetry• From over 2000 surveys
Wikimedia.org
Three Dimensions: X, Y, Z
• Six degrees of freedom!
Wikipedia
Can also create animations• See youtube• http://
www.youtube.com/watch?v=qzkBnCBpQAM– Artificial terrain fly through (not ArcScene)
• http://www.youtube.com/watch?v=nhXaScaT87o– With music in ArcScene (you can do better)
• Note: ArcScene is not a gaming engine!
Temporal Data• Adding temporal data to visualizations:
– Land use change over time (NLCD)• Elevation and remotely sensed changes• Esri has added some temporal features:
– Date/Time attributes– ArcMap is still basically a 2D application
• More complex temporal analysis and visualizations require special software
