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From my understanding the current version of QGIS does not have 3D capabilities. You would have do, as you stated, 3D work in PostGIS or Spatialite. There may be a method to do the 3D functions you are inquiring about in Grass, which has a QGIS plugin.


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Yes, the default SRID in PostGIS is zero meaning unknown or local coordinate system. You can take advantage of all geometry-based queries and functions -- except any that transform or project between known coordinate systems. (Geography-based queries and functions won't make any sense.)


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As Chris W says, ArcScene is your best bet if you want to stay in the 'Arc' world without 3rd party extensions. You have 3 options to choose from. (View -> View Settings -> Viewing Characteristics -> Stereo View - Method) Shutter Glasses: Requires the hardware your friend is referring to. Red/Blue anaglyth: Think old school 3d glasses. Probably not ideal ...


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With ArcGIS, I suppose you have to use 3D Analyst but you have also free solutions: Postgis, as ikes says GRASS GIS which is a true 3D GIS (look at Visualization and volumetric 3D examples ) gvSIG can also manipulate 3D geometries and Python modules as Shapely from shapely.geometry import LineString line1 = ...


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I think if you look into PostGIS, using the function ST_3DDWithin, you would find a useful solution.


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You'll need to define both a horizontal coordinate system (could be projected, like UTM) and a vertical coordinate system (like NAVD88, making sure to be in the same units as your horizontal). A vertical coordinate system expresses elevations relative to a baseline, usually a mathematical representation of the Earth's surface. Your measured elevations ...


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No, there is currently no way to full import 3D city models into OSM. The reason is, that OSM 3D abilities use a completely different approach for 'semi 3D' micromapping, while existing formats as City GML use pure 3D models. If you want to mix both aspects, you need to export an OSM 3D model and export your properitary 3D model and combine both in a open ...



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