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I´m trying to model building rooftops based on a LiDAR dataset. I've already interpolated using Delaunay's triangulation a DEM with 1 meter resolution. Due to LiDAR data is not accurate in building edges, I managed to get cadastre data so I have building boundaries.

Does anyone know how to build a 3D model of rooftops based on the previously mentioned inputs (DEM and cadastre data).

Any help would be highly appreciated.

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Use the aerial imagery to get the horizontal building dimensions, width and length. Use the LIDAR for vertical measurements to know what the heights are.

If you want an automated method you're probably not going to find it in free software.

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  • The asker does not say that aerial imagery is available nor does he say that he is looking for free software to do this.
    – PolyGeo ♦
    Commented Jul 10, 2013 at 6:54
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    I'm supposed to believe he has lidar data but not access to google earth?
    – Chad
    Commented Jul 10, 2013 at 14:26

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