# val3dity¶

(version 2.1)

val3dity—pronounced ‘val-three-dity’—allows us to validate 3D primitives according to the international standard ISO19107. Think of it as PostGIS ST_IsValid, but for 3D primitives (PostGIS is only for 2D ones).

In short, it verifies whether a 3D primitive respects the definition as given in ISO19107 and GML/CityGML. The validation of the following 3D primitives is fully supported:

• MultiSurface
• CompositeSurface>
• Solid
• MultiSolid
• CompositeSolid

Unlike many other validation tools in 3D GIS, inner rings in polygons/surfaces are supported, and so are cavities in solids (also called voids or inner shells). However, only planar and linear primitives are allowed: no curves or spheres or other parametrically-modelled primitives are supported (and there is no plan to do so!).

val3dity accepts as input:

Note

Most of the details are available in this scientific article, if you use val3dity for scientific purposes please cite this article:

Ledoux, Hugo (2013). On the validation of solids represented with the international standards for geographic information. Computer-Aided Civil and Infrastructure Engineering, 28(9):693-706. [PDF] [DOI]

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