3D city models are being extensively used in applications such as evacuation scenarios and energy consumption estimation. The main standard for 3D city models is the CityGML data model which can be encoded through the CityJSON data format. CityGML and CityJSON use polygonal modelling in order to represent geometries. https://lecoureures.shop/product-category/ski-de-fond-equipement-fixations-pieces-de-rechange/