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The below figure depicts a example of a 3D city model that can be used as input. windows, balconies, balcony railings, etc.

3D city model including detailed building exterior information (equivalent to CityGML LOD4) like e.g.

Sunlight exposure is regulated by the Swedish Standard, which is based on the European Standard EN 17037 - Daylight in Buildings, and states that at minimum one room in an apartment has to receive at least 1.5 hours of direct sunlight on one day between February 1st and March 21st of a year.

balconies, balcony railings, etc.) of buildings represented in a high level of detail affect the results of daylight metric simulations such as the Sunlight Exposure (here expressed as direct sun hours).

The goal is to examine how including or excluding obstructing gemmetries (e.g. Some of the buildings in the study area are represented in high level of detail (equivalent to CityGML LOD4), while others are represented in a lower level of detail (equivalent to CityGML LOD2). The Grasshopper script-file included in this repository is used for computing the direct sun hours on windows and balcony doors of a set of buildings in a neighbourhood.