[1] The modifications were to ensure a consistent composite grouping of buildings which were represented in the site model as multiple cubes. Several of such complex-structure buildings were already present as composite objects. We manually rounded out the site model to assure consistency in the modeling.

[2] In the current implementation, groups are created by humans. Future work extending our ideas would involve providing tools for moving this into a semi-automated task.

[3] The road is shown divided into bounding boxes segment-wise. The rectangular boxes are used for a rough test of nearness. A more sophisticated test which implements a smooth envelope is used for the final comparison.