Abstract: Systems, methods and instructions for creating building models of physical structures is disclosed. The building model may be a collection of floors defined by outlines containing regions that may be offset relative to a main region, and a collection of connectors. Connectors may have connection points for tracking, routing and sizing. Connectors may indicate elevation changes through georeferenced structural features. Signal elements may also be features that provide corrections when tracking. Feature descriptors are data that describes the structural configuration and signal elements enabling them to be matched to previously collected data in a database. User interface elements assist a user of a tracking device in collecting floor information, structural features and signal features and validating certain collected information based on previously known information. The height of floors may also be inferred based on sensor data from the tracking device.

Abstract: A pet domicile is mounted exterior to a house adjacent an exterior door of the house, the door having a pet operated pet door therethrough. A flexible tunnel connects the pet door to an entrance opening of the pet domicile, permitting the pet to access the domicile from the house and the flexible tunnel permitting normal outward opening of the exterior door of the house.