Monitoring delivered packages using video

A method comprising:

• maintaining a plurality of models of a scene representing an area of a property, the plurality of models including, for each of a plurality of different environmental conditions, a corresponding model of the scene;
• determining a current environmental condition at the property;
• selecting, from the plurality of models, a particular model using the current environmental condition at the property;
• and
• tracking a package using the particular model.

A non-transitory computer-readable medium storing software comprising instructions executable by one or more computers which, upon such execution, cause the one or more computers to perform operations comprising:

• maintaining a plurality of models of a scene representing an area of a property, the plurality of models including, for each of a plurality of different environmental conditions, a corresponding model of the scene;
• determining a current environmental condition at the property;
• selecting, from the plurality of models, a particular model using the current environmental condition at the property;
• and
• tracking a package using the particular model.

A system comprising one or more computers and one or more computer storage media storing instructions that are operable, when executed by the one or more computers, to cause the one or more computers to perform operations comprising:

• maintaining a plurality of models of a scene representing an area of a property, the plurality of models including, for each of a plurality of different environmental conditions, a corresponding model of the scene;
• determining a current environmental condition at the property;
• selecting, from the plurality of models, a particular model using the current environmental condition at the property;
• and
• tracking a package using the particular model.