" it would have spotted that it was too dark to see anything and therefore not try to lead me to walk across a wooded park in the middle of the night."
Now normally you have sense Mr Lister... but you're totally going at this problem the wrong way. Why use a server farm of NVidia Teslas, eating a countries Wattage of power, sending 7 camera (you seen the next phone release ;) ) 4D VR, omni direction video tracking with IR and UV ray tracing...
...when the app can just check what time of day it is! (And possibly the location of streetlamps XD )
[Icon for when you walk into said lamppost]