Google maps are useless , they are always 2 - 3 years out of date.
Nearmaps is better , they take high resolution overhead pictures from a plane flyover , Nearmaps is based in Perth and have done quite detailed photo scans of the Perth / country towns and have expanded to most capital cities on a limited basis.
The resolution can go down to 2 - 4 metres and all the pics have a date stamp.
Up until recently you could browse all the pics , but now they want to create a FREE account so you can see all the pics.
The pics are great for perving on your neighbour's backyard. :)