Yes. The MapBrowser's measurement tools use appropriate local representations of the Earth's surface and are typically accurate to +/- 15cm for distances up to 200m.
The technical term for our PhotoMaps™ is that they are mosaics of orthorectified images. This means that each raw photo that goes into making up our PhotoMaps has had the full orthorectification process applied, including removal of terrain distortions, lens distortions and so on. Individual orthoimages are then merged together into a mosaic, which is the PhotoMap™ that you see on our map portal. We generate high resolution elevation maps as a necessary part of the orthorectification process (so that terrain distortions can be removed).
The bundle adjustment stage of our HyperVision™ supercomputer-based photogrammetry processing system performs full interior and exterior orientation of cameras and photos, including self-calibration of cameras. Self-calibration is the most accurate form of computing the metric camera interior orientation and lens parameters. A unique feature of our HyperPod™ and HyperCamera™ aerial camera systems is that they capture many more photos observing a given point on the ground (e.g. very high photo redundancy) compared to older aerial camera systems. This enables our processing system to handle difficult situations such as cloud and smoke, and also means it has a far lower blunder rate than older orthophoto solutions. Our HyperVision processing is fully automated, and designed to create PhotoMaps anywhere in the world, without requiring any ground control point data at all. This also allows us to capture accurate PhotoMaps in adverse conditions where ground point data is not available, is obscured, has moved or is inaccurate.
To take advantage of Nearmap’s accurate PhotoMap georeferencing, you need to ensure that all aspects of map projection and datum transformations are handled by your GIS or CAD system when it merges different sources of data. For example, Nearmap uses Datum Epochs ranging from 2009.0 to the present. Many systems do not take epochs into account correctly or at all when performing map projection conversions, and assume an older epoch such as 1994.0. Failure to take the epoch into account during datum conversions can result in errors due to incorrect datum transformations. Australia, for example, has fairly rapid continental drift in the order of 7cm per year, which may lead to errors of up to 1m during datum conversions if epoch is not considered. In the United States, by contrast, continental drift is usually an order of magnitude smaller.
In any case, to ensure accurate georeferencing of Nearmap’s PhotoMaps, it is vital that your processing systems correctly take datum, projection and epoch transformations correctly into account.