Originally Posted by Michael Scrip I want to know where Apple and Google gets these addresses in the first place. If we knew that, we'd at least have a place to start making corrections.
No one seems to know where they get this data from... yet all the POI data is dependent upon it.
You'd have to contact the individual companies in question, but in many cases, there are clues in the copyright block for the mapping service. Sources like Navteq, TomTom, OpenStreetMap, etc. are often quoted, so those are some of the original sources.
If Navteq put your nearby pizzeria on the wrong block on their maps, and Big Internet Company X buys Navteq's map data, well, Big Internet Company X's map will have that pizzeria on the wrong block.
Note that Big Internet Company X's deal with the map provider may not include incremental updates. If that is the case, it is up to Big Internet Company X to make their own changes to the original dataset. Now if you were Big Internet Company X and you identified the correct location of the nearby pizzeria using their own team/effort, would you contact the map vendor and tell them their data was wrong? No, you'd keep the new/updated information to yourself and your map would be a bit more accurate than theirs.
If there is an original data source, you will find that information if you dig deep enough due to copyright law.
Remember that a map dataset is like a photograph, a snapshot in time. If I buy a map from the gas station, or if I pick one up from the AAA office, that's a map that covers street data from a narrow time band. It won't list the previous names of streets, it won't show new construction (like the new eastern span of the SF Bay Bridge). Unless the map vendor and the customer agree on terms for periodic data updates, it's likely a one-time dataset purchase.
Based on Apple's behavior (including acquisition of numerous mapping companies), it is highly likely that Apple made a one-time map dataset purchase and walked away, believing that they would be able to do a better job at updating the dataset themselves versus subscribing to updates from the map vendor.
Edited by mpantone - 7/12/14 at 4:04pm