|How accurate is the Lat/Lng that you get from SV API's getPosition()?||Kotaro Hara||3/26/13 9:17 AM|
I am using Street View Service to develop my application that is similar to this example. In this application, I want to store where, in lat/lng coordinates, users have traveled on the map. I figured out StreetViewPanorama class provides an API, getPosition(), and this returns LatLng. Lat/lng coordinates you extract from LatLng object look like lat=38.924066 and lng=-77.032172. I can use these values to store what I want.
Although the aforementioned latlng values have 8 significant figures, I was actually wondering how accurate these values are, because GPS locations that Google collects while running a Street View car would have errors. My question is, how accurate is the latlng value returned by getPosition()? In other words, how much concordance can I expect between latlng values from getPosition() and latlng position on Google Map?
Thank you very much!
|Re: How accurate is the Lat/Lng that you get from SV API's getPosition()?||barryhunter||3/26/13 10:17 AM|
A 6dp lat/long is on the order of precise to 0.1m. (ie 10cm)
So such a lat/long should match up very precisely with the Google Map. Ie its a precise location.
But as to how accurate the underlying map is, that varies a lot. Its almost impossible to tell. Most locations I would estimate to be within about 6-30m
|Re: How accurate is the Lat/Lng that you get from SV API's getPosition()?||Kotaro Hara||3/26/13 11:12 AM|
Thank you so much for your response!
Do you have source for this? It would be a great help if you do.
Great point. I was wondering how accurate the Google Map is in the first place (or rather what would be the ground truth.)
Thank you very much for the information!
|Re: How accurate is the Lat/Lng that you get from SV API's getPosition()?||barryhunter||3/26/13 11:39 AM|
I didnt quote the exact figure, because the actual numbers vary with latitude (which is why it actully asks for coordinates) - just a general figure.
(disclosure, I made the above page!)
|Re: How accurate is the Lat/Lng that you get from SV API's getPosition()?||Kotaro Hara||3/28/13 9:56 AM|
Great! Thank you Barryhunter :)