The new elevation data is a fine feature but for some reason that I don't understand no one seems to want to say what the source of the data is or what the resolution of the data is. See my own unanswered post here http://groups.google.com/group/google-maps-js-api-v3/browse_thread/thread/14e6c6b8f40c6fa4/dd03ea55da41af58#dd03ea55da41af58 and the same unanswered question from ibgpsn here http://groups.google.com/group/google-maps-js-api-v3/browse_thread/thread/a9bab8ca2e4d63d/daa4b0dbe03a1353?lnk=gst&q=elevation#daa4b0dbe03a1353
I have written a short script that compares the two datasets which can be accessed here http://members.chello.at/stephen.joung/indexGoogleHeights_v3_2.html You can enter coordinates or simply click on the map to set two ends of a profile. The elevation of these two markers is then given using the Google elevation data and the SRTM3 elevation data and a profile is shown indicating the heights between these two markers from both the Google ldata and the SRTM3 data. The profile data is called every 100m from the start marker for both datasets. The SRTM3 data offers a resolution of 3arc-seconds (about 90m) and I hope this comparison site will be useful to anyone that needs to check the accuracy of the Google Elevation Data. It would still be nice for us to be told the source and resolution of the Google Elevation Data. BTW, SRTM3 shows sea level as 0m but Google data includes undersea elevations. -- You received this message because you are subscribed to the Google Groups "Google Maps JavaScript API v3" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-maps-js-api-v3?hl=en.
