http://gis.stackexchange.com/questions/53729/extract-elevation-values-along-a-line-using-google-elevation-api

got any ideas how to make this script, or is it already available somewhere?

Wil

On Wednesday, May 26, 2010 4:31:59 PM UTC+10, SteveYoungGoogle wrote:
>
> Thanks Thor,
>
> Thanks for the prompt reply. I understand the difficulty with having
> different suppliers of elevation data and you are correct in saying
> that the resolution is much more important than the source. Therefore
> I think your solution of possibly providing resolution information
> with the elevation responses is an excellent idea.
>
> In the meantime people can use my site to compare the Google data with
> SRTM3 in their geographic area of interest.
>
> Best regards, Steve.
>
> On May 26, 2:39 am, "Thor (Google Employee)" <thor.mitch...@gmail.com>
> wrote:
> > Just FYI, It's not that we do not want to say what the source is. It's
> > just that, as with much of our geo data, we obtain data from many
> > different providers (over 100 for elevation alone) which we stitch
> > together to provide the best possible level of coverage. So we would
> > have to provide source information per request, which is a lot of
> > engineering for little gain.
> >
> > The main reason most developers are asking for source information
> > appears to be because they want to know the resolution. This being the
> > case we are looking into providing resolution information in Elevation
> > responses in future.
> >
> > Many thanks,
> >
> > Thor.
> >
> > On May 25, 9:18 pm, SteveYoungGoogle <stephen.jo...@googlemail.com>
> > wrote:
> >
> > > 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 herehttp://
> groups.google.com/group/google-maps-js-api-v3/browse_thread/th...
> > > and the same unanswered question from ibgpsn herehttp://
> groups.google.com/group/google-maps-js-api-v3/browse_thread/th...
> >
> > > I have written a short script that compares the two datasets which can
> > > be accessed herehttp://
> 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.
> >
> > > --
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> >
>
>

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