[R] the volcano orientation

[Ben Tupper]

Hi,

Hmmm.  The only place I have ever seen a georeferenced version of 'volcano'
is here...

https://waterdata.usgs.gov/blog/inlmiscmaps/

It was on the internet so I assumed it was true. Now, I suspect that, since
the original survey by Ross Ihaka, continental drift is happening waaaay
faster than anyone guessed. Could be a decent grant proposal somewhere in
all this.

Seriously, though, I haven't any idea why 'volcano' is the way it is shown,
nor was I awake enough to actually look at a map as you have done. I would
love-love-love to see a georeferenced version be part of the stars package
as example data. It's small enough to be lightweight but has enough
information in it to be handy for meaningful demonstrations. Maybe along
the lines of ...

https://gist.github.com/btupper/8e8eb8c0ebf4402a3f87b5638eca954a

... but with the correct spatial info.

Cheers,
Ben

On Sat, May 9, 2020 at 8:44 PM Michael Sumner <mdsumner using gmail.com> wrote:

> Does anyone know why 'volcano' is oriented as it is?
>
> image(volcano)  ## filled.contour is the same
>
> I know it's all arbitrary, but north-up is a pretty solid convention. Is
> there any reason why the classic 'image()' example data set would not
> default to this orientation?
>
> A Google map of the site (in Web Mercator):
>
>
> https://www.google.com/maps/place/Maungawhau+%2F+Mount+Eden/@-36.8763271,174.7619561,856m/data=!3m1!1e3!4m8!1m2!2m1!1smaungawhau!3m4!1s0x6d0d47db8d7bd1ff:0x8bcffe2a5c7360d2!8m2!3d-36.8666667!4d174.7666667
>
>
> For image(), the north-up orientation is 't(volcano[,ncol(volcano):1])'.
>
> If you are interested in a roughly georeferenced version I have code here:
>
> https://gist.github.com/mdsumner/20fe3ffa04421bf8e0517c19085e5fd8
>
> (Also see fortunes::fortune("conventions") )
>
> Best, Mike
>
>
> --
> Michael Sumner
> Software and Database Engineer
> Australian Antarctic Division
> Hobart, Australia
> e-mail: mdsumner using gmail.com
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Ben Tupper
Bigelow Laboratory for Ocean Science
East Boothbay, Maine
http://www.bigelow.org/
https://eco.bigelow.org

	[[alternative HTML version deleted]]