Re: [R] code to convert 3D geographical coordinates to Cartesian?

[David Winsemius]

On Dec 30, 2012, at 8:14 PM, Tom Roche wrote:

https://stat.ethz.ch/pipermail/r-help/2012-December/332658.html
Is there packaged code to convert geographical coordinates (e.g.,
longitude, latitude, elevation) to Cartesian coordinates in 3-space?
...
Net: the task seems straightforward enough, but there's certainly
scope for error, so I'd prefer to use tested, well-used code if
available.

https://stat.ethz.ch/pipermail/r-help/2012-December/332666.html
Have you checked the spatial stats task view on CRAN?

http://cran.r-project.org/web/views/Spatial.html

I have, and can't believe that functionality this fundamental is not
API.

You have a very different notion of what would be considered core  
capabilities in a statistics program than I have.

But I have looked at several packages and am not seeing it. I
suspect that either it's so low-level that it's just not exposed as  
API,
or just that there is API but I'm not seeing it in the package docs
("hidden in plain sight"). Hence I ask

Am I missing something?

How did you search?

install.packages("sos")
require(sos)
> findFn("latitude longitude cartesian")

Two different packages with functions that sound as though they might  
be useful.

sphereplot::sph2car  "Transforms 3D spherical coordinates to cartesian  
coordinates"

GEOmap::Lll2xyz "List Lat-Lon to cartesian XYZ"


--
David.

David Winsemius, MD
Alameda, CA, USA

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