[R-sig-Geo] measuring longitudes as if they were parallels?

[Loïc Dutrieux]

Hi John,

Possibly what you're looking for is in the geosphere package 
(https://cran.r-project.org/web/packages/geosphere/geosphere.pdf).

Cheers,
Loïc

On 07/31/2015 04:47 PM, john d wrote:
> Dear all,
>
> Here's another issue that I've been struggling with and I'd really
> appreciate any input.
>
> I want to compare the latitudinal and longitudinal extents of different
> shapefiles. Comparing latitudes is straightforward because they are
> measured as parallels, so they are "self-referential". However, measuring
> longitudes is always tricky because, as they are represented as meridians,
> longitudinal degrees always depend on their latitude.
>
> Is there a way to represent longitudes that is also self-referential?
> Perhaps some transformation?
>
> Any discussion in this respect will be greatly appreciated.
>
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>
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