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

[john d]

Cool. I'll look into that. Thanks. Loïc!

On Fri, Jul 31, 2015 at 3:44 PM, john d <dobzhanski at gmail.com> wrote:

> Cool. I'll look into that. Thanks. Loïc!
>
> On Fri, Jul 31, 2015 at 1:21 PM, Loïc Dutrieux <loic.dutrieux at wur.nl>
> wrote:
>
>> 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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>
>

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