As Dershowitz and Reingold showed in their book "Calendrical Calculations",
converting from UTC to several calendars needs latitude, longitude, and
elevation. ISO 6709 is the relevant standard:
https://en.wikipedia.org/wiki/ISO_6709
On Tue, 4 Dec 2018 at 23:35, Cédrick Béler <cdric...@gmail.com> wrote:
> Interesting.
>
> I’m interested with such tools too.
>
> I ask students to do gps point collection from mobile (Cordova) and
> process them in pharo to detect if they enter known places.
>
> I wonder if a proper gps point class would be useful. I’d like to record
> also the precision.
>
> Cheers,
>
> Cedrick
>
>
>
> > Le 4 déc. 2018 à 11:15, Alistair Grant <akgrant0...@gmail.com> a écrit :
> >
> > Hi Sven,
> >
> > Thanks. This is just for me playing around with my photo collection,
> > i.e. find all photos from a particular location, i.e. within a
> > specified distance of a point. Also maybe add GPS coordinates to some
> > photos.
> >
> > Thanks again,
> > Alistair
> >
> >> On Tue, 4 Dec 2018 at 11:04, Sven Van Caekenberghe <s...@stfx.eu>
> wrote:
> >>
> >> Hi Alistair,
> >>
> >>> On 4 Dec 2018, at 10:21, Alistair Grant <akgrant0...@gmail.com> wrote:
> >>>
> >>> Hi,
> >>>
> >>> Does anyone know of a library for processing GPS coordinates?
> >>>
> >>> What I'm looking for are things like:
> >>>
> >>> - Parsing from and printing to various string formats (HMS, NESW,
> decimal)
> >>> - Distance between two points
> >>> - etc.
> >>>
> >>> Thanks,
> >>> Alistair
> >>
> >> We've got some elementary stuff based on WGS84 coordinates as points.
> For example,
> >>
> >> T3GeoTools distanceBetween: 5.33732@50.926 and: 5.49705@50.82733.
> >> T3GeoTools bearingFrom: 5.33732@50.926 to: 5.49705@50.82733.
> >> T3GeoTools destinationFrom: 5.33732@50.926 bearing: 45 distance: 2500.
> >> T3GeoTools centroidOf: { 5.48230@50.82249. 5.49523@50.81288.
> 5.50138@50.82008. 5.50228@50.82595. 5.49265@50.82560. 5.48230@50.82249 }.
> >> T3GeoTools is: 5.33732@50.92601 inside: { 5.48230@50.82249.
> 5.49523@50.81288. 5.50138@50.82008. 5.50228@50.82595. 5.49265@50.82560.
> 5.48230@50.82249 }.
> >>
> >> This is not open source, but it is not rocket science either (just
> implementations of public algorithms).
> >>
> >> We have less need for special conversions, we do them case by case when
> they occur.
> >>
> >> What are you planning to do ?
> >>
> >> Sven
> >>
> >>
> >
>
>
