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 <[email protected]> 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 <[email protected]> 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 <[email protected]> > wrote: > >> > >> Hi Alistair, > >> > >>> On 4 Dec 2018, at 10:21, Alistair Grant <[email protected]> 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: [email protected] and: [email protected]. > >> T3GeoTools bearingFrom: [email protected] to: [email protected]. > >> T3GeoTools destinationFrom: [email protected] bearing: 45 distance: 2500. > >> T3GeoTools centroidOf: { [email protected]. [email protected]. > [email protected]. [email protected]. [email protected]. [email protected] }. > >> T3GeoTools is: [email protected] inside: { [email protected]. > [email protected]. [email protected]. [email protected]. [email protected]. > [email protected] }. > >> > >> 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 > >> > >> > > > >
