add some GPS functions - Githubissues

Qalculate / libqalculate

Qalculate! library and CLI

https://qalculate.github.io/

GNU General Public License v2.0

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add some GPS functions #254

Open eadmaster opened 3 years ago

eadmaster commented 3 years ago

coordinates conversion: decimals <-> degrees
distance between 2 GPS points
geodecoding/encoding (only with the biggest world cities/places)

hanna-kn commented 3 years ago

I've now added a function for calculation of the distance between GPS coordinates (using Vincenty's formulae, or, in case of failure, the Harversine formula).

Coordinates conversion are already supported, e.g. 2°20′24″ = 2.34°, 2.34 to sexa = 2°20′24″ (sexa is here short for sexagesimal). There were some minor issues (′ and ″ was interpreted as feet and inches if there was a Unicode character after "°", and "2.34° to sexa" returned "2°20′24″ × °"), which has now been fixed.

eadmaster commented 3 years ago

nice, is there a way to customize the rounding in the sexagesimal notation? e.g.:

+79.982 to sexa = 79°58′55.2″ should round the seconds, like shown here
-40.446° to ?? can i get the degrees and decimal minutes only from this? (40° 26.767′)

hanna-kn commented 3 years ago

New sexagesimal variants have now been added

latitude, longitude: show absolute value with N, S, W, or E appended
latidue2, longitude2: as latitude/longitude without seconds
sexa2: do not show seconds
sexa3: round to whole seconds

eadmaster commented 3 years ago

thank you for working on this, it looks pretty useful already...