Convert coordinates between Latitude/Longitude and Maidenhead.

maidenhead

#+TITLE: maidenhead

This is a Common Lisp library to convert coordinates between Latitude/Longitude
and Maidenhead locator system.

* API

In the library, latitude and longitude are represented by real numbers
(degrees), positive for northern latitude and eastern longitudes, and negative
for southern latitude and western longitudes.


#+BEGIN_SRC lisp
(lat/lon->maidenhead latitude longitude) -> string
#+END_SRC

Return the Maidenhead locator for the given /latitude/ and /longitude/.


#+BEGIN_SRC lisp
(maidenhead->lat/lon locator &optional center-p) -> list
#+END_SRC

Return the latitude and longitude for the southwest corner of the given
Maidenhead /locator/ square, or the center of the square if /center-p/ is
not ~nil~.

* Examples

Load the library:

#+BEGIN_SRC lisp
> (asdf:load-system "maidenhead")
...
#+END_SRC


Get the Maidenhead locator of Munich:

#+BEGIN_SRC lisp
> (maidenhead:lat/lon->maidenhead 48.14666 11.60833)
"JN58td25"
#+END_SRC


Get back the latitude and longitude of Munich:

#+BEGIN_SRC lisp
> (maidenhead:maidenhead->lat/lon "JN58td25" t)
(48.147916666666674d0 11.60416666666666d0)
#+END_SRC

* Tests

The tests require the /fiveam/ library.

#+BEGIN_SRC lisp
(asdf:test-system "maidenhead")
#+END_SRC


maidenhead

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