PROJ.4 is a cartographic projections library originally written by Gerald Evenden then of the USGS. PROJ.4 has been placed under an MIT license.
CL-PROJ provides CFFI-based Common Lisp bindings for the PROJ.4 library. It is placed under the Berkeley Software Distribution (BSD) license meaning that you can do almost everything you want with it.
PROJ.4 homepage is: proj4.org
Original CL-PROJ homepage was at the cl-proj.sourceforge.net, but current development and documentation is at the Bitbucket.
cl-proj can be installed using the
Quicklisp system:
(ql:quicload :cl-proj)
Library loading and linking into the Lisp image is performed automatically when it is loaded by ASDF/QuickLisp.
Symbols are defined in the cl-proj package and are also available
using the pj package nickname.
Constants, variables and functions are extremely close to the PROJ.4. Bindings for geodesic functions are also provided in addition to the core Proj4 API. Reference is in the <api.html> file that is supplied in the distribution.
Primary development platform is recent Ubuntu Linux distribution with recent versions of SBCL and ECL Common Lisps.
In addition to Proj4 library bindings this package a number of utility functions, including:
-
Parsing degrees from a string and conversion between degree-minutes-seconds and decimal representations
-
Simplification of polygons/polylines (reducing number of vertices) using the Ramer–Douglas–Peucker algorithm
-
Projecting points from a geographic space onto a screen with the given dimensions and viewport
-
Construction of circular lines with the given radius and center (like missile ranges, etc.)
This package has been used to produce some maps in the collection-of-maps (Wiki).
Copyright (c) 2012,2015,2017 Victor Anyakin <anyakinvictor@yahoo.com>
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