LibGEOS.jl

LibGEOS is a package for manipulation and analysis of planar geometric objects, based on the libraries GEOS (the engine of PostGIS) and JTS (from which GEOS is ported).

Among other things, it allows you to parse Well-known Text (WKT)

p1 = readgeom("POLYGON((0 0,1 0,1 1,0 0))")
p2 = readgeom("POLYGON((0 0,1 0,1 1,0 1,0 0))")
p3 = readgeom("POLYGON((2 0,3 0,3 1,2 1,2 0))")

Example 1

Add a buffer around them

g1 = buffer(p1, 0.5)
g2 = buffer(p2, 0.5)
g3 = buffer(p3, 0.5)

Example 2

and take the union of different geometries

polygon = LibGEOS.union(g1, g3)

Example 3

GEOS functionality is extensive, so coverage is incomplete, but the basic functionality for working with geospatial data is already available. I'm learning as I go along, so documentation is lacking, but if you're interested, you can have a look at the examples in the examples/ folder, or the tests in test/test_geo_interface.jl and test/test_geos_operations.jl.

Installation

At the Julia prompt, run

pkg> add LibGEOS

This will install both the Julia package and GEOS shared libraries together. The GEOS build comes from GEOS_jll, and the build script can be found in Yggdrasil.

Test that LibGEOS works by runnning

pkg> test LibGEOS