fix GeoInterface for Polygon

Author: joshday

.github/workflows/CI.yml

@@ -12,7 +12,6 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.7'
           - '1' # automatically expands to the latest stable 1.x release of Julia
           - 'nightly'
         os:

Project.toml

@@ -10,7 +10,7 @@ OrderedCollections = "bac558e1-5e72-5ebc-8fee-abe8a469f55d"
 XML = "72c71f33-b9b6-44de-8c94-c961784809e2"
 
 [compat]
-GeoInterface = "1"
+GeoInterface = "1.3"
 OrderedCollections = "1"
 XML = "0.3.0"
 julia = "1"

src/KML.jl

@@ -392,6 +392,7 @@ end
 GeoInterface.geomtrait(o::Polygon) = GeoInterface.PolygonTrait()
 GeoInterface.ngeom(::GeoInterface.PolygonTrait, o::Polygon) = 1 + length(o.innerBoundaryIs)
 GeoInterface.getgeom(::GeoInterface.PolygonTrait, o::Polygon, i) = i == 1 ? o.outerBoundaryIs : o.innerBoundaryIs[i-1]
+GeoInterface.ncoord(::GeoInterface.PolygonTrait, o::Polygon) = length(first(o.outerBoundaryIs.coordinates))
 
 #-----------------------------------------------------------------------------# MultiGeometry <: Geometry
 Base.@kwdef mutable struct MultiGeometry <: Geometry