### LineString Start and End Points Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/defaults.md Provides functions to get the starting and ending points of a LineString. It relies on the `getpoint` function and the length of the geometry. ```Julia startpoint(geom) = getpoint(geom, 1) endpoint(geom) = getpoint(geom, length(geom)) ``` -------------------------------- ### GeoInterface.jl Point Implementations Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/defaults.md Demonstrates how GeoInterface.jl is implemented for NTuples, NamedTuples, and AbstractVectors to behave as Points. It shows examples of accessing X, Y, and Z coordinates. ```Julia a = [1, 2, 3] GeoInterface.x(a) == 1 b = (1, 2, 3) GeoInterface.y(b) == 2 c = (;X=1, Y=2, Z=3) GeoInterface.z(c) == 3 ``` -------------------------------- ### Polygon Wrapper Construction Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/defaults.md Shows how to construct a Polygon using the GeoInterface.jl wrapper type, accepting interior and hole geometries. ```Julia poly = Polygon([interior, hole1, hole2]) ``` -------------------------------- ### GeoInterface.jl Function Name Mapping Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/background/sf.md This snippet illustrates the mapping of Simple Features (SF) function names to their GeoInterface.jl equivalents, highlighting changes like prefix removal, lowercasing, and generalization for better Julia integration. ```Julia GeometryType -> geomtrait NumGeometries -> ngeom GeometryN -> getgeom NumPatches -> npatch ``` ```Julia coordinateDimension -> ncoords # x, y, z, m dimension -> unused spatialDimension -> unused ``` ```Julia SRID -> crs # also aliased to bbox ``` ```Julia coordnames = (:X, :Y, :Z, :M) ``` -------------------------------- ### Test Geometry Interface Implementation Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Utilize GeoInterface.jl's test suite to verify the correct implementation of geometry traits for custom geometry types. ```Julia GeoInterface.testgeometry(geom) GeoInterface.testfeature(geom) ``` -------------------------------- ### GeoInterface.jl: Feature and Geometry Methods (Julia) Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/background/history.md This snippet outlines the methods maintained for backwards compatibility with pre-v1 releases of GeoInterface.jl. It includes methods for accessing geometry and properties of features, and coordinates of geometries. ```Julia # for Features isfeature geometry properties # for Geometries coordinates ``` -------------------------------- ### Implement Point Geometry Traits Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Implement GeoInterface.jl traits for a custom Point geometry. This includes `geomtrait`, `ncoord`, and `getcoord`. ```Julia GeoInterface.geomtrait(geom::customgeom)::DataType = PointTrait() GeoInterface.ncoord(::PointTrait, geom::customgeom)::Integer GeoInterface.getcoord(::PointTrait, geom::customgeom, i)::Real # Defaults GeoInterface.ngeom(::PointTrait, geom)::Integer = 0 GeoInterface.getgeom(::PointTrait, geom::customgeom, i) = nothing ``` -------------------------------- ### GeoInterface.jl MultiLineString Trait Methods Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Outlines the methods necessary for a custom geometry type to implement the MultiLineStringTrait. This includes defining the trait, the number of coordinates, and accessing individual LineString geometries. ```Julia GeoInterface.geomtrait(geom::customgeom) = MultiLineStringTrait() GeoInterface.ncoord(::MultiLineStringTrait, geom::customgeom)::Integer # These alias for nlinestring and getlinestring GeoInterface.ngeom(::MultiLineStringTrait, geom::customgeom)::Integer GeoInterface.getgeom(::MultiLineStringTrait,geom::customgeomm, i)::"LineStringTrait" ``` -------------------------------- ### Geospatial Operations Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Perform common geospatial operations such as distance calculation, buffering, and convex hull computation using GeoInterface.jl. ```Julia distance(geomtrait(a), geomtrait(b), a, b) buffer(geomtrait(geom), geom, distance) convexhull(geomtrait(geom), geom) ``` -------------------------------- ### Implement LineString Geometry Traits Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Implement GeoInterface.jl traits for a custom LineString geometry. This includes `geomtrait`, `ncoord`, and aliases for point-related methods. ```Julia GeoInterface.geomtrait(geom::customgeom)::DataType = LineStringTrait() GeoInterface.ncoord(::LineStringTrait, geom::customgeom)::Integer # These alias for npoint and getpoint GeoInterface.ngeom(::LineStringTrait, geom::customgeom)::Integer GeoInterface.getgeom(::LineStringTrait, geom::customgeom, i) # of geomtrait Point # Optional GeoInterface.isclosed(::LineStringTrait, geom::customgeom)::Bool GeoInterface.issimple(::LineStringTrait, geom::customgeom)::Bool GeoInterface.length(::LineStringTrait, geom::customgeom)::Real ``` -------------------------------- ### GeoInterface.jl MultiPoint Trait Methods Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Details the methods required for a custom geometry type to implement the MultiPointTrait. This involves defining the trait, the number of coordinates, and accessing individual points. ```Julia GeoInterface.geomtrait(geom::customgeom) = MultiPointTrait() GeoInterface.ncoord(::MultiPointTrait, geom::customgeom)::Integer # These alias for npoint and getpoint GeoInterface.ngeom(::MultiPointTrait, geom::customgeom)::Integer GeoInterface.getgeom(::MultiPointTrait, geom::customgeom, i)::"PointTrait" ``` -------------------------------- ### Geospatial Sets Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Perform set operations on geometries, including symmetric difference, difference, intersection, and union. ```Julia symdifference(geomtrait(a), geomtrait(b), a, b) difference(geomtrait(a), geomtrait(b), a, b) intersection(geomtrait(a), geomtrait(b), a, b) union(geomtrait(a), geomtrait(b), a, b) ``` -------------------------------- ### Point Count Fallbacks Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/defaults.md Implements fallback methods for `npoint` for various geometric types like Line, Triangle, Rectangle, Quad, Pentagon, and Hexagon, returning a fixed number of points. ```Julia npoint(::LineTrait, geom) = 2 npoint(::TriangleTrait, geom) = 3 npoint(::RectangleTrait, geom) = 4 npoint(::QuadTrait, geom) = 4 npoint(::PentagonTrait, geom) = 5 npoint(::HexagonTrait, geom) = 6 ``` -------------------------------- ### Using GeoInterface with ArchGDAL Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/tutorials/usage.md Demonstrates how to use GeoInterface.jl functions with geometries from the ArchGDAL package. It shows how to inspect a geometry and retrieve its coordinates using the generic interface. ```julia using ArchGDAL geom = createpolygon(...)::ArchGDAL.IGeometry # no idea about the interface # Inspect with GeoInterface methods isgeometry(geom) geomtrait(geom) ext = exterior(geom); geomtrait(ext) getcoords.(getpoint.(Ref(ext), 1:npoint(ext))) coordinates(geom) # fallback based on ngeom & npoint above ``` -------------------------------- ### Implement Polygon Geometry Traits Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Implement GeoInterface.jl traits for a custom Polygon geometry. This includes `geomtrait`, `ncoord`, and aliases for ring-related methods. ```Julia GeoInterface.geomtrait(geom::customgeom)::DataType = PolygonTrait() GeoInterface.ncoord(::PolygonTrait, geom::customgeom)::Integer # These alias for nring and getring GeoInterface.ngeom(::PolygonTrait, geom::customgeom)::Integer GeoInterface.getgeom(::PolygonTrait, geom::customgeom, i)::"LineStringTrait" ``` -------------------------------- ### Implement Feature Interface Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Implement the GeoInterface.jl traits for a custom Feature type. This involves defining methods for `isfeature`, `properties`, and `geometry`. ```Julia GeoInterface.isfeature(feat::customfeat)::Bool = true GeoInterface.properties(feat::customfeat) GeoInterface.geometry(feat::customfeat) ``` -------------------------------- ### GeoInterface.jl Polygon Trait Methods Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Defines the methods required for a custom geometry type to implement the PolygonTrait in GeoInterface.jl. These include calculating area, centroid, finding a point on the surface, and retrieving the boundary. ```Julia GeoInterface.area(::PolygonTrait, geom::customgeom)::Real GeoInterface.centroid(::PolygonTrait, geom::customgeom)::"PointTrait" GeoInterface.pointonsurface(::PolygonTrait, geom::customgeom)::"PointTrait" GeoInterface.boundary(::PolygonTrait, geom::customgeom)::"LineStringTrait" ``` -------------------------------- ### Implement CRS Method Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Optionally implement the `crs` method to specify the Coordinate Reference System for a custom collection. This method should return a GeoFormatTypes.CoordinateReferenceSystem type. ```Julia GeoInterface.crs(::customcollection) ``` -------------------------------- ### GeoInterface.jl MultiPolygon Trait Methods Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Specifies the methods required for a custom geometry type to implement the MultiPolygonTrait. This involves defining the trait, the number of coordinates, and accessing individual Polygon geometries. ```Julia GeoInterface.geomtrait(geom::customgeom) = MultiPolygonTrait() GeoInterface.ncoord(::MultiPolygonTrait, geom::customgeom)::Integer # These alias for npolygon and getpolygon GeoInterface.ngeom(::MultiPolygonTrait, geom::customgeom)::Integer GeoInterface.getgeom(::MultiPolygonTrait, geom::customgeom, i)::"PolygonTrait" ``` -------------------------------- ### Implement Optional Geometry Functions in Julia Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Provides optional generic methods for GeoInterface to help with locating custom geometries, such as defining the Coordinate Reference System (CRS) and the extent. These methods can improve interoperability and provide fallback calculations if not explicitly defined. ```Julia GeoInterface.crs(trait(geom), geom::customgeom)::GeoFormatTypes.CoordinateReferenceSystem GeoInterface.extent(trait(geom), geom::customgeom)::Extents.Extent ``` -------------------------------- ### Implement Geometry Conversion in Julia Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Details the methods required for converting custom geometry types into other GeoInterface-compatible geometry types. This involves defining a `convert` function that utilizes GeoInterface methods to perform the transformation. ```Julia # This method will get called on GeoInterface.convert(::Type{T}, geom) # if geomtrait(geom) == LineStringTrait() GeoInterface.convert(::Type{CustomLineString}, ::LineStringTrait, geom) = ... GeoInterface.convert(::Type{CustomPolygon}, ::PolygonTrait, geom) = ... ``` -------------------------------- ### GeoInterface.jl GeometryCollection Trait Methods Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Specifies the methods needed for a custom geometry type to represent a GeometryCollection. This includes defining the trait, the number of coordinates, the number of sub-geometries, and accessing individual sub-geometries. ```Julia GeoInterface.geomtrait(geom::customgeom) = GeometryCollectionTrait() GeoInterface.ncoord(::GeometryCollectionTrait, geom::customgeom)::Integer GeoInterface.ngeom(::GeometryCollectionTrait, geom::customgeom)::Integer GeoInterface.getgeom(::GeometryCollectionTrait,geom::customgeomm, i)::"GeometryTrait" ``` -------------------------------- ### Implement Geometry Interface (Base) Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Implement the base GeoInterface.jl trait for a custom geometry type, ensuring `isgeometry` is defined. ```Julia GeoInterface.isgeometry(geom::customgeom)::Bool = true ``` -------------------------------- ### Implement FeatureCollection Interface Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Implement the GeoInterface.jl traits for a custom FeatureCollection type. This includes methods for `isfeaturecollection`, `getfeature`, `nfeature`, and `geometrycolumns`. ```Julia GeoInterface.isfeaturecollection(::Type{customcollection}) = true GeoInterface.getfeature(trait(::customcollection), ::customcollection, i) GeoInterface.nfeature(trait(::customcollection), ::customcollection) GeoInterface.geometrycolumns(::customcollection) = (:geometry,) ``` -------------------------------- ### Geospatial Relations (DE-9IM) Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Determine the spatial relationships between geometries based on the Dimensionally Extended 9-Intersection Model (DE-9IM). ```Julia equals(geomtrait(a), geomtrait(b), a, b) disjoint(geomtrait(a), geomtrait(b), a, b) intersects(geomtrait(a), geomtrait(b), a, b) touches(geomtrait(a), geomtrait(b), a, b) within(geomtrait(a), geomtrait(b), a, b) contains(geomtrait(a), geomtrait(b), a, b) overlaps(geomtrait(a), geomtrait(b), a, b) crosses(geomtrait(a), geomtrait(b), a, b) relate(geomtrait(a), geomtrait(b), a, b, relationmatrix) ``` -------------------------------- ### Implement Required Geometry Functions in Julia Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Defines the essential functions required for a custom geometry type to be compatible with GeoInterface. This includes identifying the geometry, specifying its trait, and providing methods for accessing coordinates or sub-geometries. ```Julia GeoInterface.isgeometry(geom::customgeom)::Bool = true GeoInterface.geomtrait(geom::customgeom)::DataType = XTrait() # <: AbstractGeometryTrait # for PointTraits GeoInterface.ncoord(geomtrait(geom), geom::customgeom)::Integer GeoInterface.getcoord(geomtrait(geom), geom::customgeom, i)::Real # for non PointTraits GeoInterface.ngeom(geomtrait(geom), geom::customgeom)::Integer GeoInterface.getgeom(geomtrait(geom), geom::customgeom, i) ``` -------------------------------- ### Implement Required Raster Functions in Julia Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/developer.md Specifies the essential functions for integrating custom raster types with GeoInterface. This includes identifying the raster, assigning a trait, and defining methods for its extent and CRS. ```Julia GeoInterface.israster(raster::customraster)::Bool = true GeoInterface.trait(::customraster) = RasterTrait() GeoInterface.extent(::RasterTrait, raster::customraster)::Extents.Extent GeoInterface.crs(::RasterTrait, raster::customraster)::GeoFormatTypes.CoordinateReferenceSystem ``` -------------------------------- ### GeoInterface Functions Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/tutorials/usage.md A set of generic functions provided by GeoInterface.jl for inspecting and accessing properties of geospatial geometries. These functions allow for consistent interaction with different geometry types. ```julia isgeometry(geom) geomtrait(geom) ncoord(geom) getcoord(geom, i) ... ``` -------------------------------- ### Polygon Geometry Functions Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/guides/defaults.md Defines functions for accessing the exterior ring and holes of a polygon. It assumes the first ring is the exterior and subsequent rings are holes, with a fallback for cases where this assumption might not hold. ```Julia getexterior(p::AbstractPolygonTrait, geom) = getring(p, geom, 1) nhole(p::AbstractPolygonTrait, geom) = nring(p, geom) - 1 gethole(p::AbstractPolygonTrait, geom, i) = getring(p, geom, i + 1) ``` -------------------------------- ### GeoInterface Trait Types Source: https://github.com/juliageo/geointerface.jl/blob/main/docs/src/tutorials/usage.md A set of trait types used by GeoInterface.jl for dispatching within its functions. These types define how the library interprets input geometry objects and are specific to each geometry type. ```julia abstract GeometryTrait PointTrait <: AbstractPointTrait <: AbstractGeometryTrait MultiPointTrait <: AbstractMultiPointGeometryTrait <:AbstractGeometryCollectionTrait <: AbstractGeometryTrait ... ``` === COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.