ngen::geopackage Namespace Reference

Classes
struct	wkb
	A recursive WKB reader. More...

Enumerations
enum	wkb_geom_t {   geometry = 0 ,   point = 1 ,   linestring = 2 ,   polygon = 3 ,   multipoint = 4 ,   multilinestring = 5 ,   multipolygon = 6 ,   geometry_collection = 7 }

Functions
geojson::geometry	build_geometry (const ngen::sqlite::database::iterator &row, const std::string &geom_col, std::vector< double > &bounding_box)
	Build a geometry object from GeoPackage WKB.
geojson::PropertyMap	build_properties (const ngen::sqlite::database::iterator &row, const std::string &geom_col)
	Build properties from GeoPackage table columns.
geojson::Feature	build_feature (const ngen::sqlite::database::iterator &row, const std::string &id_col, const std::string &geom_col)
	Build a feature from a GPKG table row.
std::shared_ptr< geojson::FeatureCollection >	read (const std::string &gpkg_path, const std::string &layer, const std::vector< std::string > &ids)
	Build a feature collection from a GPKG layer.
void	throw_if_not_type (uint32_t given, wkb_geom_t expected)

Enumeration Type Documentation

wkb_geom_t

enum ngen::geopackage::wkb_geom_t

Enumerator
geometry
point
linestring
polygon
multipoint
multilinestring
multipolygon
geometry_collection

Function Documentation

build_feature()

geojson::Feature ngen::geopackage::build_feature	(	const ngen::sqlite::database::iterator &	row,
		const std::string &	id_col,
		const std::string &	geom_col )

Build a feature from a GPKG table row.

Parameters

[in]	row	SQLite iterator at the row to build a feature from
[in]	geom_col	Name of geometry column containing GPKG WKB

Returns

geojson::Feature Feature containing geometry and properties from the given row

References build_geometry(), build_properties(), geojson::GeometryCollection, ngen::sqlite::database::iterator::get(), geojson::LineString, geojson::MultiLineString, geojson::MultiPoint, geojson::MultiPolygon, geojson::Point, and geojson::Polygon.

build_geometry()

geojson::geometry ngen::geopackage::build_geometry	(	const ngen::sqlite::database::iterator &	row,
		const std::string &	geom_col,
		std::vector< double > &	bounding_box )

Build a geometry object from GeoPackage WKB.

Parameters

[in]	row	SQLite iterator at the row containing a geometry column
[in]	geom_col	Name of geometry column containing GPKG WKB
[out]	bounding_box	Bounding box of the geometry to output

Returns

geojson::geometry GPKG WKB converted and projected to a boost geometry model

References utils::copy_from(), ngen::sqlite::database::iterator::get(), ngen::srs::epsg::get(), and ngen::srs::epsg::wgs84.

Referenced by build_feature().

build_properties()

geojson::PropertyMap ngen::geopackage::build_properties	(	const ngen::sqlite::database::iterator &	row,
		const std::string &	geom_col )

Build properties from GeoPackage table columns.

Parameters

[in]	row	SQLite iterator at the row containing the data columns
[in]	geom_col	Name of geometry column containing GPKG WKB to ignore

Returns

geojson::PropertyMap PropertyMap of properties from the given row

References ngen::sqlite::database::iterator::columns(), and ngen::sqlite::database::iterator::types().

Referenced by build_feature().

read()

std::shared_ptr< geojson::FeatureCollection > ngen::geopackage::read	(	const std::string &	gpkg_path,
		const std::string &	layer = "",
		const std::vector< std::string > &	ids = {} )

Build a feature collection from a GPKG layer.

Parameters

[in]	gpkg_path	Path to GPKG file
[in]	layer	Layer name within GPKG file to create a collection from
[in]	ids	optional subset of feature IDs to capture (if empty, the entire layer is converted)

Returns

std::shared_ptr<geojson::FeatureCollection>

throw_if_not_type()

void ngen::geopackage::throw_if_not_type	(	uint32_t	given,
		wkb_geom_t	expected )

Referenced by ngen::geopackage::wkb::read_multilinestring(), ngen::geopackage::wkb::read_multipoint(), and ngen::geopackage::wkb::read_multipolygon().