WkbDecoder class

Decodes GeoPackage WKB (GPKG-WKB) geometries into flat Float32List coordinates.

GeoPackage stores geometries in GeoPackage Binary Format which wraps ISO WKB with a header containing magic bytes, flags, SRS ID, and optional envelope. This class strips the GPKG header and parses the ISO WKB payload.

Constructors

WkbDecoder()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

decode(Uint8List gpkgWkb) → Float32List?

Decode a GPKG-WKB blob into flat x1,y1, x2,y2, ... coordinates.

decodeAsRecord(Uint8List gpkgWkb) → Record?

Decode any geometry type and return the appropriate Record subclass

decodePoint(Uint8List gpkgWkb) → Point?

Decode a GPKG-WKB blob as a Point geometry

decodePolygon(Uint8List gpkgWkb) → Polygon?

Decode a GPKG-WKB blob as a Polygon geometry

decodePolyline(Uint8List gpkgWkb) → Polyline?

Decode a GPKG-WKB blob as a Polyline geometry

extractEnvelope(Uint8List gpkgWkb) → ({double maxX, double maxY, double minX, double minY})?

Extract the GPKG envelope from a GPKG-WKB blob.

upgradeEnvelope(Uint8List gpkgWkb) → Uint8List?

Rewrite a GPKG-WKB blob to embed an XY envelope in the header.