namespace FlatGeobuf;

// Geometry type enumeration

// NOTE: Same as WKB 2D geometry type enumeration

enum GeometryType: ubyte {

Unknown = 0,

Point = 1,

LineString = 2,

Polygon = 3,

MultiPoint = 4,

MultiLineString = 5,

MultiPolygon = 6,

GeometryCollection = 7,

CircularString = 8,

CompoundCurve = 9,

CurvePolygon = 10,

MultiCurve = 11,

MultiSurface = 12,

Curve = 13,

Surface = 14,

PolyhedralSurface = 15,

TIN = 16,

Triangle = 17

}

enum ColumnType: ubyte {

Byte, // Signed 8-bit integer

UByte, // Unsigned 8-bit integer

Bool, // Boolean

Short, // Signed 16-bit integer

UShort, // Unsigned 16-bit integer

Int, // Signed 32-bit integer

UInt, // Unsigned 32-bit integer

Long, // Signed 64-bit integer

ULong, // Unsigned 64-bit integer

Float, // Single precision floating point number

Double, // Double precision floating point number

String, // UTF8 string

Json, // General JSON type intended to be application specific

DateTime, // ISO 8601 date time

Binary // General binary type intended to be application specific

}

table Column {

name: string (required); // Column name

type: ColumnType; // Column type

title: string; // Column title

description: string; // Column description (intended for free form long text)

width: int = -1; // Column values expected width (-1 = unknown) (currently only used to indicate the number of characters in strings)

precision: int = -1; // Column values expected precision (-1 = unknown) as defined by SQL

scale: int = -1; // Column values expected scale (-1 = unknown) as defined by SQL

nullable: bool = true; // Column values expected nullability

unique: bool = false; // Column values expected uniqueness

primary_key: bool = false; // Indicates this column has been (part of) a primary key

metadata: string; // Column metadata (intended to be application specific and suggested to be structured fx. JSON)

}

table Crs {

org: string; // Case-insensitive name of the defining organization e.g. EPSG or epsg (NULL = EPSG)

code: int; // Numeric ID of the Spatial Reference System assigned by the organization (0 = unknown)

name: string; // Human readable name of this SRS

description: string; // Human readable description of this SRS

wkt: string; // Well-known Text Representation of the Spatial Reference System

code_string: string; // Text ID of the Spatial Reference System assigned by the organization in the (rare) case when it is not an integer and thus cannot be set into code

}

table Header {

name: string; // Dataset name

envelope: [double]; // Bounds

geometry_type: GeometryType; // Geometry type (should be set to Unknown if per feature geometry type)

has_z: bool = false; // Does geometry have Z dimension?

has_m: bool = false; // Does geometry have M dimension?

has_t: bool = false; // Does geometry have T dimension?

has_tm: bool = false; // Does geometry have TM dimension?

columns: [Column]; // Attribute columns schema (can be omitted if per feature schema)

features_count: ulong; // Number of features in the dataset (0 = unknown)

index_node_size: ushort = 16; // Index node size (0 = no index)

crs: Crs; // Spatial Reference System

title: string; // Dataset title

description: string; // Dataset description (intended for free form long text)

metadata: string; // Dataset metadata (intended to be application specific and suggested to be structured fx. JSON)

}

root_type Header;