Struct Datum 

pub struct Datum { /* private fields */ }

A geodetic datum, defined by a reference ellipsoid and its relationship to WGS84.

Implementations

impl Datum

pub fn new(ellipsoid: Ellipsoid, to_wgs84: DatumToWgs84) -> Result<Self>

Create a datum from an ellipsoid and an explicit path to WGS84.

pub fn with_epsg(self, epsg: u32) -> Self

Attach the EPSG geodetic datum code this definition corresponds to.

pub const fn epsg(&self) -> u32

EPSG geodetic datum code, or 0 when unspecified/custom.

pub const fn ellipsoid(&self) -> Ellipsoid

Return the reference ellipsoid.

pub const fn to_wgs84(&self) -> &DatumToWgs84

Return the explicit relationship from this datum to WGS84.

pub fn is_wgs84_compatible(&self) -> bool

Returns true if this datum is WGS84 or functionally identical (no Helmert shift needed).

pub fn has_known_wgs84_transform(&self) -> bool

Returns true if this datum has a known path to WGS84.

pub fn uses_grid_shift(&self) -> bool

Returns true if this datum’s WGS84 path uses one or more horizontal grids.

pub fn helmert_to_wgs84(&self) -> Option<&HelmertParams>

Return the Helmert parameters for this datum’s path to WGS84, when available.

pub fn same_datum(&self, other: &Datum) -> bool

Returns true if two datums are the same.

WGS84-compatible (Identity) datums form an equivalence class regardless of code. Otherwise, when both sides carry an EPSG datum code, code equality decides. Code-less (custom) datums fall back to structural comparison, where two Unknown datums are never equal — fail-closed for operation selection.

Trait Implementations

impl Clone for Datum

fn clone(&self) -> Datum

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Datum

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.