Struct GnomonicProjection 

pub struct GnomonicProjection { /* private fields */ }

Gnomonic (gnom)

For a sphere, the gnomonic projection is a projection from the center of the sphere onto a plane tangent to the center point of the projection. This projects great circles to straight lines. For an ellipsoid, it is the limit of a doubly azimuthal projection, a projection where the azimuths from 2 points are preserved, as the two points merge into the center point. In this case, geodesics project to approximately straight lines (these are exactly straight if the geodesic includes the center point). For details, see Section 8 of :cite:Karney2013.

Classification: Azimuthal

Available forms: Forward and inverse, spherical and ellipsoidal

Defined area: Within a quarter circumference of the center point

Alias: gnom

Domain: 2D

Input type: Geodetic coordinates

Output type: Projected coordinates

Projection String

+proj=gnom +lat_0=90 +lon_0=-50 +R=6.4e6

Required Parameters

• None, all parameters are optional for this projection.

Optional Parameters

• +lon_0: Longitude of origin (central meridian).
• +lat_0: Latitude of origin.
• +x_0: False easting.
• +y_0: False northing.
• +ellps: Ellipsoid.
• +R: Earth radius.

Reference: Wolfram Mathworld “Gnomonic Projection” http://mathworld.wolfram.com/GnomonicProjection.html Accessed: 12th November 2009

Trait Implementations

impl Clone for GnomonicProjection

fn clone(&self) -> GnomonicProjection

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl CoordinateStep for GnomonicProjection

fn new(proj: Rc<RefCell<Proj>>) -> Self

Create a new Converter

fn forward<P: TransformCoordinates>(&self, p: &mut P)

forward conversion

fn inverse<P: TransformCoordinates>(&self, p: &mut P)

inverse conversion

impl Debug for GnomonicProjection

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

Formats the value using the given formatter.

impl PartialEq for GnomonicProjection

fn eq(&self, other: &GnomonicProjection) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl ProjectCoordinates for GnomonicProjection

fn code(&self) -> i64

ESPG code for this projection

fn name(&self) -> &'static str

Projection name

fn names() -> &'static [&'static str]

Returns the list of canonical names for this projection. This is an associated function, similar to a static method.

fn datum_type() -> u8

get the datum type. Defaults to no datum

impl StructuralPartialEq for GnomonicProjection