Struct MillerCylindricalProjection 

pub struct MillerCylindricalProjection { /* private fields */ }

Miller Cylindrical

The Miller cylindrical projection is a modified Mercator projection, proposed by Osborn Maitland Miller in 1942.

Classification: Neither conformal nor equal area cylindrical

Available forms: Forward and inverse spherical

Defined area: Global, but best used near the equator

Alias: mill

Domain: 2D

Input type: Geodetic coordinates

Output type: Projected coordinates

Projection String

+proj=mill

Required Parameters

• None

Optional Parameters

• +lon_0: Longitude of projection center. Defaults to 0.
• +R: Radius of the sphere.
• +x_0: False easting. Defaults to 0.
• +y_0: False northing. Defaults to 0.

Usage Example

Using Central meridian 90°W:

$ echo -100 35 | proj +proj=mill +lon_0=90w
-1113194.91      4061217.24

Mathematical Definition

Forward projection:

$$x = \lambda$$ $$y = 1.25 * \ln \left[ \tan \left(\frac{\pi}{4} + 0.4 * \phi \right) \right]$$

Inverse projection:

$$\lambda = x$$ $$\phi = 2.5 * ( \arctan \left[ e^{0.8 * y} \right] - \frac{\pi}{4} )$$

Further reading

• Wikipedia on Miller Cylindrical
• “New Equal-Area Map Projections for Noncircular Regions”, John P. Snyder, The American Cartographer, Vol 15, No. 4, October 1988, pp. 341-355.

Trait Implementations

impl Clone for MillerCylindricalProjection

fn clone(&self) -> MillerCylindricalProjection

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl CoordinateStep for MillerCylindricalProjection

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 MillerCylindricalProjection

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

Formats the value using the given formatter.

impl PartialEq for MillerCylindricalProjection

fn eq(&self, other: &MillerCylindricalProjection) -> 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 MillerCylindricalProjection

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 MillerCylindricalProjection