Struct Crs 

pub struct Crs { /* private fields */ }

A coordinate reference system the reprojection functions transform between.

Thin newtype over proj4rs::Proj; construct it from a proj4 string (Crs::from_proj_string), an EPSG code (Crs::from_epsg), or a WKT definition (Crs::from_wkt).

Implementations

impl Crs

pub fn from_proj_string(s: &str) -> Result<Self, CrsError>

Build a CRS from a proj4 definition string, e.g. "+proj=utm +zone=32 +datum=WGS84".

Errors

CrsError::Proj if proj4rs rejects the string.

Examples

use geometry_proj::Crs;
let wgs84 = Crs::from_proj_string("+proj=longlat +datum=WGS84 +no_defs").unwrap();

pub fn from_epsg(code: u16) -> Result<Self, CrsError>

Build a CRS from an EPSG code, e.g. 4326 (WGS84 lon/lat) or 3857 (Web Mercator).

Errors

CrsError::Proj if the code is unknown to proj4rs.

Examples

use geometry_proj::Crs;
let web_mercator = Crs::from_epsg(3857).unwrap();

pub fn from_wkt(wkt: &str) -> Result<Self, CrsError>

Build a CRS from a WKT definition, parsed to a proj string by proj4wkt.

Errors

CrsError::Wkt if the WKT cannot be parsed, or CrsError::Proj if the resulting proj string is invalid.

pub fn is_geographic(&self) -> bool

Whether this CRS is geographic (lon/lat), whose coordinates are carried in radians by proj4rs.