PROJ

Rust bindings for PROJ.4, v5.2.x

Examples

Note that as of v5.0.0, PROJ.4 uses the pipeline operator, which allows an arbitrary number of steps in a conversion. The first example below works as follows:

• define the operation as a pipeline operation
• define step 1 as an inverse transform, yielding geodetic coordinates
• define step 2 as a forward transform to projected coordinates, yielding metres.

Convert from NAD 83 US Survey Feet to NAD 83 Meters

extern crate proj;
use proj::Proj;

extern crate geo_types;
use geo_types::Point;

let nad_ft_to_m = Proj::new("
    +proj=pipeline
    +step +inv +proj=lcc +lat_1=33.88333333333333
    +lat_2=32.78333333333333 +lat_0=32.16666666666666
    +lon_0=-116.25 +x_0=2000000.0001016 +y_0=500000.0001016001 +ellps=GRS80
    +towgs84=0,0,0,0,0,0,0 +units=us-ft +no_defs
    +step +proj=lcc +lat_1=33.88333333333333 +lat_2=32.78333333333333 +lat_0=32.16666666666666
    +lon_0=-116.25 +x_0=2000000 +y_0=500000
    +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs
").unwrap();
// The Presidio, approximately
let result = nad_ft_to_m.convert(Point::new(4760096.421921, 3744293.729449)).unwrap();
assert_eq!(result.x(), 1450880.29);
assert_eq!(result.y(), 1141263.01);

Inverse Projection from Stereo70 to Geodetic

extern crate proj;
use proj::Proj;

extern crate geo_types;
use geo_types::Point;

// Carry out an inverse projection from Pulkovo 1942(58) / Stereo70 (EPSG 3844) into geodetic lon and lat coordinates (in radians)
let stereo70 = Proj::new(
    "+proj=sterea +lat_0=46 +lon_0=25 +k=0.99975 +x_0=500000 +y_0=500000 +ellps=krass +towgs84=33.4,-146.6,-76.3,-0.359,-0.053,0.844,-0.84 +units=m +no_defs"
    ).unwrap();
let rp = stereo70.project(Point::new(500119.70352012233, 500027.77896348457), true).unwrap();
assert_eq!(rp, Point::new(0.436332, 0.802851));

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.