Crate proj4wkt

source ·
Expand description

WKT CRS parser

Convert WKT CRS to proj string

Support both WKT1 and WKT2 formats.

This is a companion crate for proj4rs because of this conversions are limited to projection supported by proj4rs. As more projection will be supported in proj4rs, more conversions will be supported in proj4wt.

This crate may be built as WASM package

Example:

use proj4wkt::wkt_to_projstring;

const nad83: &str = concat!(
   r#"PROJCS["NAD83 / Massachusetts Mainland",GEOGCS["NAD83","#,
   r#"DATUM["North_American_Datum_1983",SPHEROID["GRS 1980",6378137,298.257222101,"#,
   r#"AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","6269"]],PRIMEM["Greenwich",0,"#,
   r#"AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,"#,
   r#"AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4269"]],UNIT["metre",1,"#,
   r#"AUTHORITY["EPSG","9001"]],PROJECTION["Lambert_Conformal_Conic_2SP"],"#,
   r#"PARAMETER["standard_parallel_1",42.68333333333333],"#,
   r#"PARAMETER["standard_parallel_2",41.71666666666667],"#,
   r#"PARAMETER["latitude_of_origin", -41],PARAMETER["central_meridian",-71.5],"#,
   r#"PARAMETER["false_easting",200000],PARAMETER["false_northing",750000],"#,
   r#"AUTHORITY["EPSG","26986"],AXIS["X",EAST],AXIS["Y",NORTH]]"#,
);

let projstr = wkt_to_projstring(nad83).unwrap();
assert_eq!(
    projstr,
    concat!(
        "+proj=lcc +lat_1=42.68333333333333 +lat_2=41.71666666666667",
        " +lat_0=-41 +lon_0=-71.5 +x_0=200000 +y_0=750000 +units=m +a=6378137",
        " +rf=298.257222101 +towgs84=0,0,0,0,0,0,0",
    )
);

Modules

  • parser
    Generic, grammar free WKT parser implementation

Structs

Functions