Adds support for IAU codes.

Author: jlaura

CHANGELOG.md

@@ -5,15 +5,15 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
-
+### Changed
+- Definition for authority and code instead of a hard coded EPSG. The EPSG code field was maintained for backwards compatibility.
 ## [v1.1.0] - 2023-02-10
 
 ### Added
 
 - Added examples for Collections and Assets (in Items)
 
 ### Changed
-
 - `proj:epsg` is not required in Item properties anymore. `proj:epsg` is recommended now, but not required in any scope.
 - Updated the PROJJSON schema to v0.5
 

README.md

@@ -37,9 +37,9 @@ The fields in the table below can be used in these parts of STAC documents:
 
 | Field Name       | Type                     | Description |
 | ---------------- | ------------------------ | ----------- |
+| proj:epsg        | integer\|null   | [EPSG code](http://www.epsg-registry.org/) of the datasource; Maintained for backwards compatability. Please use `proj:authority` and `proj:code`. |
 | proj:code        | integer\|null   | **REQUIRED.** [EPSG code](http://www.epsg-registry.org/) or other code (e.g., [IAU](http://voparis-vespa-crs.obspm.fr:8080/web/2015.html)) of the datasource |
 | proj:authority   | string\|null    | The name of the authority that designated the proj:code of the datasource. Default: `epsg`. |
-| proj:epsg        | integer\|null   |  [EPSG code](http://www.epsg-registry.org/) of the datasource; Maintained for backwards compatability. Please use `proj:authority` and `proj:code`. |
 | proj:wkt2        | string\|null    | [WKT2](http://docs.opengeospatial.org/is/12-063r5/12-063r5.html) string representing the Coordinate Reference System (CRS) that the `proj:geometry` and `proj:bbox` fields represent |
 | proj:projjson    | [PROJJSON Object](https://proj.org/specifications/projjson.html)\|null | PROJJSON object representing the Coordinate Reference System (CRS) that the `proj:geometry` and `proj:bbox` fields represent |
 | proj:geometry    | [GeoJSON Geometry Object](https://tools.ietf.org/html/rfc7946#section-3.1) | Defines the footprint of this Item. |