Skip to content

Add Zarr Geo Projection Attribute Extension specifications and schema #39

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 6 commits into from
Sep 29, 2025
Merged

Add Zarr Geo Projection Attribute Extension specifications and schema #39

Show file tree
Hide file tree
Changes from 1 commit
Commits
Show all changes
6 commits
Select commit Hold shift + click to select a range
b11e078
Add Zarr Geo Projection Attribute Extension specifications and schema
emmanuelmathot Sep 28, 2025
765f305
Update attributes/README.md
emmanuelmathot Sep 28, 2025
9d7a9ba
Update attributes/README.md
emmanuelmathot Sep 28, 2025
fa8fcbd
Update attributes/geo/proj/README.md
emmanuelmathot Sep 28, 2025
1c3aec6
Add implementation requirement to attribute specifications and enhanc…
emmanuelmathot Sep 29, 2025
812cf83
Remove status and registry entry from Geo Projection Attribute Extens…
emmanuelmathot Sep 29, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
37 changes: 37 additions & 0 deletions attributes/README.md
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,37 @@
# Zarr Attributes Specifications

This directory contains detailed specifications for Zarr attribute extensions that are registered in the [zarr-extensions repository](https://github.com/zarr-developers/zarr-extensions).

## Overview

Zarr attributes are metadata stored in the `attributes` dictionary of Zarr arrays and groups. While the `attributes` dictionary can contain arbitrary metadata, this directory provides specifications for commonly used attribute conventions within the Zarr community.

## Registered Attributes

### [`geo/proj`](./geo/proj/README.md) - Geo Projection Attribute Extension

**Status**: Proposed
**Registry Entry**: [zarr-extensions/attributes/geo/proj](https://github.com/zarr-developers/zarr-extensions/tree/main/attributes/geo/proj)

Defines a JSON object that encodes datum and coordinate reference system (CRS) information for geospatial data stored under the `proj` key within the `geo` dictionary.

**Key Features**:
- Simple, standardized CRS encoding without complex nested structures
- Compatible with existing geospatial tools (GDAL, rasterio, pyproj)
- Based on the proven STAC Projection Extension model
- Group-to-array inheritance model for CRS metadata
- Support for multiple CRS representations (EPSG codes, WKT2, PROJJSON)

**Specification**: [./geo/proj/README.md](./geo/proj/README.md)

## Contributing

For changes to attribute specifications:

1. **Content Changes**: Submit PRs to this repository for specification content
2. **Registration Changes**: Submit PRs to [zarr-extensions](https://github.com/zarr-developers/zarr-extensions) for registry updates
3. **New Attributes**: Follow the [registration process](https://github.com/zarr-developers/zarr-extensions#registering-an-attribute) in zarr-extensions

## License

All attribute specifications are licensed under the [Creative Commons Attribution 3.0 Unported License](https://creativecommons.org/licenses/by/3.0/), consistent with the zarr-extensions registry.
Loading