Étendue

Open data for astrophotography.

Catalogs, annotation, metadata, and publishing tools for people who would rather understand the sky than fight the software.

What is Étendue?

Étendue is an open framework for astronomical catalogs, annotation, metadata, and publishing. Rather than a single application, it is a collection of interoperable projects built around a common data model. Each component can stand alone while sharing the same underlying information.

Principles

Open

Favor open formats, documented schemas, and permissive licensing whenever practical.

Accurate

Generate catalogs from authoritative sources with transparent provenance rather than maintaining them manually.

Composable

Small tools should work independently while becoming more powerful together.

Projects

Catalogs

Modern astronomical catalogs generated from public data for annotation, analysis, and publication.

Annotation

Fast browser-based rendering with WCS support and extensible annotation layers.

Metadata

A common schema describing astronomical images, observations, equipment, and derived products.

Publishing

Static websites, APIs, galleries, and exports built from the same underlying metadata.

In Progress