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Clarify 'nodata' behavior #26

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Merged
emmanuelmathot merged 2 commits into from
Sep 22, 2026
Merged

Clarify 'nodata' behavior #26

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Clarify 'nodata' behavior in README and CHANGELOG to specify it overr…
emmanuelmathot Sep 22, 2026
0e3ca14
Merge branch 'main' into fix/issue-15-nodata-clarification
emmanuelmathot Sep 22, 2026
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2 changes: 2 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
### Fixed

- Document that `expression` accepts `string`, `object`, or `array`, matching the schema ([#8](https://github.com/stac-extensions/render/issues/8))
- Clarify that `nodata` overrides any nodata value already defined on the referenced assets for this specific
render, rather than duplicating it ([#15](https://github.com/stac-extensions/render/issues/15))
- Update broken titiler `colormap`/`color_formula` doc links and replace the dead `api.cogeo.xyz` demo host.
Rework the NDVI example around the still-live Sentinel-2 item, since the Landsat-8 example's source imagery
was removed from the public `landsat-pds` bucket ([#13](https://github.com/stac-extensions/render/issues/13))
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2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -39,7 +39,7 @@ The fields in the table below can be used in these parts of STAC documents:
| assets | \[string] | **REQUIRED**. Array of asset keys [referencing the assets](#assets-reference) that are used to make the rendering |
| title | string | Optional title of the rendering |
| rescale | \[float] | 2 dimensions array of delimited Min,Max range per band. If not provided, the data will not be rescaled. |
| nodata | float, string | Nodata value to use for the referenced assets. |
| nodata | float, string | Nodata value to use for this render, overriding any nodata value already defined on the referenced assets (e.g. via the [raster](https://github.com/stac-extensions/raster) extension). If not set, implementations SHOULD fall back to the asset's own nodata value. |
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| colormap_name | string | Color map identifier that must be applied for a raster band |
| colormap | object | [Color map JSON definition](https://developmentseed.org/titiler/user_guide/rendering/#custom-colormaps) that must be applied for a raster band |
| color_formula | string | [Color formula](https://developmentseed.org/titiler/user_guide/rendering/#color-formula) that must be applied for a raster band |
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