Add custom GDAL color table support for COG layers via TiTiler#1017
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jdrodjpl wants to merge 5 commits into
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Add custom GDAL color table support for COG layers via TiTiler#1017jdrodjpl wants to merge 5 commits into
jdrodjpl wants to merge 5 commits into
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✅ Version Already UpdatedThis PR includes a manual version update to No automatic version bump needed. |
tariqksoliman
requested changes
Jul 20, 2026
Adds a cogColormapJson layer config field ("Custom Color Table (GDAL)",
in its own section of the COG tab) that is passed through to TiTiler's
`colormap` query parameter. Accepts either a discrete value-to-RGBA map
(e.g. {"1":[10,40,85,255]}) or a list of [[min,max],RGBA] intervals,
letting classified rasters (land cover, sea-ice type, etc.) be colored
by raw pixel value.
Behavior:
- The color table supersedes the named Colormap (colormap_name), and
the Colormap dropdown disables itself with an explanatory tooltip
when both a color table and the COG transform are set (via a new
generic `disableWhen` hook in the configure app's Maker)
- rescale is suppressed when a color table is set: TiTiler applies
rescale before the colormap lookup, which would remap raw values
away from the table's keys
- A discrete legend (one labeled color chip per class or interval,
suffixed with cogUnits) is generated automatically through the
LegendTool/populateCogScale path, with or without the COG transform
enabled; fully transparent entries (e.g. nodata) are skipped
- The layer settings panel renders the color table as a swatch strip
in place of the named-colormap preview image
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tariqksoliman
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LGTM! Feel free to merge.
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Oh, one thing I forgot: If possible can you add a layer to the Reference-Mission blueprint showing off this feature, |
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Adds a cogColormapJson layer config field ("Custom Color Table (GDAL)", in its own section of the COG tab) that is passed through to TiTiler's
colormapquery parameter. Accepts either a discrete value-to-RGBA map (e.g. {"1":[10,40,85,255]}) or a list of [[min,max],RGBA] intervals, letting classified rasters (land cover, sea-ice type, etc.) be colored by raw pixel value.Behavior:
disableWhenhook in the configure app's Maker)