Additional colormaps do not appear in colorMaps/* response

[anayeaye]

What

Titiler supports additional custom colormaps but the custom colormaps are not returned in the colorMaps endpoint to list available colormaps or the colorMaps/{colormapName} metadata endpoint.

For example, the nlcd colormap can be used to render tiles
https://openveda.cloud/api/raster/collections/nlcd-annual-conus/items/nlcd_2001_cog_v2/preview.png?bidx=1&assets=landcover&nodata=0&resampling=nearest&colormap_name=nlcd

But nlcd is not in the response for https://openveda.cloud/api/raster/colorMaps

AC

• colorMaps* endpoints return custom colormaps in addition to default colormaps

[anayeaye]

@vincentsarago do you think we need to make a change in veda-backend to return additional custom colormaps in the colorMaps response? And/or should we open a titiler issue?

[smohiudd]

The Colormaps factory that we're using only includes the default colormaps.

We need to somehow append the custom colormaps as well.

It looks like the other factories just reference the custom colormap dependency so maybe we can do the same with ColorMapFactory()

cog = TilerFactory(
    router_prefix="/cog",
    optional_headers=optional_headers,
    environment_dependency=settings.get_gdal_config,
    router=APIRouter(route_class=LoggerRouteHandler),
    extensions=[
        cogValidateExtension(),
        cogViewerExtension(),
    ],
    colormap_dependency=ColorMapParams,
)

[botanical]

Deployed changes to dev and confirmed that the colormap endpoint now returns the additional colormaps

curl -X 'GET' \
  'https://dev.openveda.cloud/api/raster/colorMaps' \
  -H 'accept: application/json'

{"colorMaps":["accent","accent_r","afmhot","afmhot_r","algae","algae_r","amp","amp_r","autumn","autumn_r","balance","balance_r","binary","binary_r","blues","blues_r","bone","bone_r","brbg","brbg_r","brg","brg_r","bugn","bugn_r","bupu","bupu_r","bwr","bwr_r","cfastie","cividis","cividis_r","cmrmap","cmrmap_r","cool","cool_r","coolwarm","coolwarm_r","copper","copper_r","cubehelix","cubehelix_r","curl","curl_r","dark2","dark2_r","deep","deep_r","delta","delta_r","dense","dense_r","diff","diff_r","flag","flag_r","gist_earth","gist_earth_r","gist_gray","gist_gray_r","gist_heat","gist_heat_r","gist_ncar","gist_ncar_r","gist_rainbow","gist_rainbow_r","gist_stern","gist_stern_r","gist_yarg","gist_yarg_r","gnbu","gnbu_r","gnuplot","gnuplot2","gnuplot2_r","gnuplot_r","gray","gray_r","greens","greens_r","greys","greys_r","haline","haline_r","hot","hot_r","hsv","hsv_r","ice","ice_r","inferno","inferno_r","jet","jet_r","magma","magma_r","matter","matter_r","nipy_spectral","nipy_spectral_r","ocean","ocean_r","oranges","oranges_r","orrd","orrd_r","oxy","oxy_r","paired","paired_r","pastel1","pastel1_r","pastel2","pastel2_r","phase","phase_r","pink","pink_r","piyg","piyg_r","plasma","plasma_r","prgn","prgn_r","prism","prism_r","pubu","pubu_r","pubugn","pubugn_r","puor","puor_r","purd","purd_r","purples","purples_r","rain","rain_r","rainbow","rainbow_r","rdbu","rdbu_r","rdgy","rdgy_r","rdpu","rdpu_r","rdylbu","rdylbu_r","rdylgn","rdylgn_r","reds","reds_r","rplumbo","schwarzwald","seismic","seismic_r","set1","set1_r","set2","set2_r","set3","set3_r","solar","solar_r","spectral","spectral_r","speed","speed_r","spring","spring_r","summer","summer_r","tab10","tab10_r","tab20","tab20_r","tab20b","tab20b_r","tab20c","tab20c_r","tarn","tarn_r","tempo","tempo_r","terrain","terrain_r","thermal","thermal_r","topo","topo_r","turbid","turbid_r","turbo","turbo_r","twilight","twilight_r","twilight_shifted","twilight_shifted_r","viridis","viridis_r","winter","winter_r","wistia","wistia_r","ylgn","ylgn_r","ylgnbu","ylgnbu_r","ylorbr","ylorbr_r","ylorrd","ylorrd_r","epa-ghgi-ch4","nlcd","soil_texture","surface_temperature","tornado_ef_scale"],"links":[{"href":"https://dev.openveda.cloud/api/raster/colorMaps","rel":"self","type":"application/json","title":"List of available colormaps"},{"href":"https://dev.openveda.cloud/api/raster/colorMaps/{colorMapId}","rel":"data","type":"application/json","templated":true,"title":"Retrieve colorMap metadata"},{"href":"https://dev.openveda.cloud/api/raster/colorMaps/{colorMapId}?format=png","rel":"data","type":"image/png","templated":true,"title":"Retrieve colorMap as image"}]}%

[anayeaye]

@botanical do you think there is a similar fix for the colorMap/<colormapId> endpoint? I haven't looked at the change that fixed the colormap list but I hope it will be something similar to support the colormap metadata/legend endpoint