Categorical color mapping #977
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pont-us
approved these changes
May 17, 2024
| `"#RRGGBBAA"`. | ||
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| The `type` values are | ||
| - `"node"`: control points are nodes of a continuous color gradient. |
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A "control point" is what was called a "control value" in the previous paragraph, right? If so I'd prefer to standardize on a single term.
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| cmap_norm: Color map normalisation. One of "lin" (linear), "log" | ||
| (logarithmic), "cat" (categorical). |
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I instinctively want to introduce an enum, but I guess it's not worth it when we need the string representation to interface with the viewer anyway...
| This service publishes its map layers via special URLs that | ||
| contain an image tile's x- and y-coordinates and an optional zoom level z. | ||
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| **WTS Layer URL**: The URL of layer offered by a TMS. It must contain |
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Suggested change
| **WTS Layer URL**: The URL of layer offered by a TMS. It must contain | |
| **WMTS Layer URL**: The URL of layer offered by a WMTS. It must contain |
Co-authored-by: Pontus Lurcock <pontus.lurcock@brockmann-consult.de>
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xcube server's tile API can now handle user-defined colormaps from xcube
viewer. Custom color bars are still passed using query parameter
cmaptoendpoint
/tiles/{datasetId}/{varName}/{z}/{y}/{x},but in the case of custom color bars it is a JSON-encoded object with the
following format:
{"name": <str>, "type": <str>, "colors": <list>}. (User-defined color bars #975)The object properties are
name: a unique name.type: optional type of control values.colors: a list of pairs[[<v1>,<c1>], [<v2>,<c2>], [<v3>,<c3>], ...]that map a control value to a hexadecimal color value using CSS format
"#RRGGBBAA".The
typevalues are"node": control points are nodes of a continuous color gradient."bound": control points form bounds that map to a color, which meansthe last color is unused.
"key": control points are keys (integers) that identify a color.xcube server's tile API now allows specifying the data normalisation step
before a color mapping is applied to the variable data to be visualized.
This affects endpoint
/tiles/{datasetId}/{varName}/{z}/{y}/{x}and the WMTSAPI. The possible normalisation values are
lin: linear mapping of data values betweenvminandvmaxto range 0 to 1(uses
matplotlib.colors.Normalize(vmin, vmax)).log: logarithmic mapping of data values betweenvminandvmaxto range 0 to 1(uses
matplotlib.colors.LogNorm(vmin, vmax)).cat: categorical mapping of data values into to indexes into the color mapping.(uses
matplotlib.colors.BoundaryNorm(categories)). This normalisationcurrently only works with user-defined colormaps of type
keyorbound(see above).The normalisation can be specified in three different ways (in order):
normpassed to the tile endpoint.Normin theStyles/ColorMappingelement in xcube server configuration.color_norm.The xcube viewer part of this PR is PR xcube-dev/xcube-viewer#338.
Checklist:
docs/source/*CHANGES.md