OWS Configuration - Hybrid Styles

Hybrid Styles

Hybrid styles are an experimental type of style that return a linear combination of a component style and a colour ramp style.

This can allow for a more easily visually interpreted image, but there are usually better ways to achieve the same effect on the client side.

Hybrid styles support most [*] elements supported by either component styles or colour ramp styles and define two independent styles (one of each type) that are then blended according to the required component_ratio entry.

If component_ratio should be a float between 0.0 and 1.0. A value of ‘0.0’ means 100% colour ramp style, ‘1.0’ means 100% component style and a value of ‘0.5’ means a 50/50 blend of the two, etc.

[*]

Hybrid Styles do NOT support auto-legend generation. All other features of component and colour-ramp styles are supported.

E.g.:

"legend": {
    # Common stuff
    "name": "rgb_ndvi",
    "title": "NDVI plus RGB",
    "abstract": "NDVI combined with RGB for terrain detail",

    # Component Style
    "components": {
        "red": {
            "red": 1.0
        },
        "green": {
            "green": 1.0
        },
        "blue": {
            "blue": 1.0
        }
    },
    "scale_range": [0.0, 3000.0]

    # Colour-Ramp Style
    "index_function": {
        "function": "datacube_ows.band_utils.norm_diff",
        "pass_product_cfg": True,
        "kwargs": {
            "band1": "nir",
            "band2": "red"
        }
    },
    "range": [0.0, 1.0],
    "mpl_ramp": "RdBu",

    #  Does not need to include "green" and "blue".
    # (But no harm in adding them explicitly either.)
    "needed_bands": ["red", "nir"],

    # Blend 60% RGB + 40% ndvi
    "component_ration": 0.6,
}