Add custom colormap for soil texture collections

[anayeaye]

What

Some categorical data require complex colormap definitions that exceed the allowed URL length in MCP. We can create a custom colormap for this collection, see the instructions here.

renders

"renders": {
    "dashboard": {
        "resampling": "nearest",
        "nodata": 255,
        "colormap": {
            "1": "#F89E61", 
            "2": "#BA8560", 
            "3": "#D8D2B4", 
            "4": "#AE734C", 
            "5": "#9E8478", 
            "6": "#C6A365",
            "7": "#B4A67D", 
            "8": "#E1D4C4", 
            "9": "#BEB56D", 
            "10": "#777C7A", 
            "11": "#A89B6F", 
            "12": "#E9E2AF"
        },
        "bidx": [
            1
        ],
        "return_mask": true,
        "assets": [
            "soil_texture_0cm_250m"
        ],
        "title": "VEDA Dashboard Render Parameters"
    }
}

Working preview in environment without WAF https://staging.openveda.cloud/api/raster/cog/preview.png?url=s3%3A%2F%2Fveda-data-store-staging%2Fsoil%2Fsoil_texture_60cm_250m_cog_2017.tif&nodata=255&colormap=%7B%221%22%3A+%22%23F89E61%22%2C+%222%22%3A+%22%23BA8560%22%2C+%223%22%3A+%22%23D8D2B4%22%2C+%224%22%3A+%22%23AE734C%22%2C+%225%22%3A+%22%239E8478%22%2C+%226%22%3A+%22%23C6A365%22%2C+%227%22%3A+%22%23B4A67D%22%2C+%228%22%3A+%22%23E1D4C4%22%2C+%229%22%3A+%22%23BEB56D%22%2C+%2210%22%3A+%22%23777C7A%22%2C+%2211%22%3A+%22%23A89B6F%22%2C+%2212%22%3A+%22%23E9E2AF%22%7D

AC

• [ ] Check for a published/standardized ISRIC soil texture colormap before generating the custom colormap defined above https://www.isric.org/search/node?keys=texture
• [ ] Custom soil texture colormap supported by titiler and new url accessible behind MCP WAF