Feature request: legend visualization for WMS raster data

[antobenve]

Expected Behavior

When loading a dataset through WMS request, it would be useful to understand what colors refer to in terms of numbers.

Current Behavior

Colors are difficult to understand as even the range of data is not known.

Possible Solution

The visualization of a legend would be enough if data cannot be accessed and therefore information cannot be obtained by clicking on the map (through the pop-up window).

Steps to Reproduce

1. Load a WMS view according to this code:
   https://sedac.ciesin.columbia.edu/geoserver/wms?bbox={bbox-epsg-3857}&service=WMS&version=1.1.1&request=GetMap&srs=EPSG:3857&style=&layers= gpw-v4:gpw-v4-population-count-adjusted-to-2015-unwpp-country-totals_2020&format=image/png8&transparent=true&height=256&width=256
2. Check its visualization

...

[fxi]

Done: