Support inspecting the attributes of the preview layer

[thatbudakguy]

Lots to potentially do here. Vanilla GeoBlacklight's implementation (also used by BTAA) displays the features in a table below the viewer, which doesn't work since...all we have here is the viewer. Earthworks does it using a panel inside the viewer:

Can we improve on this UI? What about putting the inspection details as a panel inside our existing sidebar?

How can we offer a useful inspection preview for:

• Raster data
• Vector data
• Index maps

Relevant code in GeoBlacklight (although specific to leaflet) is inspection.js.

[thatbudakguy]

For WMS layers, GeoBlacklight does some fancy stuff by proxying the request through GBL itself, presumably so that you can hit restricted endpoints if you are authenticated to do so?

We can't always do that, but we can add something to enable it if the viewer happens to be on a GBL instance.

[thatbudakguy]

The MapLibre Show polygon information on click example has some useful code to steal for geoJSON/index map inspection.

[dnoneill]

@thatbudakguy I have a working prototype tied to WMS that hopefully will make whoever picks this ups life easier. I do think we should talk to Alan before proceeding. I think he had some thoughts on this.