How to implement linear heatmap

[a0a7]

I'm looking to build something that takes GeoJSON input and creates a linear kind of heatmap, like the example below, using MapLibre.

I.e. the density of traces at a point defines the color at that point. But I truly have no idea how to do this--where do I begin? How can I individually style "segments" of the line? Any and all information/help at all would really mean a lot.
Thanks in advance!

[wipfli]

Maybe with deckgl https://deck.gl/examples/line-layer ?

[IvanSanchez]

Been working on something like that for a while - see https://mastodon.social/@IvanSanchez/109824286426044519 and https://gitlab.com/IvanSanchez/gleo/-/blob/master/browser-demos/74-ais-drag-drop-heatstroke.html and https://ivan.sanchezortega.es/2023-gleo-slides/slide-42.html . No connector to maplibre I'm afraid.

[HarelM]

Please don't start a new discussion when you already have a different one open.
See here:
#3813