Sort of progressbar

I cannot figure out how to make the following.

I have a picture of a cycling route like in the Tour de France. The picture of the stage is in 2d. I want to make a progress bar eg. coloring the mountain green as the riders progress. My problem is how to only color some part of the stage cause the stage has peaks, hope this makes sense

Something like this in the end of the video

Ono 100% sure the best practice for this but I’m sure you can achieve this fx by making a duplicate layer of the mountain ridge position of top if the original… With a start animation of a gradient that’s your green of choice with an alpha of zero then animate that gradient to have the green opacity end at full for the last key frame…

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