I'm not liking the heat map. The colors are too similar to each other, and they are affected by the underlying terrain, making them unclear. Plus, you can only see them from supercruise or orbital cruise, once you actually get down to the planet they disappear.
The colors need to be changed, and it should be an actual overlay, not semi-transparent. And you should be able to see it (and switch the filters) at any time after you've done the DSS.
I was at a planet that had 2 geological signals. The heat map looked like one big sheet of pale green, with black spots that turned out to be mountains poking thru. There was no way to use that to find anything. I sailed around for some time in the green areas, but found nothing. It was like going back in time to when we didn't have POIs and had to scan using the MKI eyeball.
I like the concept, but the implementation is terrible.
That's not the way to do it. Volcanic sites appear everywhere in the marked areas, the darker the areas the more concentrated, and you only need to go up to around 25-30klms to use the heatmap. You launch your ship, climb until you reach the point where you start accelerating from 2.5kps, set throttle to zero and change angle of climb to around 7%, activate surface scanner and you can then change and view the heatmap.
That's how I did it for these:
You target the darkest colour patch to get a higher concentration of vulcanism, you land, yes land, get in the SRV and drive away from the ship, check the SRV radar for lines, you will see them pretty quicly, drive towards them for a few hundred meters and there they are. It makes way more sense than just having a marker in a few dozen places scattered widely across the planet. In fact comparing the land forms to the heatmap clearly show certain coloured areas on the surface have a higher concentration of geo. I really like this new system, it gives you what you need without handing you everything on a platter, people have had it to easy for to long.
The major problem at the moment seems to be mat distribution among the vulcanism, this site no matter what I targetted only dropped carbon which is obviously not correct.