Heat mapping and hot spot mapping are commonly confused.
Heat maps can be used as a reference to measure how close together certain points maybe. Heat colour increases by where the density is the highest, these layers are redrawn every time you zoom in/out.
Hot spot maps measure statistical confidence. These are a fixed so don’t alter if you zoom in and out, they represent actual known locations and activity, these may look like heat maps at a certain distance because they can show high concentrations of points, but zoom in and you can see more data and see a fixed point.
Within game it’s obvious they are using a heat map to indicate ‘generally’ where certain things may be, based I would presume on averages, built procedurally, eg height map / atmosphere/ chemistry density etc = more of x.
Fly into area and the map becomes meaningless and just means, statistically whatever it is is somewhere around here/there but your going to have to actually ‘explore’.
The SRV radar ought to then be used to ping a location, logically but I don’t engage with this game method so can’t confirm if it works as intended.
If these points are all known (by FD) and maybe hand placed then a hot spot map ought to be utilised.
To be honest this is a missed opportunity, we have probes which we shoot at stuff, to assess the probability of where certain stuff could be, in reality we do this with satellites and data harvesting (eg Census data, social media data, government/ public records), this then is viewed from a regional point, to zoom in and assess the street level, before resources are deployed.
FD are essentially skipping the middle section and letting player roam around looking for stuff, but in reality we could sit in orbit, choose a certain location and just look at thsurface with an enhanced scanner.
Likely this is just too complex for FD to undertake.
One could argue there’s no need to actually visit said system at all, as such a scan could be done with advanced optics from another system, no need to send a person, maybe a drone to collect samples.
In the early days of 1st Alpha FD did propose something of this scale, which if I recall included hyperspace way point mapping, but like many of its more cooler ideas, it was moth balled for the more hands on approach we have now.