How much information do these tiles contain anyway?
Would they be useful for eap/fsd at all?
I'm under impression, that you should not really look at those files as "maps" in classic meaning of this word, where map is telling us what is where and is an aid in navigation. I would rather call those files a road information database. The road curvature in real world coordinates is forming something more like an index in the database, in my opinion. Index used to find on which road you are driving on, to find the properties of it. So the properties attached to the spline are the key information the car wants, and the splines position and shape are there to allow to find which road is it (but that is only my opinion).
I wrote all I could figure out about the information attached to the splines in points in my
previous post. How those information are used is hard to tell. From Elon Musk explanation we know the use of radar false echoes list. Field 20 reminds me about the promised auto ramp-to-ramp functionality, but this was never released, so who knows. Its more like a guess, but I think that filed 5 is responsible for not drifting into exit lanes, that people called "learning of Autopilot" at early stages of AP1.
Is it enough for EAP/FSD? I don't know, but remember that Tesla can expand that list if needed and populate new field with required data. I'm pretty sure that it was historically expanded already, and the order of fields may be some hint about the order of features introduction.
Is this the actual speed limit data our cars get fed?
It would certainly explain my AP1 car's confusion!
This is the catch - I don't know. When looking at what values this field can take i was under impression, that this is a speed limit. I'm not sure about the actual purpose of this field. And I definitely don't know how the car is utilizing this field.
Right now you know more than me. When talking that this explains AP1 confusing, do you mean that the speed limit reported by the car is consistent with the map, or that there is even more mess?
Hey
@DamianXVI could you make it so, that the speed limits show up in the viewer? I.e. not just color codings, but some text that shows the actual speed limit? Or, if that would make the map too busy, maybe a static color map that shows what the colors mean?
Drawing features on the map is very simplistic, that's right. I didn't spent too much time on it. Drawing any values on top of the map can however be tricky. Before I had an interactive tool i tried to print some IDs on a surface of an image, and it resulted in one big mess, so now I'm not very convinced to try that again. It would require to detect that multiple splines forms a single road with same properties, and somehow prevent labels from obscuring each other. I don't know.
What is definitively missing is a legend. Every map should have a legend, like every chart needs to have its axes labeled. This is something that should be added. And the scale of colors used to label roads can be widened. Right now its just green-yellow-red. Wider scale would make it easier to distinguish different properties.
Question: How often are the tiles updated? Anyone care to screen grab and check another day for potential updates on «trust» or such?
I think you should rather check the tile hash, or something like that. The differences could bee too small, to notice them on the rendering.
