Good question. When you reveal a location that is not Unique you roll for the level. You only need to roll once for a Reveal with the level applying to all placed location on the map for that Reveal.
On page 28 the first box shows you the d6 result and the level that corresponds to the result. A 1-2 on the d6 is level 1, a 3 to 5 is level 2, and 6 is level 3.
The second box shows static levels for certain locations. Deserts are always level 3, Unique level 2, Non-Traversable level 3, and Settlements level 2.
If I reveal a location - Crashed Spaceship [1] (4d) - which is an Ace of a black suit, I roll 1d6 for the level. I get a result of 4, which is level 2. I record a single cell on the map in the location I chose to Explore as the Crashed Spaceship is only 1 cell (indicated by the number in the square brackets). I must also record the 4 Deserts (indicated by the 4d in the circle brackets). These are all level 3 per the information given in the second box on page 28.
Thank you for the example.
If I reveal the Desert Lighthouse, it says in the table on page 26 that's a Unique Location. The first table on page 28 says I roll for its level, the second table says it's static at 2. Which one is it? Do I roll for it or is it static? If I roll for it, why does it appear in the second table at all? Same issue for settlements and non-traversable. That's what confuses me.