A three dimensional diagram of the High Ground level, although this appears to be an early version. The VIDOC refers to an initial design that featured a fortified wall perpendicular to the valley, as well as multiple automated turrets. In the final design, the wall is turned 45 degrees, and there is only a single turret.
This diagram also mentions features which may not be present, such as "blow-upable gate", as compared to the gates in Halo 2 levels like Zanzibar, which can only be opened by pressing a button inside the structure, and "big ass mortar gun" which may (or may not) be just a joke.
Below the mortar gun an area is labelled "warthog dropoff" presumably for the defenders' warthog, or perhaps where it is assumed attackers will park a warthog while they wait for compatriots to throw the flag down from the raised platform just to the right.