TB AVN 1-2130SP...but it's an Army pub dated 2001.
View attachment 24931
Ding ding ding. The intent of having the cross-hatches is to indicate a high or low altitude procedure. But there's a caveat...
I understand high and low approaches. I don’t understand high and low SIDs.
Exactly. What is a low or high (or lo/hi) SID? If you think that a high altitude instrument approach starts in the high enroute structure, then it's plausible that a SID that ends in the low or high enroute structure is therefore a low or high altitude procedure. For foreign procedures, the cross-hatching indicates this.
However, in the US...
A high altitude approach design does not have starting altitude (or enroute structure) criteria. Rather, it has descent gradient criteria (i.e., penetration descent). NAS Corpus Christi has examples of
high procedures that start in the low enroute structure. Furthermore, FAA SIDs may end in the high enroute structure but they don't have cross-hatches. So what's the point? For CONUS, the half cross-hatching is to indicate that the procedure can be found in both a low altitude book and a high altitude book.
So there you have it... different answers for different parts of the world. With that said, do you find the SID cross-hatching valuable at all?