Let's get the bad news out of the way first. There is little about this book that justifies calling it a "Digital Edition." A preliminary section on "Photography Essentials" provides a cursory description of digital point-and-shoot cameras vs. digital SLRs, and there's a reminder to check your histogram. That's about it for digital.
On the other hand, there are numerous references to film in the discussions of the parks (eg., on p. 62, "Fine-grained, saturated films such as Fujichrome Velvia will produce the highest quality results..."). Not exactly what a digital shooter wants to know. It appears that the park descriptions may have been taken from an earlier edition without editing out references to film and incorporating tips for digital photographers. If that's the case, shame on all involved for such laziness.
Now for the good news. If you are interested in learning the best places to photograph in the 21 national parks featured, this is a fine place to start. Even if you're just trying to decide which parks to visit without photographic ambitions, the excellent photos in this book will help you decide. Or maybe not -- they all look enticing in Fitzharris's images.
Each park is given 6-8 pages with several photography "hot spots" described and located on small maps. The author also tells you which season is best for a visit and the best time of day to shoot at the various locations. In the case of several parks, "excursions" are described to other photographic locations in the region. For example, Bryce Canyon is briefly described as an excursion in the section on Zion National Park. Those who have been to Bryce might argue it merits its own section, but this book is not trying for inclusiveness.
In short, this book is fine as a guide to photo locations in the parks included, but falls rather short in the digital department.