This is a trend map, my version anyway. Future trends are developing right in front of our faces. I think observation is the best skill for seeing future trends. The trend map gives you a place to put those observations and start to pull some consistent themes out. This can be used for macro views (full market or society) or micro (small niche or individual product).
The art of trend mapping is the observation, what you notice. I enjoy drilling down into the drives and needs that make people notice and item and desire it. Use of multiple types of maps and data is the way to see existing and deveolping trends.