I search out where different types of trees/brush/cover meet. For example where oaks meet pines meet cedar meet brush. The more types the better! Deer are browsers and follow edges. The more types of edges the better. Years ago I bought and used color infrared aerial photos. Each type of tree/brush/cover will be a different color. Now a days I use google earth and historicaerials.com to find my spots. Good Luck!