Constructing area frames (AF) using satellite imagery, topographic maps, and aerial photos. Adaptation of existing digital materials for the purposes of the AF is another option.
Constructing list frames and implementing multiple frame sampling (MFS). During this stage the survey timing and the sample approach for the list frames are defined.
Calculating sample allocation and sample selection using optimum design. This system works in principle as a nested analysis of variance. The design is based on probability sampling and it is robust enough to allow for optimal sample allocation, emphasizing cost reduction and control of non-sampling errors.