1. A method, comprising: identifying, by executing an instruction with a processor, first features of a first open market from a first image of a first geographic area; identifying, by executing an instruction with the processor, second features of a second image of a second geographic area; comparing the first features to the second features by executing an instruction with the processor; identifying, by executing an instruction with the processor, additional open markets in the second image based on the comparison; determining, by executing an instruction with the processor, first characteristics of the additional open markets based on the comparison of the first features to the second features and corresponding second characteristics of the first open market, the first characteristics including at least one of a) numbers of stores in the additional open markets, b) physical sizes of the additional open markets, c) whether the additional open markets are in previously enumerated areas or previously unenumerated areas, or d) trade areas of the additional open markets; modifying, by executing an instruction with the processor, a sampling area in the second geographic area to be physically sampled to include in the sampling area at least a subset of the additional open markets in the second geographic area based on the first characteristics; and providing the modified sampling area to a sampler for physical sampling of the second geographic area according to the modified sampling area to determine a number of stores in the second geographic area, the physical sampling including determining a retail characteristic of the modified sampling area.