A customer can be present in the display zone, appearing on the heatmap as active traffic, and yet not perceive the assortment. Their movement might be transitional, with their gaze directed at navigation, a shopping list, or the next department. From the perspective of such visualisation, all these scenarios look identical, though from a sales standpoint, the difference is fundamental.
Another limitation relates to the lack of information regarding the display structure. A heatmap does not know at which level products are located, how they are grouped, whether planogram rules are respected, or how consistently they are followed across different shops. It records neither the placement order of SKUs nor changes made on-site. As a result, movement data exists separately from the actual state of the shelf.
It is also important that a heatmap does not allow for the evaluation of repeatability. You can see that a zone consistently gathers traffic, but it is impossible to understand whether the current display yields a systemic result or works by chance. Without a link to the planogram and shelf metrics, any conclusions remain situational and scale poorly.
Thus, at the shelf level, the heatmap ceases to be an analytical tool. It does not answer questions about which display elements are working, which ones hinder assortment perception, and what exactly needs to be changed. To move from observation to management, another layer of data is required — one connected not to movement, but to the logic of product placement and compliance control.