The Nature of Cartographic Representation: Epistemological Foundations

The Nature of Cartographic Representation: Epistemological Foundations

Maps occupy a peculiar position in the architecture of human knowledge. They are simultaneously among the most practical and most philosophical of artifacts—tools we use to navigate from one place to another, yet also constructions that shape how we understand the very nature of space, place, and territory. To ask what maps are is to pose a question that resists simple answers. A map might be a folded sheet of paper in a car's glove compartment, a glowing image on a smartphone screen, a mural adorning the wall of a government building, or a digital layer in a geographic information system. Yet beneath this diversity of forms and functions lies a persistent assumption that maps are, in some fundamental sense, representations of geographic reality—that they depict territories, illustrate spatial relationships, and convey information about the world we inhabit. This assumption, so deeply embedded in how we think and speak about maps, forms the starting point for the investigations that follow throughout this volume. Before we can trace the history of cartographic knowledge from antiquity to the satellite age, we must first confront the conceptually prior question of what cartographic representation actually is and how it functions.

The task is neither straightforward nor merely academic. Understanding the nature of maps matters because maps are never neutral. They embody choices about what to show and what to omit, whose knowledge counts and whose gets erased, which territories are named and how they are bounded. Maps have been instruments of colonialism, tools of military strategy, media of artistic expression, and technologies of everyday navigation. The decisions that shape their creation—decisions about projection, scale, symbolization, and generalization—carry epistemological, political, and ethical implications that extend far beyond the technical domain of cartographic production. To engage seriously with the history of cartographic knowledge is therefore to engage with questions about how humans have constructed, contested, and communicated spatial understanding across cultures and centuries.

The Problem of Definitional Assumptions

The conventional definition of a map as a "graphic representation of the environment" or a "scaled reduction of reality" has served cartography well as a working description, but it obscures more than it reveals when subjected to sustained philosophical scrutiny. Such definitions rest on what philosophers call a correspondence theory of truth, the notion that maps derive their meaning and validity from their ability to accurately mirror geographic reality—to depict the world as it "really is." On this view, a good map is one that gets the geography right, that places rivers where rivers exist, mountains where they stand, and cities where they were built. The history of cartography, from this perspective, becomes a narrative of progressive improvement, of maps gradually becoming more accurate as surveying techniques advanced, as more territory was explored, and as mathematical methods for representing curved surfaces on flat planes became more sophisticated.

This narrative has proven remarkably durable, and with good reason: it aligns with the experience of map users who consult maps to find their way, to locate unfamiliar places, or to understand the spatial relationships between different parts of the world. When a GPS device directs a driver to turn left at an intersection, the device's effectiveness depends on a correspondence between its digital representation and the physical road network. The correspondence theory captures something important about how maps function in practical contexts. Yet it fails to account for the many ways in which maps diverge from any straightforward mirroring of geographic reality and yet remain entirely legitimate as cartographic productions.

Consider the familiar example of subway and transit maps, which have appeared in various forms since the late nineteenth century but achieved their modern iconic status with Harry Beck's celebrated 1933 diagram of the London Underground. Beck's innovation lay not in geographical accuracy but in topological clarity: the famous tube map exaggerates distances between stations in the center of London while compressing distances toward the periphery, and it replaces the actual curved paths of underground lines with horizontal, vertical, and diagonal segments at fixed angles. The result bears only a loose resemblance to the geography of London as measured from above, yet it has been imitated by transit systems worldwide and has become one of the most recognizable graphic designs of the twentieth century. Transit maps work precisely because they do not correspond to geographic reality in any detailed sense; they sacrifice the metric accuracy that surveyors prize in favor of a schematic legibility that enables navigation. The question then arises: if correspondence to geographic reality is the measure of a map's quality, how do we evaluate the success of a map that deliberately abandons such correspondence?

This puzzle points to a deeper problem with the correspondence theory of cartographic truth. Maps do not merely reflect an objective geography that exists independently of human perception and social practice; they actively construct the spatial orderings through which territories become intelligible to particular audiences. A political map of the world depicts nation-states with precise boundaries, yet the boundaries themselves exist only insofar as they are recognized and enforced by human institutions. A tourist map of Paris highlights landmarks of interest to visitors while omitting the industrial facilities and working-class neighborhoods that define other aspects of the city. A naval chart focuses on water depths and navigation hazards, rendering the surrounding landmasses as minimal coastlines while the information crucial to a land-based traveler disappears from view. In each case, the map is selective, partial, and shaped by the purposes and perspectives of its makers and users. No map depicts everything, and the decisions about what to include and exclude are never merely technical but always consequential.

Maps as Arguments, Performances, and Tools

The limitations of conventional definitions have prompted cartographers and theorists from multiple disciplinary backgrounds to develop alternative frameworks for understanding what maps are and do. Three influential formulations merit particular attention, as they recur throughout subsequent chapters of this volume and provide conceptual resources for the historical investigations that follow.

The first and perhaps most influential is J. Brian Harley's characterization of maps as "arguments." Harley, whose 1989 essay "Deconstructing the Map" became a touchstone for critical cartography, drew on the work of rhetorical theorists and poststructuralist philosophers to argue that maps should be understood not as objective mirrors of reality but as persuasive instruments that advance particular claims about the world. On this view, every map makes arguments—claims about what exists, where it is located, and how it relates to other things—regardless of whether the map's maker consciously intends to persuade. A map that depicts a disputed territory as belonging to one nation rather than another argues for a particular political claim, even if the cartographer who produced it believed they were simply representing geographical fact. The power of maps as arguments derives partly from their apparent objectivity: unlike verbal claims, which are readily recognized as interpretations, maps present themselves as neutral descriptions of what is, lending their persuasive force an air of empirical authority.

Harley's argument has been elaborated and critiqued by subsequent scholars, but its central insight—that car