A geocell is herewith defined as an area bounded by one degree of latitude and longitude. The earth-orb has 64,800 geocells. Most are quadrilaterals, but the 360 surrounding each pole are trilateral. Their length is constant; their width varies. A geocell is nearly square at the equator; narrows to a spike at the poles.

    Globes and maps usually show geocells—but in combinations that vary widely from item to item: e.g., 15 x 15º, 2 x 4º, etc. Till now, so elementary a terrestrial unit as 1º x 1º has gone unnamed. And the lumping of geocells in any map has been a haphazard detail.

    A meticulous one-degree world map or globe would depict all parallels and meridians, and all 64,800 geocells (except perhaps for 1º x 5º geocells within five degrees from the poles). I have never seen or heard of an entire world map or globe drawn to one degree. The Megamap described below would be the first to incorporate all geocells.

    Most commercial globes, typically twelve inches, show 15º intervals. A few European products have 10º. Even big showpiece globes lack a full set of geocells. FDR's 50-inch globe, now in the Library of Congress, only has 5º geocells. The National Geographic Society's 11-footer in  its Washington headquarters, is but a blow-up of its 15º twelve-inch model.

    Likewise for complete world maps: generally 15º, sometimes 10º, seldom 5º; and 1º—why bother?

    There is an obvious reason why a one-degree world map or globe may heretofore have seemed impractical: the traditional division of labor between notoriously distorted world maps (or unwieldy globes), and highly precise localized charts. If you want a rough—a very rough—idea of what's where on earth, you check a world map. If you want a more exact idea about the ebb and flow of Mideast boundaries, then you examine a sectional sheet or atlas, likelier to be at the one-degree level.

    There is also a subconscious reason, so to speak, for the nonexistence of one-degree world maps and globes. A one-degree resolution in most world maps would more vividly expose their un-realism, their gross exaggerations: their abuse of geocells transformed beyond any compatibility with a globe: if there was a one-degree globe to compare them with!

    Even without a one-degree globe, the deformations would be conspicuous. For, despite their variable width, all geocells are of the same length, mesh, and alignment. Bloat, stretch, and contortion would betray themselves all the more visibly if commonplace world maps were drawn to 1º. Many, many cancerous geocells would be conspicuous next to their more accurate neighbors.

    Furthermore, imagine an ordinary world map enlarged to 1/1,000,000—say, to an equatorial length of about 40 m (132'). Imperfections, and geocell distortion, which go unnoticed—and undepicted—in book size and wall size world maps would become intolerably grotesque if seen at the larger scale. Ergo, it just isn't done. Not at 1/10,000,000, much less 1/1,000,000. At these scales or larger, you must go to a provincial atlas, or separate national sheet-map series, or the non-integral sheets of the 1/1,000,000 International Map of the World (IMW).


    The conclusion we draw thus far is this: the word "geocell" did not exist in either geometry or cartography, and its lack was symptomatic of the inattention to that degree of resolution in world maps (as well as globes).


    In the lengthy course of designing and drawing the one-degree Megamap 1/1,000,000, I determined that a prime desideratum must be overall proportionality of the geocells—proportionality to the adjoining ones and to the network as a whole, and to a corresponding globe with all 64,800 geocells.

    I say proportionality. Of course, by nature, geocells on a sphere and a flat map cannot be identical. In the Cahill-Keyes "Real-World" Map, the equator and two meridianal great circles (20 & 110 W, etc.) match the scale of a hypothetical counterpart globe. All other meridians and parallels are progressively and proportionately shorter toward the center of the octant. I.e., all of the geocells have a specified amount of shrinkage vis-a-vis their global parent—but none of them is out of keeping with any other geocell on the globe, nor in adjacent ranks and files, nor anywhere in the entire  map.

    I make that statement as an artistic fact, not a geodetic one. The map is not accurate enough, thank goodness, for artillery fire or missile trajectories. But the map design, and my computation tables to four decimal places for all 64,800 geocells—their length, their width, and their x,y coordinates—are accurate enough to enable work to proceed on creating this largest of all world maps, this progenitor of the Coherent World Map System, this Megamap in a single frame, 20 x 40 m (66 x 132').

    Indeed, the tables could be used for a 1/100,000 version ten times longer, if there was a site for it; or a 1/10,000 ground plan for a "Fair World World Fair" or theme park 2 x 4 km. Except for the 1º x 5º geocells around the poles, the Megamap would contain in eye-pleasing array every single geocell on planet earth, and every single continent in uninterrupted entirety and in reasonable fidelity to those same profiles as seen on a globe.

    But that too is an artistic as well as a scientific judgment. To flatten a sphere, we must either stretch or shrink its surface differentially. The trade-off in the Megamap is its compression. Nonetheless, I aver that the Cahill-Keyes "Real-World" Map bears a better isomorphism to a globe than any other integral world map. And I invite skeptics to account for the size and disposition of every geocell in their alternative.

    All the continents share the shrinkage—some vertically and more horizontally—but not to an inordinate degree. Instead, every 1º geocell is in good shape, present and accounted for, in well-tempered collocation, none grossly at odds with any other geocell in the big picture.


    To summarize: the design for a single world map of unprecedented size has required a singular re-focus on an unappreciated (and previously undesignated) basic unit of mapping, whether plane or planet: namely. the geocell, one degree of latitude and longitude. It is the fine-tuned proportionality of a total geocell assemblage which enables the Megamap to serve both as a giant exhibition conspectus of the whole earth, and as the selfsame source of any partial or complete map at smaller or larger scales.

Returning to the "geocell" theme almost a quarter century later, now in the Internet age, I Googled geocell + latitude + longitude to see if such a concept had re-appeared: and indeed, it had. While not in any dictionary yet—and excluding non-cartographic variants such as for cell-phones or flood control—five technical online publications define the term as I had in 1983. All are military:

Presenting the Cahill-Keyes 1° Globe:
World's first and only Earth-globe drawn with a one-degree graticule

and

Around the World in 8 Easy Pieces:
The Cahill-Keyes 1-Degree Globe (Full size images of all 8 octants)