System & Planet

Maps & Description


The following maps have been produced by Jonathan Pearson based upon the sketch map found in the GDW Invasion Sourcebook (Page 41).

Political Map of Joi

Political Map of Joi

This map is a coloured version of the GDW Invasion Sourcebook original. The coloured areas represent land under "cultivation".

Climate Map of Joi

Climate Map of Joi

This map takes the GDW Invasion Sourcbook original and attempts to define the likely climate conditions present across the globe. I have used a simplified version of the Koppen climate clasification system. This splits climates firstly by temperature range criteria (indicated by the first letter) which are then subdivided (indicated by a second and third letter). The map includes an explanatory key along with Terrestrial examples. The climate types were assigned on the basis that Joi's climate is identical to that of Earth except that the landmasses are in a different position. Thus the east coast of a continent between 20 and 35 N and S will have similar climates to the SE of the USA or Argentina (Type Cfa as it happens - humid subtropical). I have included the prevailing surface wind directions (red arrows) generated by the interaction of the solar heating and the corriolis force (Hadley Cells). Also shown are the surface ocean currents (blue arrows) which I basically guessed at based on Earth's equivalents.

The climate types listed are as follows.

CategoryDescriptionTerrestrial Example
AEquatorial. On Earth the equatorial climates are divided up into various sub-divisions that depend upon the local variations produced by changes in the trade winds, the convergence zone and the monsoon. As I have not attempted to model these aspects I have simply classified all regions between 15 N and S as equatorial.Brazil, Central Africa, SE Asia
BArrid and Semiarrid. As with the type A climates above the type Bs are also subdivided on Earth, again due to local conditions. These regions are commonly known as either deserts or steppes.North Africa, Russian Steppes, Canadian Prairies
Cfa & CwaHumid Subtropical. Warmer and wetter summers with much of the rainfall due to thunderstorms coming off the ocean. Winters usually mild and sunny although occasional frosts are possible.SE of USA, Southern China
Csa & CsbMediterranean. Hot dry summers with cool, wet wintersMediterranean, Southern California
Cfb & CfcMarine West Coast. Ample year round ranfall with few extremes of temperature (mild winters and moderate summers).Western Europe, New Zealand
Dfa, Dfb, Dwa & DwbHumid Continental Hot summers and cold winters with ample precipitation throughout the year. Usually continous snow cover for one or more of the winter months.NE of USA, Central Europe
Dfc, Dfd, Dwc & DwdContinental Subartic Long bitterly cold winters with short, clear days and relatively little snowfall and low humidity. Summers are short and mild with long days and ample rainfall.Alaska, Newfoundland, Scandanavia, Siberia
ETTundra. Long cold winters and short mild summers although snow and frost are possible at any time of year.Northern coasts of Eurpoe and North America, Coastal regions of Greenland.
EFPolar. Temperatures below freezing throughout the year. Generally very low precipitation.Arctic and Antarctic

Cylindrical Projection of the Whole Planer

The image below is a low resolution version of the map. The high resolution version can be found on the following link.

Cylindrical Projection of Globe (1.1 MB)

Cylindrical Projection of Globe

Using the GDW Invasion Sourcebook original, the above climate model and NASA's "Blue Marble" images of Earth I constructed a cylindrical projection view of Joi as seen from orbit. This can be wrapped around a sphere by most 3D programs - which is what I have done for a view of each colony and continent below.

"Cloudless" Views of the Colonies

Elysia (Former French Colony)

Elysia from Space

The Joienne Republic of Elysia occupies the island continent between the South Pole and the western part of the largest continent of Pays de Verde.

New Cornwall (British Colony) and Lubumbashi (Azanian Colony)

New Cornwall and Lubumbashi from Space

New Cornwall lies on the west coast at the southern end of the land bridge between the eastern part of the largest continent of Pays de Verde and the South Polar continent. Lubumbashi lies inland of New Cornwall.

Toshasimizu (Japanese Colony) and Halbinsel (German Colony)

Toshasimizu and Halbinsel from Space

Toshasimizu occupies the eatern tip of the second largest contient of Pays d'Esperence while Halbinsel lies on the western tip of the western part of the largest continent of Pays de Verde. Thus Toshasimizu is on the western side of the straits leading to the North Polar Sea (in the centre of the image) while Halbinsel is on the eastern side.

General Views of the Planet

Eastern Part of Pays de Verde

Eastern Pays de Verde

The Pays de Verde is the largest continent on Joi and is split into two parts. The eastern part, which makes up roughly a third of the whole, is joined to the Southern Polar Contienent by a substantial land bridge.

Western Part of Pays de Verde

Western Pays de Verde

The Pays de Verde is the largest continent on Joi and is split into two parts. The western part, which makes up roughly two-thirds of the whole, is a similar size to the whole of the Pays d'Esperence (the second largest continent). Western Pays de Verde is separated from the Pays d'Esperence by the Mediterreanean Ocean which narrows significantly at both the northern and southern ends where the two continents are separated by relatively narrow straights, albeit still several hundred kilometres wide.

Pays d'Esperence

Pays d' Esperence

The Pays d'Esperence is Joi's second largest contient. To the east, across the is the Mediterreanean Ocean, is the Pays de Verde while to the west is Joi's Great Ocean.

North Pole

North Pole

Joi's North Pole (like Earth's) is purely ice floating on the North Polar Ocean - there is no North Polar landmass.

South Pole

South Pole

Joi's South Polar cap overlies the South Polar Continent which is itself joined to the eastern part of the Pays de Verde by a substantial land bridge.

Animations of the Planet

My 3D program also does animations which for those of you with broadband can be found below.

Quicktime movie of rotating globe with a cloudless sky (2.1 MB).

Quicktime movie of rotating globe with cloud patterns (3.3 MB).

The Quicktime viewer can be downloaded from Apple.


Joi is a strange world to Earthly eyes. Its unusual geology (the geologically recent cessation of plate tectonics) has resulted in very flat landmasses with few mountains of any kind with the continents rising gently from the surrounding oceans to a central plateau. While the Joian landscape may be smooth on the global scale locally the processes of errosion have taken their toll. Thus rivers have carved channels, the cycling of glaciers has scraped valleys and waves and tides have have shaped the coastlines.

Version 1.0


Copyright J.M. Pearson, 2004

System & Planet