Invasion ranges

[dorn]

Has anybody idea why invasion circle around Massaua (Eritrea) is smaller than any other in the Mediterranean?

Game2_Italy_start.7z (289.37 KB)

[noshurviverse]

If I had to guess, I would assume because it's outside of a home zone?

EDIT: Just loaded up a 1900 Japan game. The territory is SE Asia has less invasion range than the home territories in NE Asia.

[aeson]

Map projection issues. Specifically, Massau, Eritrea is closer to the Equator than anything in the Mediterranean is, Rule the Waves uses a Mercator projection or something close to it, and the Mercator projection and its derivatives preserve bearing but distort sizes - things further from the equator appear larger relative to things closer to the equator than is actually the case. It's more noticeable the further you are from the equator - just look at the variation in the apparent sizes of the invasion range circles for the USA in 1900, for example (in particular, look at Anchorage and Dutch Harbor in comparison to pretty much anywhere else, or even to one another):

but it's still there for things that are relatively close together.

A second example, with late-game 850nmi invasion range tech rather than start-of-game 250nmi invasion range:

EDIT: Just loaded up a 1900 Japan game. The territory is SE Asia has less invasion range than the home territories in NE Asia.

Is Greenland actually comparable in size to Africa? Looks like it on the map used by the game, but in reality it's only about 2 million square kilometers whereas Africa's about 30 million. Perhaps the ratios of apparent sizes should not be assumed to be indicative of the actual ratio between distances at different points on the map?

Also, compare the size of the invasion range circle around Seattle, Washington (Western USA) with the size of the invasion range circle around San Diego, California (Western USA). Notice anything that might be interesting for the theory that it's a home possession/sea zone versus non-home possession/sea zone issue? The circle around Seattle is noticeably larger than the circle around San Diego.

[christian]

Sept 16, 2019 16:17:53 GMT -6 aeson said:

Map projection issues. Specifically, Massau, Eritrea is closer to the Equator than anything in the Mediterranean is, Rule the Waves uses a Mercator projection or something close to it, and the Mercator projection and its derivatives preserve bearing but distort sizes - things further from the equator appear larger relative to things closer to the equator than is actually the case. It's more noticeable the further you are from the equator - just look at the variation in the apparent sizes of the invasion range circles for the USA in 1900, for example (in particular, look at Anchorage and Dutch Harbor in comparison to pretty much anywhere else, or even to one another):

but it's still there for things that are relatively close together.

A second example, with late-game 850nmi invasion range tech rather than start-of-game 250nmi invasion range:

EDIT: Just loaded up a 1900 Japan game. The territory is SE Asia has less invasion range than the home territories in NE Asia.

Is Greenland actually comparable in size to Africa? Looks like it on the map used by the game, but in reality it's only about 2 million square kilometers whereas Africa's about 30 million. Perhaps the ratios of apparent sizes should not be assumed to be indicative of the actual ratio between distances at different points on the map?

Also, compare the size of the invasion range circle around Seattle, Washington (Western USA) with the size of the invasion range circle around San Diego, California (Western USA). Notice anything that might be interesting for the theory that it's a home possession/sea zone versus non-home possession/sea zone issue? The circle around Seattle is noticeably larger than the circle around San Diego.

noticed this as well around sakhlin and alaska the zones defeneatly stretch when not at equator

most likely due to map type as you said

[dougphresh]

In Africa and the Med especially, I think adjacent possessions should allow invasions. You wouldn't have to sail from Cape Town to invade Angola.

[dohboy]

Sept 19, 2019 8:02:31 GMT -6 dougphresh said:

In Africa and the Med especially, I think adjacent possessions should allow invasions. You wouldn't have to sail from Cape Town to invade Angola.

True, but by the time you got there you would wish you had. It's almost 3,000km from Cape Town to Luanda, in the straight line you wouldn't be able to travel. Armies have starved to death far closer to home with much better roads to travel.

[jishmael]

Sept 19, 2019 10:14:38 GMT -6 dohboy said:

Sept 19, 2019 8:02:31 GMT -6 dougphresh said:

In Africa and the Med especially, I think adjacent possessions should allow invasions. You wouldn't have to sail from Cape Town to invade Angola.

True, but by the time you got there you would wish you had. It's almost 3,000km from Cape Town to Luanda, in the straight line you wouldn't be able to travel. Armies have starved to death far closer to home with much better roads to travel.

Also we only control naval invasions with transports and such, not the targets for the army

[dizzy]

The circles may be bigger, but the ranges between cities seems ok. From Korsakov to Petropavlovsk actual distance is 832 miles, which is within my invasion range of 850 miles. New Caledonia is within range of Brisbane, actual miles are 914 to Noumea. So although the circles are bigger in the north than the south, the ranges are accurate, it seems to me.

[williammiller]

The flat map provides a visual representation of the areas and locations, but IIRC the globe map is used for actual distances for such things.