I have consistently made world mapping too hard. Quick and dirty world build my land and sea with d% rolls. Each number is the area of each bit of landmass or ocean. It's ocean if the # is greater than 29% or whatever your target land ratio is. Blob zero is at tht north pole, blob one is adjacent. This is quick and dirty, remember? 8-P

43, polar ocean 

65, adjacent ocean, may merge, 108 m. km^2 total, 0% land...

41, more ocean, 149 total

28, landmass!!! 28/177 is 15.82% land

Continue until we have an earth sized world, setting a default of ~500 m. km^2 surface area.

So far we have roughly the northern third of the world, the three ocean blobs would be a little more than down to ~30 degrees north latitude.

How about a situation? 

40, 25, a 25 year old woman rescues... 56, 24, a 24 year old woman. From drowning? 40 under 56%, yes, a flash flood, younger woman drove into deeper water than they expected and the car went floating 

Mass of aliens: 2 d% rolls, 46 and 55, normal range of 46 to 55 kg, or take the higher # and use +/-46%? That's a range of 30 to 80 kg, 66 to 176 #s, average of 121 #s.

Bilateral or radial symmetry? 60% chance bilateral, 44 is a yes. Bilateral evolved from 'fish'. That last is just a judgement call, crawled up into the mud with more that two pairs of legs? 36 under... 36%? Interesting. Yes. More than three pairs? 51 over 44%, so no, three pairs, a centauroid?

What chance of a survival game, pandemic or mega volcano? 46%, rolled a 35, so MV and pandemic at the same time...

43 and 48, a 43 year old man

39 and 49, another man, 39 are they related?

51% chance, 37, yes cousins, Mom's are or were sisters...

Yet another Oracle ..

D% roll- 43% chance of aliens; 76, which is a fairly strong no, a 76% chance that this isn't my usual starfish aliens, tramp merchant strange old worlds for fun and profit setting.

Strongly opposite that is medieval fantasy, which I am not interested in doing, either...

draw a line

Pick points to make a triangle.

stuff!

Oops!

We need to do a solo rpg session.

move around in a map

Pick points to make a triangle.

stuff!

Oops!

Set of d% quick and dirty procedures.

Build a map of diamond quads

Pick points to make a triangle.

stuff!

Oops!

Two d% rolls, again.

46 and 51 would be a 46 year old man, or perhaps we pass/fail some other thing than male or female, and age is the lowest of two or more d%.

Okay...

Something weird, something wonderful!

Diamond quads, find a point within the canvas.

Land or water? Land if 2nd d% is less than the 1st d%, and use the lesser # for the amount, like I do with an age and gender roll for a random PC.

Do diagonals again?

Pick points to make a triangle.

stuff!

Oops!

Another wasted Saturday night...

Ocean, shore, wetlands, grassland, forest, mountains, desert, seven terrain types. d% times seven, round up, 1 to 7. .59*7 is 4.13, round up to 5, forest. Each terrain tile is an up or down triangle, roll d% vs d%,  if the 2nd roll is less than the first, an up, northerly triangle, vs a down, southerly triangle. 1st is 51%, 2nd is 43%, up or northerly.

Diamond quad instead?

D% for size and type of terrain, type then size, two rolls?

Biomes: grassland, forest, wetlands, desert, ocean.

Grassland can border ocean, desert, forest or wetlands, plus wetlands.

Ocean borders grassland or ocean 

Forest borders grassland, wetlands or forest.

Wetlands border grassland, forest, or westland.

Desert borders grassland or desert.

Add mountains to forest and desert?

D% = 65%

39, 75: 39 land out of 114.

Assigning terrain biome by accretion?

Chance of an alien is 61%: 48, so yes and one trait is 48%.

Flying and fighting and singing.

Butterfly wasp alien bards?

79% chance of a dog; 45

A nice big dog...