Members
airreadonly
0 on an airless world, 1 under a thick one. The erasure driver.
airMassreadonly
Atmospheric column mass, kg/m². Zero on an airless world.
surfaceDensity · scaleHeight, which is P/g — Earth comes out at 10,200
against a measured 10,330. A pressure rather than a boolean, because crater
erasure and dune fields both scale with how much air there is: Mars has 2%
of Earth's column and keeps most of its craters, Venus has a hundred times
Earth's and has essentially none.
archetypereadonly
bandsreadonly
biotareadonly
Whether anything grows here, 0..1.
Water, air, and a temperature a liquid-water chemistry survives — which is
a narrower window than liquidWindow's water band, because a sea at 380 K
is a sea and not a place with a biosphere on it. The design bible's flora
biomes are post-MVP (content § biomes);
this is the pigment they will stand in, written into the cover so that a
temperate world reads as one from orbit rather than as a wet desert.
chaosreadonly
Voronoi block rafts. 0..1.
complexDiameterreadonly
Diameter where crater floors flatten and central peaks appear, meters.
craterDensityreadonly
Areal crater density against saturation. 1 is the lunar highlands.
densityreadonly
Bulk density, kg/m³.
drainagereadonly
How deeply that liquid carves valleys into the landform, 0..1.
dunesreadonly
Anisotropic wind-blown relief. 0..1.
erosionreadonly
Slope damping for the relief band — the analytic stand-in for erosion.
gravityreadonly
Surface gravity, m/s².
groundTemperaturereadonly
And what the ground under that air is at, Kelvin.
Equal to temperature on an airless body and 2.4 times it on Venus. It
is the one the surface answers to — where the volatiles condense, and
eventually how fast the rock creeps. See surfaceTemperature.
hotspotCountreadonly
icyreadonly
0 for rock, 1 for ice. Continuous, because the mixed bodies are the point.
largestCraterreadonly
The largest crater the field places, meters.
liquidreadonly
How much running liquid works the surface, 0..1.
Zero without air — a liquid at the surface of an airless body boils or
freezes on the spot, whatever the temperature says — and zero outside the
windows in liquidWindow. Magma does not count: a lava sea stands and a
lava channel is a volcanic feature, not a drainage one.
liquidKindreadonly
What stands as a liquid on this ground, if anything does. See liquidKind.
On the grammar rather than derived at every reader because three of them disagree about what the answer is for: the sea's color, whether the band stack carves valleys, and whether anything photosynthesizes. Null on a body whose ground is too hot or too cold for any of the three.
meanRadiusreadonly
(a·b·c)^(1/3), meters — the radius the field's angular scales convert through.
mobilityreadonly
0 for a stagnant lid, 1 for a world whose plates move freely.
oceanicFractionreadonly
Fraction of plates that are ocean floor rather than continent.
plateCountreadonly
Plate nuclei. 1 is a stagnant lid and means one plate, not none.
relaxationreadonly
How far large old craters relax toward palimpsests. 0..1.
reliefLimitreadonly
Relief the material and the body's own size permit, meters.
reliefSourcereadonly
Which of the three limits bound it — or 'measured', where somebody has
flown over the body and the archive overrides all three.
Recorded rather than re-derived, because reliefLimit is not always what
bound the body and the comparison cannot tell afterward. See
reliefLimitSource.
stripesreadonly
Great-circle troughs. 0..1.
sulcireadonly
Parallel grooved bands. 0..1.
temperaturereadonly
tidalProxyreadonly
youngreadonly
0 on a dead surface, 1 on one the tide is still working.