Measurements describe stored data, i.e. what is measured and in which unit.
Some values do not have an associated measurement or no information is present.
{ "type": "unitless" }
The type continuous specifies a continuous variable that is measured in a certain unit.
continuous
{ "type": "continuous", "measurement": "Reflectance", "unit": "%" }
A classification maps numbers to named classes.
{ "type": "classification", "measurement": "Land Cover", "classes": { "0": "Grassland", "1": "Forest", "2": "Water" } }