a) containment, where the position is within the geographic feature, for example in a country;
b) based on local measurements, where the position is defined relative to a fixed point or points in
the geographic feature or features, for example at a given distance along a street from a junction
with another street;
a) loosely related, where the position has a fuzzy relationship with the geographic feature or
features, for example adjacent to a building or between two buildings.