Base type for all point sampling features - discrete locations where
samples are collected or measurements made. Point sampling features represent
zero-dimensional sampling positions at the scale of the investigation. Examples
include CPT soundings, groundwater monitoring points, surface soil sample locations,
and probe test positions. While these features may have physical dimensions (e.g., a
monitoring well has a diameter), they are treated as points because their spatial
extent is negligible compared to the investigation area. Point features are
characterized by a single location coordinate.