korkeuskohtia

Korkeuskohtia, the plural of korkeuskohta, refers to discrete, precisely measured elevations at specific points on the Earth's surface used in Finnish cartography and surveying. Each korkeuskohta denotes the height of a defined location and is typically expressed in meters above mean sea level (m a.s.l.). On traditional topographic maps, korkeuskohtia are shown as a point with an accompanying height value rather than as a continuous line.

Origin and purpose: The term combines korkeus (height) and kohta (point). In mapmaking and surveying, korkeuskohtia serve as reference elevations for geodetic networks, map control, and validation of digital elevation models. They are helpful for engineering projects, navigation, and land management, providing exact height information at key locations.

Distribution and data: On printed maps, korkeuskohtia appear as labeled dots; in GIS data, they are point features with z-values or height attributes. They complement contour lines by giving precise elevations at specific locations such as hilltops, depressions, benchmarks, or survey stations. They may originate from field surveys, GNSS measurements, levelling, or remote sensing.

Accuracy and updates: The reliability of korkeuskohtia depends on measurement methods and data sources. They can be updated as new measurements are obtained or as geodetic reference frames evolve. Height values are influenced by the sea level definition and the reference system used, and may vary between datasets.

In modern practice, korkeuskohtia coexist with digital elevation models and contour data, helping users interpret terrain and perform engineering calculations. Related terms include contour lines, benchmarks, digital elevation models, and topographic maps.