Geomorphometry

Geomorphometry

Geomorphometry is a scientific field that involves the quantitative analysis of land surfaces. It is primarily used in terrestrial investigations and relies on digital elevation models. Geomorphometric measurements and analysis are typically conducted using LiDAR-derived digital elevation models within a Geographical Information System (GIS).From: Geoinformatics for Marine and Coastal Management [2019], Meteorite crater re-interpreted as iceberg pit in west-central Sweden [2021]

General geomorphometry, derivatives of altitude, and descriptive statistics

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Published in Richard J. Chorley, Spatial Analysis in Geomorphology, 2019

Ian S. Evans

Both branches of geomorphometry have their strong and weak points. General geomorphometry deals with surface altitude, gradient, distance and area, often in combination as in hypsometry, which relates area to altitude. In these fundamental concepts, it is quite objective; there are, however, derivative concepts such as convexity, relief, dissection and texture, which allow for more variability in operational definition. General geomorphometry as a whole provides a basis for the quantitative comparison even of qualitatively different landscapes, and it can adapt methods of surface analysis used outside geomorphology. Specific geomorphometry is more limited; it involves more arbitrary decisions, and leaves more room for subjectivity in the quantification of its concepts. On the other hand, its variables are more closely related to process, which is usually invoked in the operational definitions.

Meteorite crater re-interpreted as iceberg pit in west-central Sweden

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Published in GFF, 2021

Christian Öhrling, Henrik Mikko, Gustaf Peterson Becher, Carl Regnéll

The mapping as well as the geomorphometric measurements and analysis was conducted on LiDAR-derived digital elevation models (©Lantmäteriet) in a Geographical Information System (GIS). The digital elevation model has a 2 m horizontal and 0.25 m vertical resolution and provide a “bare earth” view of the landscape, giving unprecedented possibilities for mapping and a great tool to study mesoscale landforms (Johnson et al. 2015). Multiple hillshade (0°,45°,315°) and slope derivatives of the elevation model was used to minimize the bias of hillshade azimuth direction.

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General geomorphometry, derivatives of altitude, and descriptive statistics

Meteorite crater re-interpreted as iceberg pit in west-central Sweden