Polygonal simplification and its use in DEM generalization for land surface segmentation

2021 ◽  
Author(s):  
Richard Feciskanin ◽  
Jozef Minár
Keyword(s):  
Land Surface ◽  
Surface Segmentation

scholarly journals Physically-based land surface segmentation: Theoretical background and outline of interpretations

2018 ◽  
Author(s):  
Jozef Minar ◽  
Peter Bandura ◽  
Juraj Holec ◽  
Anton Popov ◽  
Lucian Drăguţ ◽  
...  
Keyword(s):  
Steady State ◽  
Potential Energy ◽  
Equilibrium State ◽  
Land Surface ◽  
Theoretical Background ◽  
Gravitational Potential Energy ◽  
Surface Segmentation ◽  
Physically Based ◽  
Input Variables ◽  
Definition Of

Incorporation of a physically-based general geomorphological theory directly into the segmentation algorithm is fundamental to physically-based land surface segmentation. Topographical steady state for morphostructural segmentations with five types of elementary forms defined by the principle of equilibrium provides a basis for definition of input variables. Examples of application introduce two new physically-based geomorphometric variables: Index of Steady State (ISS) quantifying the closeness of regions to a topographic steady state; and Index of Slope Disequilibrium (ISD), expressing percentage deviation from an equilibrium state of gravitational Potential Energy of Surface (PES) for mass flow.

Utilization of a comparison of curvatures for land surface segmentation

2013 ◽  
Vol 5 (4) ◽  
Author(s):  
Libor Burian ◽  
Jozef Minár
Keyword(s):  
Land Surface ◽  
Sudden Change ◽  
Current State ◽  
Field Independent ◽  
Surface Segmentation ◽  
Digital Elevation ◽  
The Difference ◽  
Elevation Model ◽  
Local Extreme

AbstractUtilization of a new geomorphometric variable for land surface segmentation — the angle of absolute curvatures — is a main goal of the paper. The angle of absolute curvatures is defined as the difference between the orientation of maximal curvature (field independent) and the orientation of the greater of the profile or the tangential curvature. Land-forms separated by three types of borders (A, B, C) can be delimited from the field of angles of absolute curvatures. Borders of A type are connected with a local extreme of slope. Borders of B and C type are connected with a change to the priority of either profile or tangential curvature, as shown in computation, respectively. Fields of altitude, slope, profile curvature, tangential curvature and rotor curvature are reflected by an algorithm. Distinct borders in the field of the angles of absolute curvatures are connected with a sudden change of value and with zero isolines in the previously mentioned fields. Spatially closed entities generated by this proposed algorithm are considered to be a variant of the elementary forms of the land surface. The quality of information generated by this algorithm depends on the size of the grid mesh of the input digital elevation model. The algorithm in its current state is suitable for locating the borders of some elementary forms in the first stage of geomorphology mapping.

scholarly journals Physically-based land surface segmentation: Theoretical background and outline of interpretations

2018 ◽  
Author(s):  
Jozef Minar ◽  
Peter Bandura ◽  
Juraj Holec ◽  
Anton Popov ◽  
Lucian Drăguţ ◽  
...  
Keyword(s):  
Steady State ◽  
Potential Energy ◽  
Equilibrium State ◽  
Land Surface ◽  
Theoretical Background ◽  
Gravitational Potential Energy ◽  
Surface Segmentation ◽  
Physically Based ◽  
Input Variables ◽  
Definition Of

Incorporation of a physically-based general geomorphological theory directly into the segmentation algorithm is fundamental to physically-based land surface segmentation. Topographical steady state for morphostructural segmentations with five types of elementary forms defined by the principle of equilibrium provides a basis for definition of input variables. Examples of application introduce two new physically-based geomorphometric variables: Index of Steady State (ISS) quantifying the closeness of regions to a topographic steady state; and Index of Slope Disequilibrium (ISD), expressing percentage deviation from an equilibrium state of gravitational Potential Energy of Surface (PES) for mass flow.

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