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Use of Principal Components for Scaling Up Topographic Models to Map Soil Redistribution and Soil Organic Carbon

Use of Principal Components for Scaling Up Topographic Models to Map Soil Redistribution and Soil Organic Carbon

Published on: October 16, 2018

Local variance for multi-scale analysis in geomorphometry.

Lucian Drăguţ¹, Clemens Eisank, Thomas Strasser

¹Department of Geography and Geology, University of Salzburg, Hellbrunnerstraße 34, Salzburg 5020, Austria.

Geomorphology (Amsterdam, Netherlands)

|July 23, 2011

Summary

The local variance (LV) method effectively identifies characteristic scales in geomorphometry using Digital Elevation Models (DEMs). This approach aids in analyzing land-surface parameters and classifying landforms across different scales.

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Area of Science:

Geomorphometry
Geospatial Analysis
Digital Elevation Model (DEM) analysis

Background:

High-resolution Digital Elevation Models (DEMs) present challenges for multi-scale geomorphometric analysis.
Detecting characteristic scales in land-surface parameters is crucial for understanding landforms.

Purpose of the Study:

To evaluate the local variance (LV) method for multi-scale geomorphometric analysis.
To assess the suitability of the LV method for detecting characteristic scales in DEM-derived parameters.
To explore the application of the LV method in different topographic settings.

Main Methods:

Applied the local variance (LV) method to Digital Elevation Models (DEMs).
Calculated LV and rate of change of LV (ROC-LV) across multiple scale levels.
Utilized both resampling (cell-based) and image segmentation (object-based) approaches for scale generation.
Analyzed slope gradient, plan curvature, and profile curvature.

Main Results:

The LV method successfully identified scale levels corresponding to homogeneous land-surface patterns.
The method performed better with scale levels generated through image segmentation compared to resampling.
Distinct patterns of geomorphometric parameters were observed across different scales.

Conclusions:

The local variance (LV) method is suitable for multi-scale geomorphometric analysis and characteristic scale detection.
Coupling multi-scale pattern analysis with morphometric primitive delineation is feasible.
This approach can contribute to hierarchical landform element classification.