Object representations at multiple scales from digital elevation models

TitleObject representations at multiple scales from digital elevation models
Publication TypeJournal Article
Year of Publication2011
AuthorsDrăguţ, L., and C. Eisank
Refereed DesignationRefereed
JournalGeomorphology
Volume129
Start Page183
Issue3-4
Pagination183-189
Date Published06/2011
ISSN0169-555X
Keywordsgeomorphometry, Landform, Landform elements, Local variance, Pattern analysis, Segmentation
Abstract

In the last decade landform classification and mapping has developed as one of the most active areas of geomorphometry. However, translation from continuous models of elevation and its derivatives (slope, aspect, and curvatures) to landform divisions (landforms and landform elements) is filtered by two important concepts: scale and object ontology. Although acknowledged as being important, these two issues have received surprisingly little attention. This contribution provides an overview and prospects of object representation from DEMs as a function of scale. Relationships between object delineation and classification or regionalization are explored, in the context of differences between general and specific geomorphometry. A review of scales issues in geomorphometry - ranging from scale effects to scale optimization techniques - is followed by an analysis of pros and cons of using cells and objects in DEM analysis. Prospects for coupling multi-scale analysis and object delineation are then discussed. Within this context, we propose discrete geomorphometry as a possible approach between general and specific geomorphometry. Discrete geomorphometry would apply to and describe land-surface divisions defined solely by the criteria of homogeneity in respect to a given land-surface parameter or a combination of several parameters. Homogeneity, in its turn, should always be relative to scale.

 

 

 

 
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URLhttp://dx.doi.org/10.1016/j.geomorph.2011.03.003
DOIDOI: 10.1016/j.geomorph.2011.03.003
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