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Delineation of valleys and valley floors


Straumann, Ralph K; Purves, Ross S (2008). Delineation of valleys and valley floors. In: Cova, T J; et al. Geographic Information Science. Berlin, Heidelberg: Springer Verlag, 320-336.

Abstract

Methods to automatically derive landforms have typically focused on pixel-based, bottom-up approaches and most commonly on the derivation of topographic eminences. In this paper we describe an object-based, top-down algorithm to identify valley floors. The algorithm is based on a region growing approach, seeded by thalwegs with pixels added to the region according to a threshold gradient value. Since such landforms are fiat we compare the results of our algorithm for a particular valley with a number
of textual sources describing that valley. In a further comparison, we computed a pixel-based six-fold morphometric classification for regions we classified as either being, or not being, valley floor. The regions classified as valley floor are dominated by pla nar slopes and channels,
though the algorithm is robust enough to allow local convexities to be classified as within the valley floor. Future work will explore the delineation of valley sides, and thus complete valleys.

Abstract

Methods to automatically derive landforms have typically focused on pixel-based, bottom-up approaches and most commonly on the derivation of topographic eminences. In this paper we describe an object-based, top-down algorithm to identify valley floors. The algorithm is based on a region growing approach, seeded by thalwegs with pixels added to the region according to a threshold gradient value. Since such landforms are fiat we compare the results of our algorithm for a particular valley with a number
of textual sources describing that valley. In a further comparison, we computed a pixel-based six-fold morphometric classification for regions we classified as either being, or not being, valley floor. The regions classified as valley floor are dominated by pla nar slopes and channels,
though the algorithm is robust enough to allow local convexities to be classified as within the valley floor. Future work will explore the delineation of valley sides, and thus complete valleys.

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Additional indexing

Item Type:Book Section, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Language:English
Date:2008
Deposited On:27 Oct 2008 11:54
Last Modified:05 Apr 2016 12:29
Publisher:Springer Verlag
Series Name:Lecture Notes in Computer Science
Number:5266/2
ISSN:0302-9743
ISBN:978-3-540-87472-0
Funders:The research reported in this paper was partially funded by the project TRIPOD supported by the European Commission under contract 045335.
Additional Information:Proceedings of the 5th International Conference, GIScience 2008, Park City, UT, USA, September 23-26, 2008. The original publication is available at www.springerlink.com, LNCS online.
Publisher DOI:https://doi.org/10.1007/978-3-540-87473-7_21

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