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Rock glacier mapping: a method utilizing enhanced TM data and GIS modeling techniques / J.R. Janke in Geocarto international, vol 16 n° 3 (September - November 2001)  

Public [article]  inGeocarto international > vol 16 n° 3 (September - November 2001) . - pp 5 - 15 Titre : Rock glacier mapping: a method utilizing enhanced TM data and GIS modeling techniques Type de document : Article/Communication Auteurs : J.R. Janke, Auteur Année de publication : 2001 Article en page(s) : pp 5 - 15 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] accentuation de contours [Termes IGN] carte topographique [Termes IGN] Colorado (Etats-Unis) [Termes IGN] détection de contours [Termes IGN] glacier [Termes IGN] image Landsat-MSS [Termes IGN] image Landsat-TM [Termes IGN] système d'information géographique Résumé : (Auteur) Rock glaciers, an important component to alpine systems, have been identified as an indicator of permafrost, distribution as well as a resource for humans, serving as backdrops for residential areas, dam abutments, and a water source for urban areas. As a result, mapping is imperative ; however, a simple method for rock glacier detection has not been developed. Traditionally, rock glaciers have been mapped using field techniques or aerial photography. Spaceborne Landsat MSS data has proven to be ineffective for identifying rock glaciers. The purpose of this research is to establish a modeling procedure to identify rock glaciers of the Blanca Massif of Colorado utilizing Landsat TM data, image enhancements, and ancillary DEM data. I used a topographic normalizing function to reduce shadows, band ratios and principal components to emphasize rock glaciers, edge enhancements to detect all distinct rock glacier borders, and a 1:20,000 DEM to restrict the study area to criteria common to all rock, glaciers : elevations greater than 11,000 feet and a slope between 0° and 21°. Each of the enhancement techniques was tested individually and in combination with each other. The combination image, which utilized all of the enhancements, provided the greatest classification accuracy. The overall classification accuracy of rock glaciers in the Blanca Massif was 81.0%. Tests revealed that rock glaciers greater than 3.65 hectares can be mapped. These findings suggest that Landsat TM data, when used in conjunction with a combination of ratios, principal components, edge enhancements, and DEM data, can be used to accurately map most rock glaciers. Numéro de notice : A2001-148 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040108542199 En ligne : https://doi.org/10.1080/10106040108542199 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21843 [article]

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