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Instituto Politécnico de Bragança (2017)

Application of repeat photography in landscape change analysis in the region of Bragança, Portugal

Naciri, Hind

Titre : Application of repeat photography in landscape change analysis in the region of Bragança, Portugal

Auteur : Naciri, Hind

Université de soutenance : Instituto Politécnico de Bragança

Grade : Mestrado em Gestão de Recursos Florestais 2017

Résumé
Nowadays, landscape change analysis is occupying a prominent place among ecological studies, as it re ects the crucial role landscapes play in the dynamics of populations. This change can be assessed via a multitude of means, at di erent scales, depending on the nature of the study areas, the aimed objective of the research and the user’s level of expertise. One of the techniques that stands out in this eld of study is repeat photography (RP), as it provides an exhaustive follow-up of the occurring changes through time. Yet, in order to accomplish a deeper image analysis, tools are required to extract qualitative and quantitative information and process the photographs. The aim of the present work is to select and assess methods of visualization, description and comparison of chronological series of aerial oblique photographs to landscape change analysis in the Bragan ca region of Northeastern Portugal. The two main presented tools in this study are the Image Analysis Toolkit (IAT), by the Mountain Legacy Project (MLP), and the WSL Monoplotting Tool by the Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Bellinzona, Switzerland. IAT allows users to display and analyze single or multiple images (up to three images side by side). The editing is rudimentary, as it allows creating segmentation masks on the platform, that can be saved to the users own o ine le system. The WSL tool , allows to analyze photographs by allowing extraction of spatially referenced vector data from oblique photographs. Such tools require georeferenced images taken repeatedly from the same spot over the years in order to ensure the repeat aspect of the process. Their outputs may vary from GIS maps to freehand sketches, depending on how advanced the study is. The selection and assessment of these computer tools was based on criteria such as accessibleness, data formats, friendliness, and others.

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