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Swedish Mountain Region Tree Line Analysis (Arcgis or QGIS)

I’m conducting a small analysis of tree line dynamics in the Swedish mountain region using historical and modern satellite imagery, DEM (Digital Elevation Model) data, and geological layers. The main goal of the project is to quantify the changes in the tree line position over time, understand its relation to various topographical and geological factors, and visualize these changes in a clear and impactful way. I have the data needed available and need help putting everything together in either ArcGis or Qgis. What I need help with: Important: The DEM data determines the area analyzed! Data Preparation and Preprocessing • Integrating satellite imagery (Landsat MSS, TM, ETM+, OLI, and Sentinel-2) from different years (1973, 1982, 1990, 2000, 2013, and 2024). • Processing DE...