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Accurate monitoring of crop phenology is essential for yield estimation, growing season modeling, and climate adaptation in agriculture. While freely available satellite archives provide broad spatial coverage, their temporal frequency is often insufficient for capturing the rapid phenological transitions characteristic of crops. This study addresses that gap through a multitemporal analysis of the Normalized Difference Vegetation Index (NDVI) derived from a time series of 119 PlanetScope satellite images at 3 m s...

This study presents the application of integrated UAS and terrestrial close-range photogrammetry for the comprehensive 3D reconstruction of the cultural heritage site “St. John Letni” chapel, located near Pchelina Reservoir, Bulgaria. The main objective of the research is to produce detailed and accurate documentation of the chapel in its current condition, supporting its long-term preservation and potential restoration. The data acquisition combines aerial imagery from an unmanned aerial system (UAS) and terr...