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High-resolution imagery guarantees excellent quality of coastal topographic surveys. Alongside the rapid progress of remote sensing, digital photogrammetry and image processing in recent years using unmanned aerial vehicles (UAVs) provide outstanding opportunities for mapping the coastal zone, including the coverage of difficult-to-access areas, as is the Northern Bulgarian coast. Both spatial planning and integrated coastal zone management require highly accurate and up-to-date geodata, being among the main reaso...

The article presents some case studies of negative impact of human activities on underwater cultural heritage from Black Sea. A serious problem is the pollution and the litter disposal in the historical harbours. The resulting conditions often endanger some impressive and well-preserved underwater cultural heritage sites. An advanced methodology for litter registering and assessment was developed and applied using remote sensing with side scan sonar, subbottom profiler and orthophotography using a drone. The surve...