Tourism Pressure Index (TPI) for the Marmara Region, Türkiye: 250 m surface and derived layers

Tourism Pressure Index surface (250 m, EPSG:32635, land-masked, 88,102 valid cells) for the Marmara Region of Türkiye, with the derived distance-to-coast and built-up-fraction layers and district-level statistics for 128 district units. Produced with release v1.2.1 of the open processing chain (https://doi.org/10.5281/zenodo.23459205) from OpenStreetMap, the TÜRÇEV Blue Flag list 2026 and ESA WorldCover 2021. See README.md for grid definition, value ranges and attribution. Funded by the Scientific Research Projects Coordination Unit of Istanbul University, Project FBA-2025-41316.