Abstract: [Purposes]To achieve dynamic monitoring and stability assessment of the coastline in Weifang,Shandong province,we established a monthly-quarterly remote-sensing monitoring system covering the city's 158 km shoreline.The primary dataset comprised seven dates of 2 m resolution domestic satellite images (GF-1/6,ZY-1/E/F,etc.) acquired from December 2023 to June 2024.[Methods]After ortho-rectification in PIE-Ortho,block adjustment,NND fusion and projection to CGCS2000,ortho-images with a planimetric RMSE ≤ 5.09 m were generated.Shoreline-change patches were extracted by integrating visual interpretation and deep learning,and 15 suspicious sites were field-checked.[Findings]Based on shoreline type,land-use status and seaward land-cover classification,the results show that: ①Artificial shoreline accounts for 52.0% of the total length,with reclamation expanding at a rate of 0.85 km per quarter; ②Areas of high human-activity intensity are concentrated in Hanting District and Shouguang Port; and③The coastline is generally stable,with erosion/encroachment detected only on the east bank of the Mihe diversion gate.[Conclusions]This study provides timely and high-precision quantitative remote-sensing information for the refined management of the coastal zone.

Key words: domestic satellite, 2 m resolution, coastline monitoring, Weifang