A method exploration on measuring the changes of sand ridges in exposed radial sand ridges area by means of remote sensing technology

摘要

Present study took into account the relationship between surface soil moisture of intertidal zone and its spectral reflectance and the relationship between surface soil moisture and the relative elevation of intertidal zone to extract 'ridges'. It can represent the main morphological character of radial sand ridges, and find specific spectral bands to diagnose much 'drier' points of sand ridges in low tidal condition. This could be considered as much higher points of sand ridges. On that basis the ridges' changes were also discussed in this paper. Based on spectral analysis and comparison between extracted sand ridges and field measured elevation, the results demonstrated that the sensitive band centered at 2 224 nm has an excellent potential to extract sand ridges, furthermore the extracted sand ridges matched with field measured elevation accurately.