Extracting Wetland Information Form SPOT5 Imagery in Nansihu Area of Shandong Province

Wetland is a kind of natural resource with fast dynamic changing. The study of wetland information extracting way which is fast and measurable is front of wetland remote sensing. SPOT5 imagery has high spatial resolution and multi-spectral resolution, which provided a rich, reliable and accurate source data for wetland resources investigation. This paper took the Nansihu wetlands as the study area and combining with the characteristics of SPOT5 imagery discussed wetland resources investigation methods. In the study, SWIR band threshold method was used to extract information of water bodies, Spectral Relations method was used to get rid of shadows from extraction of water bodies and Visual Interpretation method based on GIS information was used for the extraction of other type wetlands. Using above method, Nansihu area 12 categories wetlands information were extracted. Practice proved that this method was simple and practical.