Intertidal zone topographic survey
Taiwan, surrounded by sea, has vast territory of sea areas, of which the near-shore areas (including intertidal zones) are most often used yet suffer from dramatic topographic changes. The conventional land-based survey and vessel-based survey are hard to implement due to topographic factors and sea-surface conditions. As a result, not much data is available regarding the areas’ topography and scarce survey. New technologies have been sought, and many projects have been started since 2004. The NLSC has implemented “Pilot Project for Intertidal Zone Topographic Surveying and Mapping”, “Project for Intertidal Zone Topographic Surveying and Mapping along Changhua and Yunlin Areas” and “Project for the Development of Technology Applicable to Intertidal Zone Basic Topographic Survey”. The goal is to gradually build up near-shore topographic data along the Taiwan coastal area. As of the end of 2007, 62,500 hectares have been covered to supplement. In order to expand the application fields, the maps were transformed from CAD to GIS format from 2007 to 2011.