Airborne Bathymetric LiDAR
Bathymetric lidar systems utilize green laser, which can penetrate water and scatter on the sea floor, to collect shallow water depths. Comparing with sonar based sounding technology, airborne laser hydrography is featured with high efficiency and particularly suitable for areas with shoals and other risks for boat navigation. Equipped with an AHAB Hawkeye II lidar system installed on a SA-226T aircraft, a survey was conducted in August and September of 2010. The survey area is about 500 square kilometers for Dongsha, and about 415 square kilometers for Penghu. The data collected will be used for both scientific and regional planning studies.
Deformation Analysis of Taiwan e-GPS Base Stations
The island of Taiwan is located at the junction between the Eurasian and Philippine plates, which leads to frequent earthquakes. Therefore, using GPS base station monitoring on disaster prevention is quite important. Compared with the current relative positioning, Precise Point Positioning (PPP) refers to absolute positioning and it can also operate without restrictions such as using the base stations and local coordinate system. In consequence, this study analyzes the deformation of Taiwan e-GPS base stations, which was built by National Land Surveying and mapping Center (NLSC), in International Terrestrial Reference Frame. By using the result of e-GPS station coordinates as comparison value, further experiments assess the accuracy of automated CSRS-PPP online positioning service.
Geological Geographic Information System (GGIS)
DPWE has finished the two tasks during 2004 and 2008: (1) development of basic geological database framework, and (2) data collection and verification for the river basins administered by the central government. The GGIS serves as a geologic information platform for river basins. Projects are being carried out to study the geologic characteristics of river basins and their affects on the river management and planning.
Auto-generated Geological Maps System
This study aims to investigate the possibility to generate geological maps by the Kriging method. The construction of a geological model makes use of bedding information including orientations data from outcrops and rock-cores. From the DTM and the geological model, it is then possible to obtain the geologic boundaries (or contact lines), and to draw a geological map or profile. The presented method is found reasonable for modeling outcrop trace of geologic formations. Except the outcrop trace, the Kriging method also provides the estimated error variance.
Automatic Monitoring Information System
DPWE developed the transmission line based (fiber optic and TDR) monitoring techniques with automation approaches for requirements of real time acquisition, communication and analysis. These achievements are integrated to an automation monitoring information system, capable of in-situ monitoring in fields of geotechnical, hydrology, and water environment engineering.
Land Subsidence Geographic Information System
Through the geographic information system (GIS), the subsurface hydrology model, regional layered land subsidence model, and the groundwater management model were integrated to determine the groundwater movement, land subsidence distribution, and optimum pumping strategy.