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Digital Terrain Model

        Digital Terrain(Surface) Model is the basis of major national constructions. Such as the remote sensing satellite image rectification, the decision-making and management of water resources, the application of hydrological modeling, the flooded mode analysis of flood overflow areas, engineering design and planning, flight safety management.An accurate and detailed digital terrain data is needed. During 2004 to 2006, the Ministry of the Interior completed the Digital Elevation Model (DEM) and Digital Surface Model (DSM) in 5-meter-resolution. In order to continue the results of "High-precision and high-resolution digital terrain model implementation plan", the Ministry of the Interior developed an extending project which working period ranges from 2006 to 2009. The works of the project are as follows:

  1. Compiling regulation, developing the mechanism for maintaining, updating, managing and revising the DTM data.

  2. Developing relevant technology and system for high-precision rectification of ortho imagery.

  3. Developing LIDAR surveying and mapping technology.

  4. Introducing water-permeable LIDAR surveying and mapping technology.

  5. Developing ground-based three-dimensional laser surveying technology.

  6. Conduct the plan to deploy photogrammetry landmarks and build nature and artificial point feature database.

  7. Developing relevant technology of 3D city models. 

        Due to the different surveying and production method, data format, and quality standard of DTM, MOI is dedicated to the integration of DTM productions from all organizations and development specification for integration and applications.

        In 2009, typhoon Morakot caused severe damage to infrastructures, property and human lives in southern Taiwan. Consequently the airborne LiDAR survey was carried out from 2010 to 2015 by Central Geological Survey of the Ministry of Economic Affairs in Taiwan to produce 1m x 1m high resolution DEM and aerial ortho-photo images in order to build up post-disaster high resolution DEM database and apply to such as investigate and analysis for geologically sensitive areas, Geological and Topography characteristics, Potential geological disaster, River system analysis.

Central Geological Survey

Central Geological Survey"s annual management scope

        In order to continuously update the DTM maps in Taiwan, the Ministry of the Interior, referring to the experience of the Central Geological Survey planning for adoption of sub-year to update DTM data with LiDAR technology.

DTM updating areas of MOI from 2016 to 2018

DTM updating areas of MOI from 2016 to 2018