Digital Orthographic Map (DOM)
Digital Orthographic Map (DOM) are aerial or satellite photography that have been corrected so that its pixels are aligned with longitude and latitude lines, and have a narrowly defined region of coverage.
DOM can be used in various applications because it contains both image features and terrain information.
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Digital Elevation Model (DEM)
Digital Elevation Models are data files that contain the elevation of the terrain over a specified area, usually at a fixed grid interval over the surface of the earth. The intervals between each of the grid points will always be referenced so some geographical coordinate system. The closer together the grid points are located, the more detailed the information will be in the file. |
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Digital Line Graphic (DLG)
Digital Line Graphic (DLG) data are digital representations of cartographic information. The map features of DLG are digital vectors converted from maps and related sources. |
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Digital Raster Graphic (DRG)
A digital raster graphic (DRG) is a scanned image of topographic map. The scanned image includes all map collar information. The image inside the map neatline is georeferenced to the surface of the Earth. The DRG can be used to collect, review, and revise other digital data, especially digital line graphic (DLG). When the DRG is combined with other digital products, such as digital orthographic map (DOM) or digital elevation models (DEM), the resulting image provides additional visual information for the extraction and revision of base cartographic information. |
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Land Use Dynamic Monitoring
Land Use Dynamic Monitoring employs 3S (GPS,GIS,RS) technology. When the land use type of a land parcel is changed, the data updating can be made by changing its land type ID in the attribute table in a GIS. When a land use type of an irregular area is changed, GPS receivers are used to position its border. The technology enjoys advantages of high accruacy and low expenses. The system captures the information of land use change timely and can be usedto dynamically monitor the land use.
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Land Use Database
The objective of the National Land Use Database (NLUD) is to develop a complete, consistent and detailed geographical record of land use. The database is kept up-to-date and the information of land use can be delivered to users to meet their business requirements. |
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Town Cadastral Database (or Digital Cadastral Database)
The Digital Cadastral Database (DCDB) is essentially a computerized map of property boundaries and the related property description of all land parcels. It is ideal base for searching, planning and analyzing land related-information. |
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Land Use Planning Database
Land use planning
ensures the use of land resources in an organized fashion so that the needs of the present and future generations can be best addressed. Land use planning has as its basic purpose to ensure that each area of land will be used so as to provide maximum social benefits, especially including food production, without degradation of the land resource. |
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LiDAR Technology
Light
Detection and Ranging (LiDAR) is a remote sensing system used to collect topographic data. The systems emit pulses of laser light and precisely measure the elapsed time for a reflection to return from the ground below. Knowing the speed of light and the elapsed time, the distance to the target can be calculated.
The applications of LiDAR technology include:
(1) Topographic surveying
(2)
4D products
(3) Power lines、railway、highway surveying
(4) Forest resource management
(5) 3D city models
(6) Risk management (flood、earthquake、tsunami) |
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