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High Resolution 1:10,000 scale Mapping Strategy of Multi ... - NDMA

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DWG, SVC, and ASV.<br />

In order to complement the mapping functions that are included in GIS and<br />

other mapping and data processing s<strong>of</strong>tware, vector data is used to facilitate the<br />

visualization <strong>of</strong> surface and subsurface features. The image acquisition process<br />

generates the initial raster image at a certain spatial resolution.<br />

To ensure that the vector data, which might be extracted from digital satellite<br />

images, aerial photo mosaics, or digital map data, is free <strong>of</strong> any coordinate<br />

ambiguities outside <strong>of</strong> the project specifications, the satellite image data or digital<br />

aerial photography is orthorectified. Topographic, geological, and any other source<br />

map data is also rectified, using 75 to <strong>10</strong>0 percent <strong>of</strong> the grid ticks available on the<br />

maps.<br />

Additionally, vector data can be merged with 3D terrain visualization mapping<br />

environments, such as those which use ESRI's ArcGIS s<strong>of</strong>tware with the 3D Analyst<br />

module. The 3D terrain flythrough scenes with vector data are produced in standard<br />

video formats, such as AVI and WMV.<br />

The final vector data can be provided in a variety <strong>of</strong> formats, such as<br />

AutoCAD, DWG/DXF, SVG, ASV, ESRI shape files, or standard ASCII X/Y/Z, and<br />

referenced to a specified survey datum and mapping projection.<br />

74

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