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A new approach to the reconstruction of contour lines ...
Thanks to the specific color of contour lines, their extraction from topographic maps can be done without more effort. After extracting the contour lines, gaps may occur because other features in topographic maps can overlay and cross the contour lines. Gaps cause problems for generation of DEM and construction of 3D simulation....
 A new framework for the extraction of contour lines in ...
A new framework for the extraction of contour lines in scanned topographic maps 5 3 Results The algorithm was tested on more than 50 scanned images of relatively complex topographic maps, with many colors and overlapping layers. Some of the scanned maps have a poor quality, being affected by noise caused mainly by the printing pro-...
Line separation from topographic maps using regional color ...
algorithm for topographic map segmentation[Chenet al., 2010]. This algorithm takes independent lines as the process-ing units, which breaks through the limitation of using single pixel as the basic processing unit in the traditional pixel-based methods. Based on this idea, in 2016, Liu et al. proposed an
Flow paths tracing from raster contours using distance ...
The use of contour lines makes the new method free from digitizing and interpolation errors, which are often caused in generating a grid DEM from a topographic map. The high availability of contour maps is another advantage of the new method. The method will benefit various hydrological analyses and applications....
Topography - Wikipedia
Digital Elevation Models, for example, have often been created not from new remote sensing data but from existing paper topographic maps. Many government and private publishers use the artwork (especially the contour lines) from existing topographic map sheets as the basis for their own specialized or updated topographic maps....
CN104331389A - Eight-point method-based contour-line ...
The invention discloses an eight-point method-based contour-line tracing algorithm. Topographical feature influence factors in reality are blended; when a contour line comes across an exit selection condition, eight-point method expansion and judgment can be carried out; after current regional topographical features are judged, tracking exit acceptation or rejection is carried out, so that the ......
Contour Line Recognition & Extraction from Scanned Colour ...
Abstract: Automatic separation of the different layers of information in maps poses an immense challenge due to the heavy interconnectedness of these layers. This process is further complicated by the problem of mixed color pixels and aliasing induced by the scanning process. In this paper we present a new semiautomatic method to extract contour lines from scanned color images of topographic maps....
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