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Map labels used to identify various features and objects are a fundamental part of producing good graphs and maps. It is essential that map labels be placed in a clear and unobscured manner. Label placement is a fundamental part of producing good maps and essential item to communicate spatial information. There are three types of features that need to be labeled: point features, linear features and...
Building models and model mesh simplification multiresolution storage mechanism is the key for three-dimensional navigation widely used. This paper proposed a mesh simplification and multiresolution storage compression algorithm based on the model of edge collapse operations. First of all, it used an artificial interact method to set the protected feature points and grids and updated a series of partial...
Displaying map data at scales smaller than its source can result in objects that are either too small to be seen or too close to each other to be distinguishable. Furthermore, map conflicts become more likely when certain map symbols are no longer a true scale representation of the feature they represent. Map generalization involves careful examination of the interactions between all map symbols....
Nowadays spatial relationships are widely used in more and more aspects in Geographic Information System. However, in the process of spatial database updating, due to updating period inconsistent of spatial objects, there often lead to spatial conflicts. In addition, in the field of computer cartography, map data are usually derived from a source that is based on a particular scale of representation...
Geomorphologic elements such as valley, ridge are structural information to represent natural geomorphology in spatial extension and distribution. The united Delaunay triangulation network methodology makes an improvement over traditional triangulation method, with its capability of detecting human recognizable bends. Although this united Delaunay triangulation network is more suitable for terrain...
This paper proposes a novel approach of selective omission for streets based on mesh density. For meshes with density over threshold, the largest density meshes are taken out by turns and one road segment of them is eliminated. Meanwhile the taken mesh is merged with the adjacent mesh at a time. Road segment to be eliminated is the most unimportant in all segments on the boundary of this mesh according...
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