The performance of electron beam is firmly associated with shape for electron beam stream which reflects its focus state. With contour map algorithm various power distribution regions were segmented by multi-level power density value sets. Based on iterating policy the power density value was computed by specialized power region value. The theory was analyzed and algorithm steps were depicted i...

Contour lines are important for quantitatively displaying relief and identifying morphometric features on a map. Contour trees are often used to represent spatial relationships between contours and assist the user in analysing the terrain. However, automatic analysis from the contour tree is still limited as features identified on a map by sets of contours are not only characterised by local re...

In GIS system, we often use vector contour map to show or locate position on the earth. Since such map data is very worthy of value, it is necessary and important to protect its copyright. In this paper, we propose a new method to embed watermark into the angle parameter of polygonal lines or curves in a contour map after its parameterization. The watermark can be detected as proof of the owner...

Some applications such as the autonomous navigation in natural terrain and the automation of map making process require high-level scene descriptions as well as geometrical representation of the natural terrain environments. In this paper, we present methods for building high level terrain descriptions, referred as topographic maps, by extracting terrain features like "peaks", "pits", "ridges",...

A new algorithm for reconstructing contour map from raster DEM data is presented. It runs completely within the programmable 3D visualization pipeline in real-time. During the rendering, we first make an elevation gradient map out of original terrain vertex data. Then figure out the final contour lines with image-space processing, and blend the values on the original scene to obtain the final s...

Terrain relief is an important feature of geographic environment and a major element of topographic maps. Contour lines are widely adopted as representation of terrain relief in traditional maps. In general, contour maps are still indispensable due to the following reasons: 1) Abundant terrain data are still represented by contour maps; 2) Contour maps contain fewer limits for use in different ...

Earlier studies have suggested that proficient map readers employ cognitive strategies such as information chunking and schemas to aid information processing. In this paper experienced and non-experienced map readers studied and reproduced firstly a town map and then a topographical map. No group differences were observed for the town map task. When the topographical map was recalled the expert...

A map visually enfolds selected messages to a target audience. To achieve this effectively, a clear understanding of ‘the message, the user and the purpose’ of the map needs to be translated into successful design choices covering content, typography, style and layout. Aesthetics not only inform the local design space over which rules for visual mappings are defined, but they also offer global ...