等高线

On the basis of brief introduction to fundamental theory of FD8, a new algorithm to accurately calculate the effective contour length in the accumulated flow partitioning involved in 1n computation by using internal tangent circle on conical surface method was proposed.

本文首先介绍了多流向算法的基本原理，并基于此对流动累积分配中的有效等高线长度精确计算提出了几何锥面内切圆算法，同时改进了传统的地形指数中单位等高线汇流面积α的计算方法，增强了多流向算法对DEM中异常栅格的处理能力。

The advanced method about tracing contour line was used to draw the contour...

采用先进的等高线追踪方法，提高了绘制等高线的准确性，解决了等高点即格网点的情况； 2 基于OpenGL地形的三维可视化。

To read the contour map, people must understand the relationship between the terrain and the contour map, including the change of gradient and depth of space.

而阅读等高线图首重要先了解地形与等高线图的关系，其中包含坡形的变化及空间深度变化。

And a kind of contour map representing pollution degree was obtained, by which it can be known about the pollution situation of whole water area.

并用此方法对太湖水污染情况进行分析，给出了一种污染指数的定义，计算出污染程度等高线，据此等高线图可以从宏观上了解整个水域的污染情况。

Compared with traditional DEM or TIN based methods, this pure vector approach obtains not only the topological structure of drainage system in planar graph, but also the valley distribution polygon range. Depending on geometrical computation and judgment of vector line, polygon, the structured properties in drainage representation is enhanced, avoiding the case of noise disturbance in DEM based method. The core algorithm makes use of the ability of Delaunay triangulation in detecting hierarchical structure of each contour line.

中文摘要：基于Delaunay三角网模型在矢量等高线基础上通过弯曲特征分析，给出了一种地形结构特征提取及谷地树组织的方法，与传统的基于DEM或TIN数据结构提取地形特征的方法相比，该方法不仅得到了谷地系统在平面图上的拓扑结构，还获得了河谷在空间分布上的汇水范围，依托矢量线、多边形的几何关系判断，增强了谷地树组织中的结构化，避免了DEM方法中的噪音干扰，方法的核心是Delaunay三角网在单根等高线弯曲深度表达上的层次结构识别。

In order to overcome them, another simple but highly effective method is proposed in this paper. This method is based on mechanical model of spline function. The principle is that the vertical displacements of elastic lamella grids the elevation of land key points. Consequently we can use the finite element method to draw contours accurately.

为了克服这些现象，提出了一种根据地形特征点自动绘制等高线的高效、简便、实用的新方法，其基本思想是建立在样条函数的力学模型基础上，利用弹性薄板的竖向位移比拟地形特征点的标高，从而利用有限元，高精度地绘制出等高线。

As a result, many detailed analysis results were obtained, including pressure contour line nephogram and velocity vector contour line nephogram.

得到了详尽的分析结果，包括压力等高线云图、速度矢量等高线云图等。

A contour tree has found many important applications in map generalization,terrain analysis,etc.with respect to generating contour tree,this paper has proposed a scan-line based method,this method translates intersection point pair of scan-line and contour line as range,explains containment relation between range as containment relation between contour lines,determines "one-many" direct containment relations between parent contour and child contour by this method.

中国科学院计算所，北京 100080摘要等高线树在地图的产生、地形分析等应用中具有较重要的应用。对于产生等高线树，提出了一种基于扫描线的方法，该方法把扫描线和等高线之间的交点对解释为区域，利用区域之间的包含关系对应等高线之间的包含关系，以这种方式来确定父等高线与子等高线之间的"一对多"直接包含关系。

The paleo structural contour map restored by concept of "balance in geology" might be more reasonable to depict the 3 D structural geometry in the geological epochs than the map compiled by utilizing the thickness of relict strata.

运用"地质平衡"概念编制的古构造等高线图比传统的只用地层残余厚度编制的古构造等高线图能更合理地反映地质时期的盆地古构造三维几何特征。

From the development and present status of automatic mapping contour maps, we know that the technology of automatic mapping contour maps which contains faults especially cross bedded faults was developed slowly, which are part of contour maps. In the process of our factual work, the phenomenon of half-handcraft mapping contour maps containing singular and cross-bedded faults is ubiquitous.

从等高线图自动绘制的发展历史及现状可以看出，断层等高线图是平面等高线图的一部分，含断层等高线图的自动绘制，尤其是带交叉断层等高线图的自动绘制技术发展缓慢，半手工绘制单一断层和交叉断层的等高线图的现象还普遍存在。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。