基于面积分界尺度的居民地轮廓化简

分析常用的利用宽度和深度分界尺度进行面状居民地轮廓化简方法中存在的不足,提出基于面积分界尺度的居民地轮廓化简。即首先根据面状居民地的轮廓特征对居民地数据进行预处理,删除其中的冗余数据;然后,通过计算居民地弯曲部分构成的平行四边形的面积判断弯曲部分是否进行化简,并利用对边线的求交进行居民地图形轮廓的化简;最后,通过对实际面状居民地数据的化简实验验证文中方法的有效性和可操作性。

关于立体测图综合取舍的初步探讨

本文论述了航测成图中制图综合取舍的一般原则和方法，提出了分界尺度的概念，并对它进行了定性定量的分析。着重介绍了立体测绘综合取舍的理论及方法。并对几种地物的综合过程作了实例介绍。最后讲述了制图综合在未来全数字化测图中占据的位置。

An innovative method to calculate oxygen consumption rate

Based on heat and mass transfer characteristics of spontaneous combustion of coal,Arrhenius equation and the Ranz-Marshall correlation,a novel approach was proposed in this paper to estimate oxygen consumption rate of self-ignition of coal at high temperature.Compared with the conventional methods,this approach involves not only kinetic properties of self-ignition of coal and temperature,but also the ambient air flow characteristics and diameter of coal particle.To testify the proposed approach,oxygen consumption rates at high temperature were measured by the programmable isothermal oven experiments.Comparisons between experimental and theoretical results indicate that the rates of oxygen depletion calculated by the proposed approach agree well with those measured from laboratory-scale experiments,which further validates the proposed approach.

面向制图的GlobeLand30数据小图斑综合方法

针对当前的小图斑综合方法无法满足基于GlobeLand30数据制作地表景观图需要的问题,该文通过建立变化分界尺度计算模型、改进图斑处理方法,并基于层次格网划分综合区进行小图斑综合,最后将此方法应用于郑州市地区地表覆盖数据的综合并生成了地表景观图。实验结果表明,该方法在保持地表覆盖的整体结构特征和各类型地表覆盖的空间分布特征方面效果显著。