Verifying and improving map specifications of river network selection for automatic generalization of small-scale maps

Iga Ajdacka, I. Karsznia
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引用次数: 1

Abstract

Abstract Automated generalization is highly desired for effective map production. This research focuses on the initial stage of generalization, namely object selection. The study aims to conduct river network automatic selection based on map specifications contained in the Minister of Internal Affairs and Administration regulation. The research covers river network selection from the General Geographic Objects Database from 1:250,000 to 1:500,000 detail level. Within the research scope, three selection variants were designed. The first was a basic variant that only included the implementation of the specifications contained in the regulation. The other two were experimental variants: an extended variant and an extended-modified variant with the parameters and data enrichment proposed by the authors. The extended variant has been supplemented with the Id_MPHP index usage, derived from the Map of Hydrographic Division of Poland (MPHP), which defines the hierarchy of watercourses in the river network. The extended-modified variant was implemented according to the guidelines of the regulation, with the use of the Id_MPHP index and additionally with the help of the parameter denoting “priority” watercourses, which was assigned by the authors. The results of the work constitute the generalization models designed in ArcMap 10.8. with the use of Model Builder functionality as well as the maps presenting the selection variants output visualizations. The results were compared visually as well as verified with the reference atlas map generalized by an experienced cartographer. As a result, the map specifications concerning the selection process presented in the regulation proved to be insufficient to generalize river networks properly. The variants proposed in this research made it possible to improve the selection results and enabled the automation of the river selection process. Additional specifications and parameters proposed in this work may constitute an essential supplement to the guidelines contained in the regulation.
验证和改进小比例尺地图自动综合河网选择的地图规范
为了有效地制作地图,自动化综合是非常必要的。本研究的重点是泛化的初始阶段,即对象选择。该研究的目的是根据内务行政长官规章中包含的地图规范进行河网自动选择。该研究涵盖了从通用地理对象数据库中选择1:25万至1:50万细节级别的河网。在研究范围内,设计了三种选择变量。第一种是一种基本的变体,它只包括执行规则中包含的规范。另外两个是实验变体:一个扩展变体和一个扩展修改变体,具有作者提出的参数和数据充实。扩展后的变体补充了Id_MPHP索引用法,该索引取自《波兰水文划分图》(MPHP),该地图定义了河网中的水道等级。根据规则的指导方针,使用Id_MPHP索引,并借助作者指定的表示“优先”水道的参数,实现了扩展修改的变体。研究结果构成了arcmap10.8中设计的概化模型。使用模型生成器功能以及呈现选择变量输出可视化的地图。结果与经验丰富的制图师绘制的参考地图集图进行了直观对比和验证。结果证明,条例中有关选择过程的地图规范不足以适当地概括河网。本研究提出的变量可以改善选择结果,并实现河流选择过程的自动化。本工作中提出的其他规范和参数可能构成对法规中所含指南的重要补充。
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