1.长沙理工大学交通运输工程学院,湖南 长沙,410114
2.长沙理工大学公路地质灾变预警空间信息技术湖南省工程实验室,湖南 长沙,410114
赵彬彬,博士,副教授,主要从事地理数据不一致性探测处理的理论与方法等研究。zbbsir@163.com
谢建湘,硕士,工程师。15111425585@163.com
收稿:2023-02-10,
纸质出版:2025-01-05
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赵彬彬,谢建湘,张宏奎,等.运用Morphing变换提取地性线算法研究[J].武汉大学学报(信息科学版),2025,50(1):174-183.
ZHAO Binbin,XIE Jianxiang,ZHANG Hongkui,et al.Geographic Line Extraction Algorithm Based on Morphing Transformation Techniques[J].Geomatics and Information Science of Wuhan University,2025,50(1):174-183.
赵彬彬,谢建湘,张宏奎,等.运用Morphing变换提取地性线算法研究[J].武汉大学学报(信息科学版),2025,50(1):174-183. DOI:10.13203/j.whugis20220493
ZHAO Binbin,XIE Jianxiang,ZHANG Hongkui,et al.Geographic Line Extraction Algorithm Based on Morphing Transformation Techniques[J].Geomatics and Information Science of Wuhan University,2025,50(1):174-183. DOI:10.13203/j.whugis20220493
由等高线获取山谷(脊)线对地形分析、坡度坡向计算和库区设计等应用具有重要的现实意义和非常高的生产价值。当前,面向等高线的地性线提取大多采用特征点连接法,其提取的地性线易与等高线发生空间逻辑冲突,在等高线弯曲形状较多变、较复杂的区域,所获取的山谷(脊)线存在与等高线弯曲特征不符且偏离较严重等问题。因此,依据地理学第一定律分析了等高线整体形态及局部形状特征,基于Morphing变换技术,提出了一种兼顾地性线两侧等高线形状特征,同时顾及山谷(脊)特征点位置约束的地性线提取新方法。首先,凭借各等高线的高程及其层次关系构建等高线树,并根据等高线上节点凹凸属性进行等高线弯曲分割,以高效准确地提取地形特征点;然后,以地形特征点为界构建其两侧等高线各节点之间的极优映射关系;最后,以地形特征点为约束,采用基于渐变移位距离值的Morphing变换提取地性线。实验结果表明,该方法能准确地提取出完整的与实际地形相吻合亦兼顾等高线整体形态与走势的地性线。
Objectives
2
Obtaining valley (ridge) lines from contour data has important practical significance and high production value for terrain analysis
slope aspect calculation and reservoir area designing. In view of the fact that current contour-oriented geographic lines extraction mostly adopts feature point direct-connecting method
and the extracted geographic lines are prone to spatial logical conflicts with contour lines. Meantime
in areas where the contour lines are more curved and more complex
the extracted valley (ridge) line does not conform to the bending characteristics of contour lines
and even deviates dramatically in certain local areas.
Methods
2
Therefore
after overall shape and local shape characteristics of the contour line are analyzed sufficiently based on Tobler's first law
a novel methodology of extracting geographic lines from contour data based on Morphing transformation techniques is proposed
which takes the contour line on both sides of a valley (ridge) into consideration
as well as constraint of feature points’ location. First
a contour tree is constructed based on the elevation and hierarchical relationship of contours
and the contour curve segmentation is carried out according to the concave and convex attributes of nodes on the contour line. Then
the terrain feature points are extracted efficiently and accurately. Second
each contour line is split into two parts with the terrain feature points
whereafter
an optimal correspondence of the nodes on both parts of a contour line are computed. Third
with respect to the constraints of terrain feature points
the geographic lines are extracted by performing Morphing transformation with a gradient shifting distance value.
Results
2
The experimental results show that the methodology extracts complete geographic lines accurately
which are consistent with the actual terrain and take into account the overall shape and trend of contour lines.
Conclusions
2
The geographic lines extraction based on Morphing transformation techniques method can take into account the overall shape and trend of contour lines and unique shape at feature points to extract complete geographic lines consistent with the actual terrain
and it is robust. When the local terrain changes are complex
the contour shape is also complex. At this time
the allocation of Morphing transformation value for parameter
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2.79399991
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1.26999998
considering more factors will be involved
which is also the content to be further studied in the follow-up work.
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