本研究之目的為探討空間型構指標應用於判斷道路層級之適用性，經由對於指標的篩選與參數設定的測試，建立系統性道路層級辨識程序，對於實際路網進行分級實證。在現今的規劃中，道路層級分級方式較為簡易，一般常用的分級依據如路寬、流量、長度等，分級結果相較主觀。故本研究試圖從路網構型的角度切入，量測各路段在路網結構中的連接重要性作為分級依據。空間型構法則以軸線圖作為量測線型空間之工具，納入不同種類軸線類型、運算指標、半徑設定等變化，提供每個量測單元精確的數值。結果顯示在以英國米爾頓凱恩斯建立的模型測試中，半徑與路網規模對於量測結果有很大影響，分析尺度的差異會產生不同辨識成果，也代表在相同道路在社區到全市尺度間，被賦予不同的機能定位。本研究進而建立排序標準化方法，將數值高低相對高低意義轉為在路網中位置絕對意義，得以進行跨尺度跨圖之比較，進而建立道路層級辨識系統。以臺南安平五期重劃區路網案例進行實證時，量測結果並未明顯受到尺度影響，造成結果之原因為高層級道路與過多低層級道路直接相連，取代了部分低層級道路在小尺度中的功能；部分低層級道路連貫性過高，也取代了原先高層級道路被賦予的功能，使得層級間跨尺度的分工較為不明確。本研究之成果能夠在技術面提供後續研究量測基礎；在應用面提供實務規劃改善依據。

The aim of this study is to examine the parameter combinations and establish the road hierarchy measuring system by applying space syntax. Currently the road classification process in physical planning is fairly intuitive and subjective, measuring based on the traffic engineering characteristics such as width and length of roads, traffic volumes, accessibilities and mobilities. The present study attempts to categorize roads into different levels according to road structure, i.e. connections between road segments in the networks. Axial line is one of the tools in space syntax to represent connecting characteristics of linear spaces. The values of each axial line were estimated by using different combinations of measures, radii, graph boundaries and axial line types for seeking better settings. A model using the road networks of Milton Keynes, UK as the template was developed to investigate the relationships between the values of axial lines and road hierarchy. The results show that radii and graph boundaries are the main parameters which show the role in different scale of the networks. In other words, each road have their own characteristic in both local scale and city scale. The present study establishes the standardized index showing absolute value of the road hierarchy in the network. Thus, a road hierarchy categorizing process was built. The empirical analysis results using the networks of An-Ping district in Tainan makes a difference from the model. The results are nearly the same in different scales. The reason is that higher level roads connect too much lower level roads and get a strong connectivity in small scale. On the other hand, lower level roads have high continuity and get a higher value after they are connected with planning, and the value may even be equal to the value of higher level roads. The functions in different level of roads are mutually exclusive. The results of this present study might be able to provide suggestions for the planning authorities, while the approaches used in this study might be the foundation for further studies.

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