当前位置: X-MOL 学术Journal of Transport and Land Use › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A new method using medians to calibrate single-parameter spatial interaction models
Journal of Transport and Land Use ( IF 1.6 ) Pub Date : 2020-01-28 , DOI: 10.5198/jtlu.2020.1614
Louis A Merlin

I present a method for calibrating the impedance parameter of a gravity spatial interaction model using only the median travel time as a measure of observed traveler behavior. Complete information about the spatial structure of origins, destinations, and travel times between origins and destinations is also required. Using Monte Carlo simulation techniques on stylized cities, I attempt to recover true (a priori known) impedance values with this method for a range of impedance values for both negative exponential and power impedance functions. The results are compared with estimates obtained by other fast methods. The proposed method proves to provide a fairly accurate estimate of the impedance parameter, with a mean percent error typically below 20% and often below 10% for common impedance values. The proposed method is an improvement over existing calibration methods in several respects. First, it allows for the estimation of the impedance parameter directly without lengthy iterative calculations. Second, because it only requires median travel times, it can be calibrated with smaller samples (n~200), allowing the construction of gravity models for specific modes and/or travel purposes. And third, the method does not require expensive travel demand software and so can be implemented more widely in practice.

中文翻译:

使用中位数校准单参数空间相互作用模型的新方法

我提出了一种仅使用中位旅行时间作为对观察到的旅行者行为的度量来校准重力空间相互作用模型的阻抗参数的方法。还需要有关出发地,目的地的空间结构以及出发地与目的地之间的旅行时间的完整信息。通过在风格化城市上使用蒙特卡罗模拟技术,我尝试使用此方法针对负指数和功率阻抗函数的一系列阻抗值恢复真实(先验已知)阻抗值。将结果与通过其他快速方法获得的估计值进行比较。所提出的方法证明可以提供阻抗参数的相当准确的估计,对于常见的阻抗值,平均误差百分比通常低于20%,通常低于10%。所提出的方法在几个方面是对现有校准方法的改进。首先,它无需直接进行冗长的迭代计算即可直接估算阻抗参数。其次,由于只需要中途旅行时间,因此可以用较小的样本(n〜200)进行校准,从而可以为特定模式和/或旅行目的构建重力模型。第三,该方法不需要昂贵的旅行需求软件,因此可以在实践中更广泛地实施。允许针对特定模式和/或行驶目的构建重力模型。第三,该方法不需要昂贵的旅行需求软件,因此可以在实践中更广泛地实施。允许针对特定模式和/或行驶目的构建重力模型。第三,该方法不需要昂贵的旅行需求软件,因此可以在实践中更广泛地实施。
更新日期:2020-01-28
down
wechat
bug