conference paper

Take-Off and Landing Weight Estimation From ADS-B Airspeed Profiles

AIAA AVIATION FORUM AND ASCEND 2025

Publication Date

July 16, 2025

Author(s)

Marek Homola, Melissa Lepe, Marek Trávník, Jacqueline (Jacquie) Huynh, R. John Hansman

Abstract

Accurate estimation of aircraft takeoff weight (TOW) and landing weight (LW) is critical for assessing fuel consumption, emissions, noise impacts, and other analyses, yet these parameters are typically unavailable in surveillance data such as Automatic Dependent Surveillance-Broadcast (ADS-B). This study presents a method for estimating aircraft takeoff and landing weights using stabilized airspeed segments from ADS-B surveillance data. The approach is derived by relating lift, weight, and airspeed during stabilized flight phases. The method outlined is validated using one year of operations at Seattle-Tacoma International Airport, analyzing over 10,000 flights across three narrow-body aircraft types: B737-800, B737-900, and A320. Weight estimated from ADS-B airspeed profiles was matched to weight records provided by an airline, achieving mean absolute errors of 5.0–7.4% of maximum takeoff weight (MTOW) for departures and 6.0–7.0% of MTOW for arrivals. The method exhibits minimal systematic bias, with absolute distribution mean errors below 0.4% MTOW in magnitude. The demonstrated accuracy enables applications such as fleet-wide fuel consumption modeling, emissions inventories, and aircraft noise impact assessments, providing a valuable tool for data-driven modeling of aviation operations using existing surveillance infrastructure.

Suggested Citation
Marek Homola, Melissa Lepe, Marek Trávník, Jacqueline L. Huynh and R. John Hansman (2025) “Take-Off and Landing Weight Estimation From ADS-B Airspeed Profiles”, in AIAA AVIATION FORUM AND ASCEND 2025. American Institute of Aeronautics and Astronautics. Available at: https://arc.aiaa.org/doi/abs/10.2514/6.2025-3309 (Accessed: August 21, 2025).

published journal article

What Is the Connection? Understanding Shared Micromobility Links to Rail Public Transit Systems in Major California Cities

Sustainability

Publication Date

January 9, 2024

Author(s)

Mengying Ju, Elliot Martin, Susan Shaheen

Abstract

As shared micromobility (bikes and scooters) has proliferated throughout urban areas, there has been growing interest in how it facilitates connections with rail transit systems. This study explores the magnitude of interactions between shared micromobility and rail public transit systems using shared micromobility trip data and rail transit schedule data. We evaluate over one million trips from October 2019 to February 2020 in four California cities (San Francisco, Los Angeles, Sacramento, and San Jose) and develop criteria to identify trips connecting to rail transit. These include spatial and temporal rules, such as whether a trip starts/terminates close to public transit stations and whether a trip takes place when transit systems are operating. The criteria are examined via sensitivity analyses. The results indicate the degree of interaction between rail public transit and shared micromobility varies across cities and systems (i.e., docked/dockless). Most connections take place in the downtown or around public transit hubs. About 5–20% of all shared micromobility trips are identified as accessing or egressing from rail transit. These connecting trips exhibit commute-driven patterns and greater measured velocities. We conclude by examining the applicability of incorporating schedule information into the identification process of shared micromobility trips connecting to rail transit systems.

Suggested Citation
Mengying Ju, Elliot Martin and Susan Shaheen (2024) “What Is the Connection? Understanding Shared Micromobility Links to Rail Public Transit Systems in Major California Cities”, Sustainability, 16(2), p. 555. Available at: 10.3390/su16020555.

Phd Dissertation

Essays in urban economics

Publication Date

January 1, 2009

Author(s)

Abstract

Three independent research papers, all broadly focused on urban and transportation economics comprise the chapters of this dissertation. These empirical papers address a variety of policy oriented issues surrounding the automobile. Although related in theme, the objective, scope, and empirical strategy of each paper differs. The first chapter, “Does traffic congestion reduce employment growth?”, examines the impact of traffic congestion on employment growth in large U.S. metropolitan areas. I use an historic highway plan and political variables to serve as instruments for endogenous congestion. The results show that high initial levels of congestion dampen subsequent employment growth. This finding suggests that increasing the efficiency of public infrastructure can spur local economies. A set of counterfactual estimates show that the employment-growth returns from modest capacity expansion or congestion pricing are substantial. The second chapter, “Induced demand and rebound effects in road transport” (with Kenneth Small and Kurt Van Dender) uses a simultaneous equations model and aggregate data to estimate how drivers’ respond to exogenous increases in vehicle fuel-efficiency. One consequence of efficiency improvements is an increase vehicle use, which can moderate fuel savings. Accurate measures of this so-called ‘rebound effect’, are of interest to policy makers assessing the effectiveness of the Corporate Average Fuel Economy standards. This research paper also measures how traffic congestion and highway infrastructure affect vehicle use. The third chapter, “Evaluating the effectiveness of metered parking policy: evidence from a quasi-experiment”, uses a unique observational data set to assess metered parking policy. Although metered parking is ubiquitous, we know little about its effectiveness, particularly its impact on the retailers it is designed to assist. Sharp twice-daily changes in parking meter enforcement allow me to compare shopping behavior in both free and metered parking environments. Using the regression discontinuity design, I find that parking fees can have large impacts on nearby commerce.

Suggested Citation
Kent Matthew Hymel (2009) Essays in urban economics. Ph.D.. University of California, Irvine. Available at: https://uci.primo.exlibrisgroup.com/permalink/01CDL_IRV_INST/17uq3m8/alma991027750239704701 (Accessed: October 14, 2023).

presentation

Complete Street Composition - Infrastructural Improvements to Transportation Planning and Design in Orange County, California

Suggested Citation
Joseph Faria-Poynter (2022) “Complete Street Composition - Infrastructural Improvements to Transportation Planning and Design in Orange County, California”. 2022 ITS-Irvine Emerging Scholars Transportation Research Showcase, ITS-Irvine, 28 October. Available at: https://youtu.be/Rpdf6-T_fCk?t=1942.

policy brief

Charging-as-a-Service is an Innovative Business Model that Could Help with California’s Vehicle Electrification Goals

Abstract

Access to electric vehicle (EV) charging infrastructure is critical to advancing California’s EV adoption goals. The California Energy Commission has projected the state needs “nearly 1.2 million” chargers by 2030 “to meet the fueling demands of 7.5 million passenger plug-in electric vehicles.” Currently, California has about 152,000 publicly available EV chargers. Innovative asset ownership models, like charging-as-a-service (CaaS), could help overcome some of the barriers to deploying and maintaining charging infrastructure. For example, CaaS providers could procure, install, maintain, and replace charging equipment for subscription customers. To better understand how CaaS solutions could expand EV use and charging access, this researchers conducted semi-structured interviews with 13 CaaS companies, electric utilities, and customers to identify the perceptions, challenges, and opportunities of the CaaS business model in addressing charging station needs in California.

Suggested Citation
Angela Yun and Matthew D. Dean (2025) Charging-as-a-Service is an Innovative Business Model that Could Help with California’s Vehicle Electrification Goals. Policy Brief. UC ITS. Available at: https://doi.org/10.7922/g2tq5zw4.

research report

Review of “Bay Area/California high-speed rail ridership and revenue forecasting study”

Publication Date

January 1, 2010

Author(s)

David Brownstone, S. Madanat, M. Hansen
Suggested Citation
David Brownstone, S. Madanat and M. Hansen (2010) Review of “Bay Area/California high-speed rail ridership and revenue forecasting study”. California High Speed Rail Authority.

working paper

Predicting the Market Penetration of Electric and Clean-Fuel Vehicles

Publication Date

November 1, 1991

Author(s)

Thomas Golob, Ryuichi Kitamura, Mark Bradley, David Bunch

Abstract

Air quality in Southern California and elsewhere could be substantially improved if some gasoline powered personal vehicles were replaced by vehicles powered by electricity or alternative fuels, such as methanol, ethanol, propane, or compressed natural gas. Quantitative market research information about how consumers are likely to respond to alternative-fuel vehicles is critical to the development of policies aimed at encouraging such technological change. In 1991, a three-phase stated preference (SP) survey was implemented in the South Coast Air Basin of California to predict the effect on personal vehicle purchases of attributes that potentially differentiate clean-fuel vehicles from conventional gasoline (or diesel) vehicles. These attributes included: limited availability of refueling stations, limited range between refueling or recharging, vehicle prices, fuel operating costs, emissions levels, multiple-fuel capability, and performance. Respondents were asked to choose one vehicle from each of five sets of hypothetical clean-fuel and conventional gasoline vehicles, each vehicle defined in terms of attributes manipulated according to a specific experimental design. Discrete choice models, such as the multinomial logit model, are then used to estimate how the values of the attribute levels influence purchase decisions. The SP survey choice sets were customized to each respondent’s situation, as determined in the preceding Phase of the survey. The final Phase of the survey involved fuel-choice SP tasks for multi-fuel vehicles that can run on either clean fuels or gasoline. Preliminary results from a pilot sample indicate that the survey responses are plausible and will indeed be useful for forecasting.

Suggested Citation
Thomas F. Golob, Ryuichi Kitamura, Mark Bradley and David S. Bunch (1991) Predicting the Market Penetration of Electric and Clean-Fuel Vehicles. Working Paper UCI-ITS-WP-91-13. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/9jc2n56h.

published journal article

Avoiding the risk of responsibility by seeking uncertainty: Responsibility aversion and preference for indirect agency when choosing for others

Journal of Consumer Psychology

Publication Date

October 1, 2011

Author(s)

James M. Leonhardt, Robin Keller, Cornelia Pechmann
Suggested Citation
James M. Leonhardt, L. Robin Keller and Cornelia Pechmann (2011) “Avoiding the risk of responsibility by seeking uncertainty: Responsibility aversion and preference for indirect agency when choosing for others”, Journal of Consumer Psychology, 21(4), pp. 405–413. Available at: 10.1016/j.jcps.2011.01.001.

working paper

An Activity-Based Microsimulation Model for Generating Synthetic Activity-Travel Patterns: Initial Results

Publication Date

December 1, 2000

Working Paper

UCI-ITS-WP-00-15, UCI-ITS-AS-WP-00-3

Areas of Expertise

Abstract

This paper describes the development of SIMAP, an activity-based microsimulation model for travel demand forecasting, and is part of a larger research effort aimed at the development of innovative transportation planning methodologies designed to address the limitations of current modeling practice in meeting current legislative and judicial mandates. The model builds upon existing research demonstrating that travel behavior should be viewed holistically using activity-travel patterns, a time-dependent representation of the activities and their attributes in which an individual engages. A microsimulation approach integrated with a geographic information system is advanced to synthesize individual, 24-hour activity-travel patterns for households that are reflective of the available transportation and land use system. By using activity-travel patterns as the basis of the SIMAP, the timing, sequencing, and connections between activities are explicitly included in the model where previously they would be disregarded. The final product of this research is  a prototype modeling system that has the potential to replace some or all aspects of the traditional ‘four-step’ modeling process. The next section describes the specifics of SIMAP. Section 3 presents a short discussion of the aggregate activity-travel pattern classification and results. Section 4 summarizes the implementation of the generation model, while Section 5 demonstrates a limited application of SIMAP. Finally, Section 6 concludes this paper by describing how this project’s key contribution and suggests some extensions to the work.

Suggested Citation
Anup A. Kulkarni and Michael G. McNally (2000) An Activity-Based Microsimulation Model for Generating Synthetic Activity-Travel Patterns: Initial Results. Working Paper UCI-ITS-WP-00-15, UCI-ITS-AS-WP-00-3. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/2d958342.

conference paper

A machine learning approach for localization in cellular environments

2018 IEEE/ION position, location and navigation symposium (PLANS)

Publication Date

April 1, 2018

Author(s)

Ali Abdallah, Samer S. Saab, Zaher Kassas
Suggested Citation
Ali A. Abdallah, Samer S. Saab and Zaher M. Kassas (2018) “A machine learning approach for localization in cellular environments”, in 2018 IEEE/ION position, location and navigation symposium (PLANS). IEEE, pp. 1223–1227. Available at: 10.1109/plans.2018.8373508.