TCRP Report on Equity 25860

Total Page:16

File Type:pdf, Size:1020Kb

TCRP Report on Equity 25860 THE NATIONAL ACADEMIES PRESS This PDF is available at http://nap.edu/25860 SHARE Equity Analysis in Regional Transportation Planning Processes, Volume 1: Guide (2020) DETAILS 130 pages | 8.5 x 11 | PAPERBACK ISBN 978-0-309-68020-2 | DOI 10.17226/25860 CONTRIBUTORS GET THIS BOOK ICF Hannah Twaddell and ICF Beth Zgoda; Transit Cooperative Research Program; Transportation Research Board; National Academies of Sciences, Engineering, and Medicine FIND RELATED TITLES SUGGESTED CITATION National Academies of Sciences, Engineering, and Medicine 2020. Equity Analysis in Regional Transportation Planning Processes, Volume 1: Guide. Washington, DC: The National Academies Press. https://doi.org/10.17226/25860. Visit the National Academies Press at NAP.edu and login or register to get: – Access to free PDF downloads of thousands of scientific reports – 10% off the price of print titles – Email or social media notifications of new titles related to your interests – Special offers and discounts Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the National Academies Press. (Request Permission) Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved. Equity Analysis in Regional Transportation Planning Processes, Volume 1: Guide TRANSIT COOPERATIVE RESEARCH PROGRAM TCRP RESEARCH REPORT 214 Equity Analysis in Regional Transportation Planning Processes Volume 1: Guide Hannah Twaddell ICF Charlottesville, VA and Beth Zgoda ICF Washington, DC Subject Areas Public Transportation • Planning and Forecasting • Policy Research sponsored by the Federal Transit Administration in cooperation with the Transit Development Corporation 2020 Copyright National Academy of Sciences. All rights reserved. Equity Analysis in Regional Transportation Planning Processes, Volume 1: Guide TRANSIT COOPERATIVE RESEARCH PROGRAM TCRP RESEARCH REPORT 214, VOLUME 1 The nation’s growth and the need to meet mobility, environmental, Project H-54 and energy objectives place demands on public transit systems. Cur- ISSN 2572-3782 rent systems, some of which are old and in need of upgrading, must ISBN 978-0-309-48167-0 expand service area, increase service frequency, and improve efficiency © 2020 National Academy of Sciences. All rights reserved. to serve these demands. Research is necessary to solve operating prob- lems, adapt appropriate new technologies from other industries, and introduce innovations into the transit industry. The Transit Coopera- tive Research Program (TCRP) serves as one of the principal means by COPYRIGHT INFORMATION which the transit industry can develop innovative near-term solutions Authors herein are responsible for the authenticity of their materials and for obtaining to meet demands placed on it. written permissions from publishers or persons who own the copyright to any previously The need for TCRP was originally identified in TRB Special Report published or copyrighted material used herein. 213—Research for Public Transit: New Directions, published in 1987 Cooperative Research Programs (CRP) grants permission to reproduce material in this and based on a study sponsored by the Urban Mass Transportation publication for classroom and not-for-profit purposes. Permission is given with the Administration—now the Federal Transit Administration (FTA). A understanding that none of the material will be used to imply TRB, AASHTO, FAA, FHWA, report by the American Public Transportation Association (APTA), FTA, GHSA, NHTSA, or TDC endorsement of a particular product, method, or practice. It is expected that those reproducing the material in this document for educational and Transportation 2000, also recognized the need for local, problem- not-for-profit uses will give appropriate acknowledgment of the source of any reprinted or solving research. TCRP, modeled after the successful National Coop- reproduced material. For other uses of the material, request permission from CRP. erative Highway Research Program (NCHRP), undertakes research and other technical activities in response to the needs of transit ser- vice providers. The scope of TCRP includes various transit research NOTICE fields including planning, service configuration, equipment, facilities, operations, human resources, maintenance, policy, and administrative The research report was reviewed by the technical panel and accepted for publication practices. according to procedures established and overseen by the Transportation Research Board and approved by the National Academies of Sciences, Engineering, and Medicine. TCRP was established under FTA sponsorship in July 1992. Proposed by the U.S. Department of Transportation, TCRP was authorized as The opinions and conclusions expressed or implied in this report are those of the part of the Intermodal Surface Transportation Efficiency Act of 1991 researchers who performed the research and are not necessarily those of the Transportation Research Board; the National Academies of Sciences, Engineering, and Medicine; or the (ISTEA). On May 13, 1992, a memorandum agreement outlining TCRP program sponsors. operating procedures was executed by the three cooperating organi- The Transportation Research Board; the National Academies of Sciences, Engineering, and zations: FTA; the National Academies of Sciences, Engineering, and Medicine; and the sponsors of the Transit Cooperative Research Program do not endorse Medicine, acting through the Transportation Research Board (TRB); products or manufacturers. Trade or manufacturers’ names appear herein solely because and the Transit Development Corporation, Inc. (TDC), a nonprofit they are considered essential to the object of the report. educational and research organization established by APTA. TDC is responsible for forming the independent governing board, designated as the TCRP Oversight and Project Selection (TOPS) Commission. Research problem statements for TCRP are solicited periodically but may be submitted to TRB by anyone at any time. It is the responsibility of the TOPS Commission to formulate the research program by identi- fying the highest priority projects. As part of the evaluation, the TOPS Commission defines funding levels and expected products. Once selected, each project is assigned to an expert panel appointed by TRB. The panels prepare project statements (requests for propos- als), select contractors, and provide technical guidance and counsel throughout the life of the project. The process for developing research problem statements and selecting research agencies has been used by TRB in managing cooperative research programs since 1962. As in other TRB activities, TCRP project panels serve voluntarily without compensation. Because research cannot have the desired effect if products fail to reach the intended audience, special emphasis is placed on disseminat- ing TCRP results to the intended users of the research: transit agen- cies, service providers, and suppliers. TRB provides a series of research Published research reports of the reports, syntheses of transit practice, and other supporting material TRANSIT COOPERATIVE RESEARCH PROGRAM developed by TCRP research. APTA will arrange for workshops, train- are available from ing aids, field visits, and other activities to ensure that results are imple- mented by urban and rural transit industry practitioners. Transportation Research Board Business Office TCRP provides a forum where transit agencies can cooperatively 500 Fifth Street, NW address common operational problems. TCRP results support and Washington, DC 20001 complement other ongoing transit research and training programs. and can be ordered through the Internet by going to https://www.nationalacademies.org and then searching for TRB Printed in the United States of America Copyright National Academy of Sciences. All rights reserved. Equity Analysis in Regional Transportation Planning Processes, Volume 1: Guide In Memoriam Statement of Appreciation to TCRP H-54 Panel Member Nikki Tishler (Deceased March 25, 2018) Nikki Tishler was a transportation planner and Title VI strategist with the Office of Trans- portation Planning of the Massachusetts Department of Transportation, supporting capital planning and civil rights compliance activities at the agency. With a background in com- munity organizing, Nikki was passionate about promoting civic engagement and improving public participation processes so that public-sector activities would reflect the needs and wants of the public. In her role as Title VI strategist, Nikki saw the consideration of civil rights and transportation equity as an opportunity to improve the customer experience for the diverse constituencies served by the Massachusetts Department of Transportation. Nikki held a joint Master of Public Policy and Master of Arts in Women’s and Gender Studies from Brandeis University’s Heller School for Social Policy and Management and a Bachelor of Arts in Civic Engagement and the Politics of Representation from the University of Massachusetts–Amherst. On April 9, 2018, the Senate of the Commonwealth of Massachusetts approved a motion to adjourn in honor of Nikki. The text of the motion reads as follows: The Commonwealth of Massachusetts JOURNAL OF THE SENATE Adjourn In Memory of Nikki Tishler The Senator from Norfolk and Plymouth, Mr. Keenan, moved that when the Senate adjourns today it adjourn in memory of Nikki Tishler. Nikki Tishler passed away after a brief illness on
Recommended publications
  • Kinematics Study of Motion
    Kinematics Study of motion Kinematics is the branch of physics that describes the motion of objects, but it is not interested in its causes. Itziar Izurieta (2018 october) Index: 1. What is motion? ............................................................................................ 1 1.1. Relativity of motion ................................................................................................................................ 1 1.2.Frame of reference: Cartesian coordinate system ....................................................................................................................................................................... 1 1.3. Position and trajectory .......................................................................................................................... 2 1.4.Travelled distance and displacement ....................................................................................................................................................................... 3 2. Quantities of motion: Speed and velocity .............................................. 4 2.1. Average and instantaneous speed ............................................................ 4 2.2. Average and instantaneous velocity ........................................................ 7 3. Uniform linear motion ................................................................................. 9 3.1. Distance-time graph .................................................................................. 10 3.2. Velocity-time
    [Show full text]
  • Short Range Object Detection and Avoidance
    Short Range Object Detection and Avoidance N.F. Jansen CST 2010.068 Traineeship report Coach(es): dr. E. García Canseco, TU/e dr. ing. S. Lichiardopol, TU/e ing. R. Niesten, Wingz BV Supervisor: prof.dr.ir. M. Steinbuch Eindhoven University of Technology Department of Mechanical Engineering Control Systems Technology Eindhoven, November, 2010 Abstract The scope of this internship is to investigate, model, simulate and experiment with a sensor for close range object detection for the purpose of the Tele-Service Robot (TSR) robot. The TSR robot will be implemented in care institutions for the care of elderly and/or disabled. The sensor system should have a supporting role in navigation and mapping of the environment of the robot. Several sensors are investigated, whereas the sonar system is the optimal solution for this application. It’s cost, wide field-of-view, sufficient minimal and maximal distance and networking capabilities of the Devantech SRF-08 sonar sensor is decisive to ultimately choose this sensor system. The positioning, orientation and tilting of the sonar devices is calculated and simulations are made to obtain knowledge about the behavior and characteristics of the sensors working in a ring. Issues surrounding the sensors are mainly erroneous ranging results due to specular reflection, cross-talk and incorrect mounting. Cross- talk can be suppressed by operating in groups, but induces the decrease of refresh rate of the entire robot’s surroundings. Experiments are carried out to investigate the accuracy and sensitivity to ranging errors and cross-talk. Eventually, due to the existing cross-talk, experiments should be carried out to decrease the range and timing to increase the refresh rate because the sensors cannot be fired more than only two at a time.
    [Show full text]
  • 3D Computer Graphics Compiled By: H
    animation Charge-coupled device Charts on SO(3) chemistry chirality chromatic aberration chrominance Cinema 4D cinematography CinePaint Circle circumference ClanLib Class of the Titans clean room design Clifford algebra Clip Mapping Clipping (computer graphics) Clipping_(computer_graphics) Cocoa (API) CODE V collinear collision detection color color buffer comic book Comm. ACM Command & Conquer: Tiberian series Commutative operation Compact disc Comparison of Direct3D and OpenGL compiler Compiz complement (set theory) complex analysis complex number complex polygon Component Object Model composite pattern compositing Compression artifacts computationReverse computational Catmull-Clark fluid dynamics computational geometry subdivision Computational_geometry computed surface axial tomography Cel-shaded Computed tomography computer animation Computer Aided Design computerCg andprogramming video games Computer animation computer cluster computer display computer file computer game computer games computer generated image computer graphics Computer hardware Computer History Museum Computer keyboard Computer mouse computer program Computer programming computer science computer software computer storage Computer-aided design Computer-aided design#Capabilities computer-aided manufacturing computer-generated imagery concave cone (solid)language Cone tracing Conjugacy_class#Conjugacy_as_group_action Clipmap COLLADA consortium constraints Comparison Constructive solid geometry of continuous Direct3D function contrast ratioand conversion OpenGL between
    [Show full text]
  • Help Contents Page 1 of 252
    OziExplorer Help Contents Page 1 of 252 Help Contents OziExplorer Help Contents About OziExplorer GPS Mapping Software Conditions of Use Printing Help File Program History Getting Started History of Changes Demonstration Data Help Tutorial Known Problems in this Version (Essential Reading) Configuration Hints & Tips Configuration Common User Problems Tutorial Frequently Asked Questions Tutorial (Demonstration Data) Trouble Shooting GPS Receivers Lowrance and Eagle GPS Receivers Garmin GPS Receivers Magellan GPS Receivers MLR GPS Receivers Brunton / Silva GPS NMEA Only Tripmate GPS Earthmate GPS Program Menus and Toolbars Toolbar User Toolbar File Menu Select Menu Load Menu (on Toolbar) Save Menu (on Toolbar) View Menu Options Menu Moving Map Menu Map Menu Navigation Menu Garmin Menu Magellan Menu Lowrance Menu MLR Menu Brunton / Silva Menu GPS - NMEA Only menu OziExplorer Help Contents Page 2 of 252 Map Related Creating (Calibrating) Maps Image Formats Supported Map Projections France Grids Changing the Map Image File Import Map Features and Comments Importing DRG Maps Converting Geotiff Image Files Importing BSB Charts Importing NOS/GEO Charts Importing NV.Digital Charts Importing Maptech PCX and RML Charts Import QuoVadis Navigator Maps Importing ECW Maps Importing SID Maps Save Map to Image File Map Searching Index Map Name Search Using the Find Map Feature Using the Blank Map Magnetic Variation Seamless Maps Datums Datums Adding User Datums Display Datum Moving Map (Real Time Tracking) Moving Map Proximity Waypoints Alarm Zones Range
    [Show full text]
  • Integration of Ray-Tracing Methods Into the Rasterisation Process University of Dublin, Trinity College
    Integration of Ray-Tracing Methods into the Rasterisation Process by Shane Christopher, B.Sc. GMIT, B.Sc. DLIADT Dissertation Presented to the University of Dublin, Trinity College in fulfillment of the requirements for the Degree of MSc. Computer Science (Interactive Entertainment Technology) University of Dublin, Trinity College September 2010 Declaration I, the undersigned, declare that this work has not previously been submitted as an exercise for a degree at this, or any other University, and that unless otherwise stated, is my own work. Shane Christopher September 8, 2010 Permission to Lend and/or Copy I, the undersigned, agree that Trinity College Library may lend or copy this thesis upon request. Shane Christopher September 8, 2010 Acknowledgments I would like to thank my supervisor Michael Manzke as well as my course director John Dingliana for their help and guidance during this dissertation. I would also like to thank everyone who gave me support during the year and all my fellow members of the IET course for their friendship and the motivation they gave me. Shane Christopher University of Dublin, Trinity College September 2010 iv Integration of Ray-Tracing Methods into the Rasterisation Process Shane Christopher University of Dublin, Trinity College, 2010 Supervisor: Michael Manzke Visually realistic shadows in the field of computer games has been an area of constant research and development for many years. It is also considered one of the most costly in terms of performance when compared to other graphical processes. Most games today use shadow buffers which require rendering the scene multiple times for each light source.
    [Show full text]
  • Polish Game Industry
    THE GAME INDUSTRY REPORT 2020 OF POLAND W ASD Enter Shift Alt Ctrl W A S D The game industry of Poland — Report 2020 Authors: Eryk Rutkowski Polish Agency for Enterprise Development Jakub Marszałkowski Indie Games Poland, Poznan University of Technology Sławomir Biedermann Polish Agency for Enterprise Development Edited by Sławomir Biedermann, Jakub Marszałkowski Cooperation: Ministry of Development Ministry of Culture and National Heritage Expert support: Game Industry Conference Published by the Polish Agency for Enterprise Development Pańska 81/83, 00-834 Warsaw, Poland www.parp.gov.pl © Polish Agency for Enterprise Development 2020 ISBN 978-83-7633-434-9 The views expressed in this publication are those of the authors and do not necessarily coincide with activities of the Polish Agency for Enterprise Development. All product names, logos and brands mentioned in this publication are the property of their respective owners. Printing of this publication has been co-financed from the European Regional Development Fund in the framework of the Smart Growth Operational Programme. 4 Table of contents Overview of the gaming sector .............................................................................................................. 7 A game has to stir up emotions Success story of 11 bit studios ............................................................................................................... 11 Global game market growth estimates and drivers ................................................................... 13 To diversify
    [Show full text]
  • Active Sky for P3dv4 User's Guide
    Active Sky for P3Dv4 User’s Guide Last Revision: 04/26/2018 Active Sky for P3Dv4 User’s Guide Legal Notices By using this software, you are bound by the End User License Agreement which you accepted during installation. Please refer to the EULA_P3Dv4.rtf file included with your installation, located in the base program installation folder, along with the AdditionalLicenses.rtf or AdditionalLicenses.txt file. Under no circumstances is this software to be used for real aircraft operation or planning activities. This software is designed for use as an entertainment and educational product, is not fault-tolerant, and is not acceptable for use in high risk activities including, but not limited to, aircraft operation and planning. This software may only be used by one person on one computer. Attempting to use this product by more than one person or on more than one computer may result in the product becoming unusable. An internet connection is required for automated registration and activation of the product, as well as usage of most product features. This product may be unusable without a working internet connection. This software’s online services include access to private servers, which keep track of all online activity and usage. Illegal or unauthorized access to our servers, by way of unlicensed product usage or piracy, is automatically identified and tracked. Continued illegal usage may result in prosecution. Copyright © 2016-2018 HiFi Technologies, Inc. All Rights Reserved Page 1 Active Sky for P3Dv4 User’s Guide Table of Contents Introduction
    [Show full text]
  • GPU-Driven Rendering Pipelines
    SIGGRAPH 2015: Advances in Real-Time Rendering in Games GPU-Driven Rendering Pipelines Ulrich Haar, Lead Programmer 3D, Ubisoft Montreal Sebastian Aaltonen, Senior Lead Programmer, RedLynx a Ubisoft Studio Topics • Motivation • Mesh Cluster Rendering • Rendering Pipeline Overview • Occlusion Depth Generation • Results and future work SIGGRAPH 2015: Advances in Real-Time Rendering course GPU-Driven Rendering? • GPU controls what objects are actually rendered • “draw scene” GPU-command – n viewports/frustums – GPU determines (sub-)object visibility – No CPU/GPU roundtrip • Prior work [SBOT08] SIGGRAPH 2015: Advances in Real-Time Rendering course Motivation (RedLynx) • Modular construction using in-game level editor • High draw distance. Background built from small objects. • No baked lighting. Lots of draw calls from shadow maps. • CPU used for physics simulation and visual scripting SIGGRAPH 2015: Advances in Real-Time Rendering course Motivation Assassin’s Creed Unity • Massive amounts of geometry: architecture SIGGRAPH 2015: Advances in Real-Time Rendering course Motivation Assassin’s Creed Unity • Massive amounts of geometry: seamless interiors SIGGRAPH 2015: Advances in Real-Time Rendering course Motivation Assassin’s Creed Unity • Massive amounts of geometry: crowds SIGGRAPH 2015: Advances in Real-Time Rendering course Motivation Assassin’s Creed Unity • Modular construction (partially automated) • ~10x instances compared to previous Assassin’s Creed games • CPU scarcest resource on consoles SIGGRAPH 2015: Advances in Real-Time Rendering
    [Show full text]
  • Convincing Cloud Rendering an Implementation of Real-Time Dynamic Volumetric Clouds in Frostbite Master’S Thesis in Computer Science – Computer Systems and Networks
    Convincing Cloud Rendering An Implementation of Real-Time Dynamic Volumetric Clouds in Frostbite Master’s thesis in Computer Science – Computer Systems and Networks RURIK HÖGFELDT Department of Computer Science and Engineering CHALMERS UNIVERSITY OF TECHNOLOGY UNIVERSITY OF GOTHENBURG Gothenburg, Sweden 2016 Convincing Cloud Rendering - An Implementation of Real-Time Dynamic Volumetric Clouds in Frostbite Rurik Högfeldt © Rurik Högfeldt 2016 Supervisor: Erik Sintorn Department of Computer Science and Engineering Examiner: Ulf Assarsson Department of Computer Science and Engineering Computer Science and Engineering Chalmers University of Technology SE-412 96 Gothenburg Sweden Telephone +46 (0)31 772 1000 Department of Computer Science and Engineering Gothenburg, Sweden, 2016 Abstract This thesis describes how real-time realistic and convincing clouds were implemented in the game engine Frostbite. The implemen- tation is focused on rendering dense clouds close to the viewer while still supporting the old system for high altitude clouds. The new technique uses ray marching and a combination of Perlin and Worley noises to render dynamic volumetric clouds. The clouds are projected into a dome to simulate the shape of a planet's at- mosphere. The technique has the ability to render from different viewpoints and the clouds can be viewed from both below, inside and above the atmosphere. The final solution is able to render re- alistic skies with many different cloud shapes at different altitudes in real-time. This with completely dynamic lighting. Acknowledgements I would like to thank the entire Frostbite team for making me feel welcome and giving me the opportunity to work with them. I would especially want to thank my two supervisors at Frostbite, S´ebastien Hillaire and Per Einarsson for their help and guidance throughout the project.
    [Show full text]
  • System Stability of the Open Draw Section and Paper Machine Runnability
    Preferred citation: S. Edvardsson and T. Uesaka. System stability of the open draw section and paper machine runnability. In Advances in Pulp and Paper Research, Oxford 2009, Trans. of the XIVth Fund. Res. Symp. Oxford, 2009, (S.J. I’Anson, ed.), pp 557–575, FRC, Manchester, 2018. DOI: 10.15376/frc.2009.1.557. SYSTEM STABILITY OF THE OPEN DRAW SECTION AND PAPER MACHINE RUNNABILITY S. Edvardsson and T. Uesaka* Fibre Science and Communication Network, and Department of Natural Sciences, Engineering and Mathematics, Mid Sweden University, S-851 70, Sundsvall, Sweden ABSTRACT The present work is concerned with the system dynamics and stability of the open draw sections of paper machines where web breaks occur most frequently. We have applied a novel particle- based system dynamics model that allows the investigation of complex interactions between web property fluctuations and sys- tem parameters, without any constraints of a particular geo- metrical web shape or boundary conditions assumed a priori. The result shows that, at a given machine draw and web property parameters, the open draw section maintains its steady-state until it reaches a certain machine speed limit. At this speed the system looses its stability and the web strain starts growing without any limit, and thus leading to a web break. A similar instability can also be triggered when web properties suddenly fluctuate during steady-state operation. The parametric sensitivity studies indicate that, among the web property parameters studied, the elastic modulus of the wet web has the largest impact on the critical machine speed as well as on the detachment point where the web is released from the first roll.
    [Show full text]
  • Interplay: the Adaptive Contexts of Videogame Adaptations
    Stuart Knott Interplay Interplay: The Adaptive Contexts of Videogame Adaptations and Franchises Across Media By Stuart Knott Submitted in partial fulfilment of the requirements of a PhD degree at De Montfort University, Leicester April 2016 1 Stuart Knott Interplay Table of Contents Abstract 3 Acknowledgements 4 Introduction i.i Understanding Videogame Adaptations 5 i.ii Existing Work 11 i.iii Chapter Summary 14 i.iv Conclusion 21 Chapter One: A Brief History of Videogames and their Adaptations 1.1 Theory and History 23 1.2 Cinema(tic) Immersion 34 1.3 Reputation 47 1.4 The Japanese Connection 58 1.5 Early Videogame Adaptations 66 1.6 Cross-Media Complexity 82 1.7 Conclusion 93 Chapter Two: Japanese Videogame Culture as International Multimedia 2.1 The Console Wars 98 2.2 Building a Mascot 110 2.3 Developing a Franchise 120 2.4 Sonic the Animation 128 2.5 International Multimedia 147 2.6 Conclusion 160 Chapter Three: Unifying Action and Culture through Mortal Kombat 3.1 Martial Arts Cinema 165 3.2 The Action Genre 173 3.3 Arcade Duelling 186 3.4 Adapting Street Fighter 195 3.5 Franchising Mortal Kombat 201 3.6 Cult Success and Aftermath 216 3.7 Conclusion 227 Chapter Four: The Appropriations, Economics, and Interplay of Resident Evil 4.1 Zombie Cinema 232 4.2 Developing Resident Evil 240 4.3 The Economics of Adaptation 247 4.4 Personifying Adaptation 265 4.5 Further Appropriations 284 4.6 Beyond Anderson 291 4.7 Conclusion 297 Conclusion 305 Appendices Appendix One: Videogame Adaptations 329 Appendix Two: Sonic Timeline 338 References 343 2 Stuart Knott Interplay Abstract Videogame adaptations have been a staple of cinema and television since the 1980s and have had a consistent presence despite receiving overwhelmingly negative reactions.
    [Show full text]
  • High-Throughput Dynamic SNP Visualizing Tool
    iBrowser2: high-throughput dynamic SNP visualizing tool Author: Guangnan Chen Supervisor: Dick de Ridder Chair Group: Bioinformatics Abstract Introgressive hybridization is a common way to broaden the genetic base of crops by introducing traits from their wild relatives used by plant breeders. To facilitate plant breeding and researching, previously, the introgression browser (iBrowser) was developed to visualize introgressions using homozygous SNPs from Variant Call Format (VCF) files. iBrowser is a strong tool for introgression visualization but has several drawbacks. Its database stores only data of a single resolution, meaning that in order to explore a chromosome across various scales, multiple databases are required. It is also necessary to build a new database once a new accession is added. Here, we present a new version of iBrowser named iBrowser2, which comes with a renewed workflow that requires the construction of only a single database for each species and enables fast dynamic data access across all scales of chromosomes. iBrowser2 also combines a new two-reference mode that can be used to detect crossover profiles in a population, which was inspired by a similar approach called PAVs to detect crossover profiles. iBrowser2 can offer most functionalities of iBrowser, and its result can repeat the finding of iBrowser. The crossover profiles found by iBrowser2 shows similarity in general with one found by PAV approach, but also contain important differences that are hard to explain. The iBrowser2 was proved to be scalable. It can visualize SNPs of hundreds of accessions in seconds. For small datasets, it is a convenient and flexible analyzing tool that runs on a laptop.
    [Show full text]