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Title:

A Comparison of Mapping Methodologies Identifying Transportation Disadvantaged Populations and Extreme Weather Risk

Accession Number:

01763890

Record Type:

Component

Abstract:

This analysis compares three increasingly granular mapping methodologies to predict where transportation disadvantaged (TD) populations live in the Boston area. The methods are as follows: (1) A standard choropleth method, which utilizes a binary system to determine levels of TD and a thematic shading symbology, (2) a dasymetric mapping method utilizing the Environmental Protection Agency’s Intelligent Dasymetric Mapping (IDM) Toolbox to redistribute population based on land use, and (3) a Cadastral-Based Expert Dasymetric System (CEDS) which utilizes parcel data to redistribute population and principal component analysis of vulnerability attributes. In addition to using these three methods to estimate TD population, this paper investigates vulnerability to extreme weather risk by estimating TD populations living within evacuation zones or within a reasonable walk to a shelter.The CEDS results suggest approximately 20% more people may require evacuation assistance than the Massachusetts Emergency Management Agency estimates. In total, 14% of the population in the study area (487,389 people) are at risk of being in a TD location, and of these people, 14% live within an evacuation zone and farther than a 20-minute walk from a potential shelter. In the future, planners could utilize this dasymetric mapping method, paired with outreach and training, to proactively plan for extreme weather events.

Supplemental Notes:

This paper was sponsored by TRB committee AMR50 Standing Committee on Extreme Weather and Climate Change Adaptation.

Report/Paper Numbers:

TRBAM-21-00218

Language:

English

Corporate Authors:

Transportation Research Board

Authors:

Morrow, Megan
Srinivasan, Sumeeta

Pagination:

17p

Publication Date:

2021

Conference:

Transportation Research Board 100th Annual Meeting

Location: Washington DC, United States
Date: 2021-1-5 to 2021-1-29
Sponsors: Transportation Research Board; Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Maps; References; Tables

Geographic Terms:

Boston Metropolitan Area

Subject Areas:

Planning and Forecasting; Security and Emergencies; Transportation (General)

Source Data:

Transportation Research Board Annual Meeting 2021 Paper #TRBAM-21-00218

Files:

TRIS, TRB, ATRI

Created Date:

Dec 23 2020 11:13AM