5,710 research outputs found

    Use of ERTS-1 data for regional planning in the Metropolitan Washington Council of Governments: A short brief

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    Land use and land use activity changes over discrete intervals of time represent basic data requirements in regional planning studies. Two examples of land use analysis required by the Council of Governments' transportation planning staff are described. Both were undertaken utilizing remote sensing imagery analysis. One study using large scale aircraft imagery developed a high degree of analytical detail and functional identification. The other, to support further detailed data base evaluation, utilizing ERTS-1 and small scale aircraft imagery, developed data identifying in more general detail major activity changes within the metropolitan region

    Projective rectification from the fundamental matrix

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    This paper describes a direct, self-contained method for planar image rectification of stereo pairs. The method is based solely on an examination of the Fundamental matrix, where an improved method is given for the derivation of two projective transformations that horizontally align all the epipolar projections. A novel approach is proposed to uniquely optimise each transform in order to minimise perspective distortions. This ensures the rectified images resemble the original images as closely as possible. Detailed results show that the rectification precision exactly matches the estimation error of the Fundamental matrix. In tests the remaining perspective distortion offers on average less than one percent viewpoint distortion. Both these factors offer superior robustness and performance compared with existing techniques

    An analysis of household transportation spending during the 2007-2009 US economic recession

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    The recent economic recession in the United States led to widespread destruction of jobs, home foreclosures, credit freeze and to creditor repossessions of key assets such as personal cars. Our objective is to empirically assess transportation conditions of US households with a focus on transportation spending. The latter is examined in the context of changes in multiple metrics such as total number of household cars, zero-vehicle status, expenditures on local public transportation and gasoline, down payment and net purchase price of cars, decline in household vehicle stock, and interest rates on auto loans. Using an econometric model of repeated cross-sections of data on households from the Consumer Expenditure Survey for the period 2005 through 2009, we examine factors which affect recession-period spending. In an effort to demonstrate the effects of the recession on specific groups, as well as to examine equity implications for vulnerable populations, our overall results are disaggregated by variations in transportation spending of minority, single mother and young households. Transportation spending declined significantly between 2005 and the recession years. A large part of this was due to lower car-ownership levels and an overall increase in zero-car households. Those households that did acquire a car needed to make higher levels of down payment. They also paid higher interest rates compared to the pre-recession period. Minorities spent significantly less than non-minorities before the recession but the difference from non-minorities was not significant during the recession. Single mothers did not spend significantly less than other households overall; however, their spending level became significantly less during the recession and they were much more likely to become zero-car households during the recession. The cost of car-ownership increased drastically for young adult households and the share of carless young households greatly increased during the recession

    Calibration and removal of lateral chromatic aberration in images

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    This paper addresses the problem of compensating for lateral chromatic aberration in digital images through colour plane realignment. Two main contributions are made: the derivation of a model for lateral chromatic aberration in images, and the subsequent calibration of this model from a single view of a chess pattern. These advances lead to a practical and accurate alternative for the compensation of lateral chromatic aberrations. Experimental results validate the proposed models and calibration algorithm. The effects of colour channel correlations resulting from the camera colour filter array interpolation is examined and found to have a negligible magnitude relative to the chromatic aberration. Results with real data show how the removal of lateral chromatic aberration significantly improves the colour quality of the image

    Factors Determining Transit Access by Car Owners: Implications for Intermodal Passenger Transportation Planning

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    Although walking is the dominant mode of transportation to transit facilities, there are strong variations by socio-demographics, geography, mode of public transit used and other factors. There is particularly a need to understand ways in which car owners who choose to use public transportation can be encouraged to carpool, walk or bicycle in the “first mile” and “last mile” of the transit trip, instead of driving. These considerations have implications for addressing cold start trips resulting from short drives to transit facilities, active transportation strategies that may benefit transit users who currently drive, and in deriving solutions for shared transportation such as bicycle-sharing and car-sharing programs. Using data collected in the Chicago Metropolitan Area, we investigate how the mode choice for the access trip to transit stations is related to costs, personal and household variables, trip characteristics, and neighborhood factors including crash frequencies, crime prevalence, neighborhood racial characteristics, population density, roadway density etc. for persons in car owning households. The results suggest that while much of the choice depends on personal and trip related variables, some neighborhood level factors as well as the provision of parking at transit stations have important relationships to mode choice that can influence built environment factors such as density and policy areas such as the provision and operation of transit parking facilities

    China's Post Accession WTO Stance

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    We discuss China's stance in the WTO post-accession, noting the many issues with implementation of China's accession terms by 2007. We evaluate how much benefit China can realistically receive from WTO membership given current problems with dumping actions against China and trade restrictions against textile and apparel exports. We discuss emerging WTO and non-WTO trade disputes involving China, and China's now extensive regional trade initiatives which raise issues of multilateral regional balance on China's trade policy strategy.

    The Financial Feasibility of Anaerobic Digestion for Ontario's Livestock Industries

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    This report is an investigation of the financial feasibility of farm based anaerobic digestion investments under Ontario's Standard Offer Contract electricity prices. Using Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) Agricultural Anaerobic Digestion Calculation Spreadsheet (AADCS) anaerobic digestion inputs, outputs, cost and revenues were estimated and used to conduct a financial analysis on the feasibility of four sized farm base anaerobic digestion investments. The results suggest investment in an anaerobic digestion system smaller than 300 kilo-watts is not financially feasible under the chosen base model assumptions and Ontario's Standard Offer Contract. The efficiency of the anaerobic digestion systems,discussed in the report as electricity yield, was found to have the largest impact on the investments financial feasibility. Incorporating off-farm organic material improved financial feasibility by increasing biogas production and offering the potential for tipping fee revenue.Livestock Production/Industries,
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