The development and applications of geographic information systems for urban and regional planning in the developing countries     

ANTHONY GAR-ON YEH 《International journal of geographical information science》2013,27(1):5-27

Abstract

In the past 10 years, geographic information systems (GIS) have been widely used in urban and regional planning in the developed countries in Australia, North America and Europe. However, the use of GIS in urban and regional planning in the developing countries is limited and still at an early stage of development. This paper examines the current use of GIS in urban and regional planning in the developing countries in Asia. The major hindrances in the use of GIS in the developing countries is related not so much to the technology of GIS but more to data availability, leadership, organization structure and planning practice. For GIS to be more useful to urban and regional planning in the developing countries the development of a sustainable strategy in developing GIS and staff training is needed. International assistance agencies and GIS software companies can play an active role in making GIS available and usable to the planners in the developing countries.  相似文献   

Ice nuclei characteristics from M-PACE and their relation to ice formation in clouds   总被引：1，自引：0，他引：1  

By ANTHONY J. PRENNI  PAUL J. DEMOTT  DAVID C. ROGERS  SONIA M. KREIDENWEIS  GREG M. MCFARQUHAR  GONG ZHANG  MICHAEL R. POELLOT 《Tellus. Series B, Chemical and physical meteorology》2009,61(2):436-448

This paper presents airborne measurements of ice nuclei (IN) number concentration and elemental composition from the mixed-phase Arctic cloud experiment (M-PACE) in northern Alaska during October 2004. Although the project average IN concentration was low, less than 1 L⁻¹ STP, there was significant spatial and temporal variability, with local maximum concentrations of nearly 60 L⁻¹ STP. Immersion and/or condensation freezing appear to be the dominant freezing mechanisms, whereas mechanisms that occur below water saturation played a smaller role. The dominant particle types identified as IN were metal oxides/dust (39%), carbonaceous particles (35%) and mixtures of metal oxides/dust with either carbonaceous components or salts/sulphates (25%), although there was significant variability in elemental composition. Trajectory analysis suggests both local and remote sources, including biomass burning and volcanic ash. Seasonal variability of IN number concentrations based on this study and data from SHEBA/FIRE-ACE indicates that fall concentrations are depleted relative to spring by about a factor of five. Average IN number concentrations from both studies compare favorably with cloud ice number concentrations of cloud particles larger than 125 μm, for temperatures less than −10 °C. Cloud ice number concentrations also were enhanced in spring, by a factor of ∼2, but only over a limited temperature range.  相似文献   

Sedimentation in a tropical, microtidal, wave-dominated coastal-plain estuary     

E. J. ANTHONY  J. LANG†  L. M. OYÉDE‡ 《Sedimentology》1996,43(4):665-675

The Mono estuary is an infilled, microtidal estuary located on the wave-dominated Bight of Benin coast which is subject to very strong eastward longshore drift. The estuarine fill comprises a thick unit of lagoonal mud deposited in a ‘central basin’between upland fluvial deposits and estuary-mouth wave-tide deposits. This lagoonal fill is capped by organic-rich tidal flat mud. In addition to tidal flat mud, the superficial facies overlying the ‘central basin’fill include remnants of spits resting on transgressive/washover sand, an estuary-mouth association of beach, shoreface, flood-tidal delta and tidal inlet deposits, and a thin sheet of fluvial sediments deposited over tidal flat mud. After an initial phase of spit intrusion over the infilled central basin east of the present Mono channel, the whole estuary mouth became bounded by a regressive barrier formed from sand supplied by the Volta Delta during the middle Holocene eustatic highstand. Barrier progradation ceased late in the Holocene following the establishment of an equilibrium plan-form shoreline alignment that allowed through-drift of Volta sand to sediment sinks further downdrift. Over the same period, accretion, from fluvially supplied sediments, of the estuarine plain close to the limit of spring high tides, or, over much of the lower valley, into a fluvial plain no longer subject to tidal flooding, induced marked meandering of the Mono and its tidal distributaries in response to confinement of much of the tidal prism to these channels. The process resulted in erosion of spit/washover and regressive barrier sand, and in reworking of the tidal flat and floodbasin deposits. The strong longshore drift, equilibrium shoreline alignment and the year-round persistence of a tidal inlet maintained by discharge from the Mono and from Lake Ahémé have resulted in a stationary barrier that is reworked by a mobile inlet. The Mono example shows that advanced estuarine infill may result in considerable facies reworking, obliteration of certain facies and marked spatial imbrication of fluvial, estuarine and wave-tide-deposited facies, and confirms patterns of sedimentary change described for microtidal estuaries on wave-influenced coasts. In addition, this study shows that local environmental factors such as sediment supply relative to limited accommodation space, and strong longshore drift, which may preclude accumulation of sediments in the vicinity of the estuary mouth, may lead to infilled equilibrium or near-equilibrium estuaries that will not necessarily evolve into deltas.  相似文献   

Peri-Urbanisation and Rural Roads     

ANTHONY ELSON  LEX CHALMERS  MUNRO MORAD 《New Zealand geographer》1996,52(2):65-69

This paper examines the impact of periurban development on the physical capacity of the roading network in an area to the north west of Tauranga, exploring the potential impact of subdivision, population growth and building of new residences in rural areas with respect to pressures on rural roads. Geographic Information Systems (GIS) are used to integrate large volumes of complex road and other data, model traffic flow generated from these data, display the outcomes effectively and test the effect of different development scenarios in a particular peri-urban environment.  相似文献   

The occurrence of sulfuric acid-water nucleation in plumes: urban environment   总被引：1，自引：0，他引：1  

VELI-MATTI KERMINEN  ANTHONY S. WEXLER 《Tellus. Series B, Chemical and physical meteorology》1996,48(1):65-82

  相似文献   

Little known but important papers on grain-size analysis     

ANTHONY SOCCI  W. F. TANNER 《Sedimentology》1980,27(2):231-232

Some important papers have apparently gone unnoticed by most sedimentologists, as shown by their absence from bibliographies of recent texts. These papers concern sample size, permissible number of splits, sieving time, and sieve-vs-settling tube comparisons. These papers were published where sedimentologists would not ordinarily see them, but should be required reading for students.  相似文献   

TIME LAGS AND NOVEL ECOSYSTEMS IN RESPONSE TO TRANSIENT CLIMATIC CHANGE IN ARCTIC ALASKA     

F. STUART CHAPIN III  ANTHONY M. STARFIELD 《Climatic change》1997,35(4):449-461

We use a frame-based simulation model to estimate future rate of advance of the arctic treeline in response to scenarios of transient changes in temperature, precipitation, and fire regime. The model is simple enough to capture both the short-term direct response of vegetation to climate and the longer-term interactions among vegetation, fire, and insects that are important features of dynamic vegetation models. We estimate a 150–250 yr time lag in forestation of Alaskan tundra following climatic warming and suggest that, with rapid warming under dry conditions, there would be significant development of boreal grassland-steppe, a novel ecosystem type that was common during the late Pleistocene and today occurs south of the boreal forest in continental regions. Together, the time lag and grassland development would delay the positive feedback of vegetation change to climatic warming, providing a window of opportunity to control fossil fuel emissions, the primary cause of this warming.  相似文献   

A comparison of an autosuspension criterion to field observations of five turbidity currents     

MICHAEL W. STACEY  ANTHONY J. BOWEN† 《Sedimentology》1990,37(1):1-5

An autosuspension criterion that has been developed directly from the fluid dynamical equations, by taking into account the vertical structure of turbidity currents, is compared to field observations of five turbidity currents. It is found that the criterion is consistent with the motion of all five currents, which suggests that the criterion may, at least under certain circumstances, be a reasonable guide in estimating the conditions necessary for a turbidity current to be self-sustaining.  相似文献   

OVERCOMING THE APARTHEID LEGACY IN CAPE TOWN SCHOOLS*     

ANTHONY LEMON  JANE BATTERSBY‐LENNARD 《Geographical review》2009,99(4):517-538

ABSTRACT. Restructuring apartheid geographies of racial stratification and spatial segregation poses formidable challenges, not least in education. Increasing intraracial inequality also underscores the importance of widening access and opportunity. Although South African education is not constrained by the highly localized control found in the United States and the United Kingdom, school allocation policies and parental choices create geographies that intersect with those of race and residence. Spatial variations critically influence both the impacts of postapartheid policies and the patterns of school desegregation. In this article we explore the spatial impact of inequality, desegregation, and state policies in relation to fourteen secondary schools in Cape Town, distinguishing outcomes that reflect inherited inequalities and current policies from outcomes that reflect individual school strategies. Capital funding is insufficient to change inherited inequalities, and differential fees and fund‐raising capacities perpetuate inequalities in operational resources. Sharing resources, taxing fee income, and a measure of provincial control over feeder areas could reduce inequalities.  相似文献   

Stable oxygen isotope and pollen records from eastern Scotland and a consideration of Late-glacial and early Holocene climate change for Europe     

GRAEME WHITTINGTON  ANTHONY E. FALLICK  KEVIN J. EDWARDS 《第四纪科学杂志》1996,11(4):327-340

The presence of marl deposits belonging to the Lateglacial period in a former lake basin at Lundin Tower in Fife, Scotland has allowed palaeoenvironmental investigations by means of carbonate δ¹³C and δ¹⁸O, and organic matter δ¹³C, in addition to palynology. The variations that emerge reveal strong similarities between the pollen and isotope records and these are interpreted as reflecting climatic shifts. The classic Late-glacial pattern of Oldest Dryas–Bølling–Older Dryas–Allerød–Younger Dryas may be evident and other climatic oscillations are shown to have occurred not only during the Allerød but also in the Preboreal. The problem of the time discordance between isotopic change and pollen representation is addressed through explanations involving lags in plant colonization. A comparison of the δ¹⁸O records from 43 sites across Europe reveals two different regional patterns, which raises fundamental questions over the nature of Late-glacial palaeoclimates.  相似文献