Spatial resolution requirements for urban studies

Welch, R.

doi:10.1080/01431168208948387

Cited by 170 publications

(80 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A resolução espacial das imagens serviu, inicialmente, como justificação para todos os problemas encontrados, sendo indicada como o principal factor limitativo em diversos estudos (WELCH, 1982). Contudo, alguns autores (CAE- TANO et al, 1997) têm feito notar que, paradoxalmente, o aumento da resolução espacial pode conduzir a maiores problemas no tratamento numérico de imagens, em função da grande heterogeneidade espectral do meio urbano, que conduz implicitamente a um aumento da variabilidade e, consequentemente, do designado «ruído».…”

Section: Introductionunclassified

Detecção Remota e Sistemas de Informação Geográfica para produção de cartografia de uso e ocupação do solo

Rocha

2012

FIT

View full text Add to dashboard Cite

Resumo -A principal finalidade da metodologia apresentada neste documento é a criação e a validação, através da aplicação a um caso de estudo, de uma forma eficiente de classificação de imagens de satélite, que integra informação auxiliar (dados dos Censos, do Plano Director Municipal e a rede viária) e dados provenientes de Detecção Remota, num Sistema de Informação Geográfica. O procedimento desenvolvido segue uma estratégia de classificação por níveis, sendo composto por três etapas principais: Estratificação pré-classificação; Aplicação dos classificadores de Bayes e de Máxima Verosimilhança (MV); Aplicação de regras de pós-classificação. As abordagens comuns incorporam os dados auxiliares antes, durante ou depois da classificação. No método proposto recorre-se a esse tipo de informação em todas as etapas. O método consegue, globalmente, melhores resultados que os classificadores clássicos: Mínima Distância, Paralelepípedo e Máxima Verosimilhança (MV). Além disso, melhora substancialmente a exactidão das classes onde o processo de classificação faz uso da informação auxiliar.Palavras-chave: Sistemas de Informação Geográfica (SIG), detecção remota, informação auxiliar. Abstract -REMOTE SENSING AND GEOGRAPHIC INFORMATION SYSTEMS IN THE PRODUCTION OF LAND USE MAPS.The main purpose of this research is to develop and validate an efficient form of satellite image classification that integrates ancillary information (Census data; the Municipal Master Plan; the Road Network) and remote sensing data in a Geographic Information System. The developed procedure follows a layered classification approach, comprising three main stages: Pre-classification stratification; Application of Bayesian and Maximum-likelihood classifiers; Post-classification sorting. Common approaches incorporate the ancillary data before, during or after classification. In the proposed method, all the steps take the ancillary information into account. The proposed method achieves, much better classification results than the classical, one layer, Minimum Distance and Maximum-likelihood (ML) classifiers. Also, it greatly improves the accuracy of those classes where the classification process uses the ancillary data.

show abstract

Section: Introductionunclassified

Detecção Remota e Sistemas de Informação Geográfica para produção de cartografia de uso e ocupação do solo

Rocha

2012

FIT

View full text Add to dashboard Cite

show abstract

“…Much research has been conducted on identifying the 'optimal' spatial resolution for a particular purpose or investigation, where there is a prior assumption that the features under investigation are scale-dependent. For example, Welch (1982) simply used the minimum mappable unit of urban land cover to estimate the most appropriate spatial resolution. Alternatively, images produced by sensors with different spatial resolutions have been compared to establish which is most suitable for a particular purpose (e.g.…”

Section: Spatial Variabilitymentioning

confidence: 99%

On scales and dynamics in observing the environment

Aplin

2006

International Journal of Remote Sensing

View full text Add to dashboard Cite

Natural and anthropogenic processes at the Earth's surface operate at a range of spatial and temporal scales. Different scales of observation are required to match the spatial scales of the processes under observation. At the same time, the temporal sampling rate of the observing systems must be reconciled with the dynamics of the processes observed. Bringing together these issues requires insight, innovation and, inevitably, compromise. This paper reviews spatial and temporal considerations in remote sensing and introduces the papers in this Special Issue on 'Scales and Dynamics in Observing the Environment'. The review comprises three main sections. The first section focuses on spatial variability in remote sensing, while the second section focuses on temporal variability in remote sensing. The third section links these two issues, focusing on the interplay of space and time in remote sensing. The review is primarily theoretical, explaining spatial and temporal properties of remote sensing and remotely sensed phenomena. Where appropriate, however, practical examples are included to demonstrate how remote sensing is used in environmental applications. Following the review, the papers included in the Special Issue are introduced, outlining their significance in the context of 'Scales and Dynamics in Observing the Environment'.

show abstract

“…L'information révélée par la télédétection correspond, dans la plupart des cas, au rayonnement solaire réfléchi par la surface terrestre dans différentes bandes du spectre électroma-gnétique et permet l'identification des divers éléments occupant cette surface. Les premiers satellites ont été conçus pour étudier les ressources naturelles de vastes territoires et ne répondaient pas adéquatement à l'observation du milieu urbain (Forster, 1985;Welch, 1982). La deuxième génération de satellites, caractérisée par une pi us fi ne résolution spatiale, ouvre de nouvelles perspectives dans le domaine de la gestion de l'information urbaine; elle permet d'élaborer de nouveaux produits, les spatio-cartes, qui associent des variables topo-cartographiques aux données satellitaires.…”

unclassified

Développement d’une spatio-carte orientée vers la planification urbaine : résultats préliminaires

Charbonneau¹,

Coulombe²,

Morin³

et al. 2005

cgq

View full text Add to dashboard Cite

L'administration municipale nécessite le développement d'outils adaptés à la gestion de l'information urbaine. Dans un tel contexte, la télédétection est une nouvelle source d'information appelée à faciliter la planification urbaine. Le satellite SPOT avec une résolution spatiale de 10 m en mode panchromatique et de 20 m en mode multibande répond aux spécifications spatiales des études en aménagement urbain. Le but de cette recherche est de produire une spatio-carte en combinant des informations cartographiques aux données SPOT. La base du document est une image satellitaire améliorée radiométriquement et corrigée géométriquement à laquelle on superpose des informations géocodées. La démarche méthodologique utilisée pour la production d'une spatio-carte est présentée. On discute également de la pertinence d'un tel document dans la gestion municipale. La zone test est l'agglomération de Sherbrooke (Québec).Municipal administration requires the development of tools adapted to the management of urban information. In this context, remote sensing constitutes a new source of information useful in urban planning. The SPOT satellite, with a spatial resolution of 10 m in panchromatic mode and 20 m in multiband mode, meets the spatial specifications required in the context of urban planning studies. The objective of this research is to produce a spatial map by integrating cartographic information and SPOT data. The base of the document is a radiometrically and geometrically corrected satellite image to which geocoded data is integrated. The methodology used for the production of the spatial map is outlined. The relevance of such a document in the field of municipal management is discussed. The test site chosen for the study is the city of Sherbrooke (Québec)

show abstract

Spatial resolution requirements for urban studies

Cited by 170 publications

References 2 publications

Detecção Remota e Sistemas de Informação Geográfica para produção de cartografia de uso e ocupação do solo

Detecção Remota e Sistemas de Informação Geográfica para produção de cartografia de uso e ocupação do solo

On scales and dynamics in observing the environment

Développement d’une spatio-carte orientée vers la planification urbaine : résultats préliminaires

Contact Info

Product

Resources

About