Remote sensing for resources development and environmental management: Remote sensing for resources development and environmental management

damen, m. c. j.

Bibliographic data

Multivolume work

Persistent identifier:: 856342815

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A. A. Balkema

Identifier (digital):: 856342815

Language:: English

Additional Notes:: Volume 1-3 erschienen von 1986-1988

Editor:: Damen, M. C. J.

Document type:: Multivolume work

Volume

Persistent identifier:: 856641294

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Scope:: IX Seiten, Seiten 551-956

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A,. A. Balkema

Identifier (digital):: 856641294

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(26,7,2)

Language:: English

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: Damen, M. C. J.

Editor:: International Society for Photogrammetry and Remote Sensing, Commission of Photographic and Remote Sensing Data

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: 7 Human settlements: Urban surveys, human settlement analysis and archaeology. Chairman: W. G. Collins, Co-chairman: B. C. Forster, Liaison: P. Hofstee

Write comment:: Wegen zu enger Bindung kommt es teilweise im Original zu Textverlust.

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: Visual aerial photograph texture discrimination for delineating homogeneous residential sectors: An instrument for urban planners. Maria de Lourdes Neves de Oliveira

Document type:: Multivolume work

Structure type:: Chapter

809 Symposium on Remote Sensing for Resources Development and Environmental Management / Enschede / August 1986 Visual aerial photograph texture discrimination for delineating homogeneous residential sectors: An instrument for urban planners Maria de Lourdes Neves de Oliveira Instituto de Pesquisas Espaciais/MCT, Sâo José dos Campos-SP, Brazil ABSTRACT: This paper presents a method for the definition of a geographical reference system to be used by planners in urban residential area analysis. The purpose of the method is to exploit, in the diagnosis, the spatial component of the town which is the concrete result of the interactions between its physical and social elements. The assumptions made are: a) the urban residential areas in Brazilian towns are extremely differentiated as a result of the social stratification existent in the country; b) there is a strong association between physical aspects of these areas and the socioeconomic characteristics of their resident population. The method preconizes the use of panchromatic aerial photographs at a scale of 1:10000 for the delimitation of homogeneous residential sectors. The procedures described are based on the human visual capability to descriminate different textures. In order to test its validity, survey data obtained through its application tq Sao José dos Campos, SP, Brazil, were analysed using cluster analysis technique. The results of the work showed that photointerpretation, besides being a quick and economical instrument for urban analysis, may be usefully applied for delineating homogeneous residential urban sectors, to be used by urban planners. 1 INTRODUCTION Urban planning, as any decision-making process, depends on an efficient information system for support. Urban system related decisions, specifically, require the availability of a wide range of information, particularly those associated with an appropriate geographic reference, that allows the orientation of specially located actions. Among these types of information we would mention that related to the residential differentiation on urban soil, the corresponding distribution of the different populational segments on this soil, as well as its socioeconomic features. Such information is essential for the planning of residential areas that involve, among others, decisions related to the placement of locally used urban equipment, as well as to the distribution of determined urban services. The present paper suggests a method for defining the urban residential sectors aiming at assisting the planner in the analysis of the town residential areas that directs him towards the study of problems which require all of the above mentioned information at the same time. This method was developed having in mind the Brazilian towns with their extremely diversified compositions of residential areas resulting from the pronounced stratification of their society 2 DESCRIPTION OF THE METHOD This method is based upon visual photograph texture discrimination over panchromatic aerial photographs on the scale of 1:10.000. When town areas of residential use are investigated, the sectors with similar textures are delineated, thus forming urban units for data collection, analysis and storage. Its result is a mosaic map, built up from small differentiated parts, in which neighboring sectors will show different textures. This proposal is based upon the hypothesis that to these neighboring homogeneously textured sectors correpond different physical residential environments, to which correspond populational segments also differentiated according to their socioeconomic features. The basic element of the aerial photographs for delineating homogeneous residential sectors is the texture, produced by the aggregation of small details, no longer analysed individually, but as a whole. The capacity of the human visual system to perceive differences between determined textures is fundamental to the suggested sectorization process. According to Haralick (1979) the texture is a phenomenon of area organization and has two basic dimensions: a) one that refers to the primary elements that composes it; and b) one that refers to the dependency among primary components, i.e., their spatial organization. This being so, texture variation is defined by different primary components or by components of different sizes, and also by the density of these elements, their relative position and their spatial distribution. In residential areas this means that the textures of the sectors are type-depending: mansions are different from small houses; one-store> houses are different from apartment houses; high density areas are different from low density areas; arboreous areas are different from areas without vegetation; areas for exclusively residential use are different from mixed use areas. And so are their textures. Basically, the process of delineating homogeneous sectors consists of the following: a) Visual discrimination of the different texture areas through an overall perception of adjacent point sets. b) Identification, within these areas,of the primary components of the textures as well as the spatial organization, investigating urbanistic and architetonic details of their elements, such as sizes of buildings and open areas, maps of the road system, existence of natural greenery, building density, nonresidential constructions. c) Determination of whether there is differentiation between textures of visually discriminated areas based upon information collected from item (b). d) Outlining of the limits that define the residential sectors of the same texture.

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