Proceedings of the Symposium on Global and Environmental Monitoring: Proceedings of the Symposium on Global and Environmental Monitoring

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Persistent identifier:: 856665355

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts ; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856665355

Language:: English

Document type:: Multivolume work

Volume

Persistent identifier:: 856669164

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Scope:: XIV, 912 Seiten

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856669164

Illustration:: Illustrationen, Diagramme, Karten

Signature of the source:: ZS 312(28,7,1)

Language:: English

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

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:: [THP-2 GIS INTEGRATION]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: INFORMATION EXCHANGE VERSUS DATA TRANSLATION. Dr. Pamela Sallaway

Document type:: Multivolume work

Structure type:: Chapter

612 Application Entities Within each application that uses GIS, there are application entities that require modelling. Most applications model the elevation of the earth’s surface. Foresters model stands and openings; municipalities model parcels and road networks; fisheries experts model watersheds and stream networks. All of these are called application entities. In addition to extracting the application entities, other design decisions are made at the application level. These include accuracy requirements, units of resolution of both graphic and non-graphic data, coordinate definitions in terms of projection, spheroid and datum. e.g., between rivers, highways, lakes. Features are often classified according to the complexity of information required to represent their positions as: • Point features such as manholes or well sites. • Linear features such as a roads or streams. • Polygonal features such as lakes. GIS Constructs Application entities require a GIS construct to represent them. Most such entities can be represented by either surfaces, features, or a combination of both. A surface defines a single value for every position within an area of interest. Common GIS surfaces include elevation, slope, aspect. These varieties of surfaces have been computer-modelled for many years. More recently, with the advent of imagery, other surfaces are becoming prevalent - including not only raw or geocoded image data, but also resultant surfaces such as vegetation indices. A second type of GIS construct is a feature, representing a distinct geographic object. Most applications require differentiation between various features;

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