Change Detection
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11. OGC. OGC Adopts ebRIM for Catalogues. http://www. opengeospatial.org/pressroom/pressreleases/655. Accessed 13 Sept 2007
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Change Detection J ÉRÔME T HÉAU GIS Training and Research Center, Idaho State University, Pocatello Idaho, ID, USA
Catalogue Information Schema Catalogue Information Model
Catalogue Metadata Schema Catalogue Information Model
Category, Geographic; RDF Geospatial Semantic Integration
Synonyms Detection of changes; Digital change detection methods; Land cover change detection Definition Change Detection can be defined as the process of identifying differences in the state of an object or phenomenon by observing it at different times [1]. This process is usually applied to earth surface changes at two or more times. The primary source of data is geographic and is usually in digital format (e. g., satellite imagery), analog format (e. g., aerial photos), or vector format (e. g., feature maps). Ancillary data (e. g., historical, economic, etc.) can also be used.
Central Perspective Photogrammetric Methods
Central Projection Photogrammetric Methods
Centrographic Measures CrimeStat: A Spatial Statistical Program for the
Analysis of Crime Incidents
CGI Web Mapping and Web Cartography
CGIS Geocollaboration
Chain Spatial Data Transfer Standard (SDTS)
Historical Background Change detection history starts with the history of remote sensing and especially the first aerial photography taken in 1859 by Gaspard Felix Tournachon, also known as Nadar. Thereafter, the development of change detection is closely associated with military technology during world wars I and II and the strategic advantage provided by temporal information acquired by remote sensing. Civilian applications of change detection were developed following these events in the 20th century using mostly interpretation and analog means. However, civilian availability of data was limited until the 70’s and 80’s due to military classification of imagery. The development of digital change detection era really started with the launch of Landsat-1 (called first: Earth Resources Technology Satellite) in July 1972. The regular acquisition of digital data of the earth surface in multispectral bands allowed scientists to get relatively consistent data over time and to characterize changes over relatively large area for the first time. The continuity of this mission as well as the launch of numerous other ones ensured the development of change detection techniques from that time. However, the development of digital change detection techniques was limited by data processing technology capacities and followed closely the development of computer technologies. The situation evolves from the 1960’s when a few places in the world were equipped with expensive computers to the present when personal computers are
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Change Detection
fast and cheap enough to apply even complex algorithms and change detection techniques to satellite imagery. The computer technology also evolved from dedicated hardware to relatively user-frien
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