Abstract A comparison is in progress of the use SPOT (winter and summer) and TM data (summer) to map land use patterns in Johannesburg (a complex but stable environment) and Sandton (an area on the developing urban fringe). A semisupervised classification technique is used to define the spectral signatures of the relevant cover types. A map of such spectral cover classes does not necessarily result in a useful map of urban land use classes. The cover classes are therefore reclassified contextually into urban classes by means of a special coropleth classifier. This classification differs from the conventional in that the features are spectral class frequencies rather than radiances. The product is an objective map of urban land use classes coinciding with the visual patterns shown by cover classes. Panchromatic SPOT imagery and derivatives, as well as map data were combined with classified multispectral SPOT and TM data to produce products simplifying visual analysis.
Spectral-contextual classifications of SPOT and Landsat TM data for analysis of the Johannesburg urban area
Advances in Space Research ; 9 , 1 ; 121-124
1989-01-01
4 pages
Article (Journal)
Electronic Resource
English
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