DocumentCode :
1334349
Title :
Multitemporal ERS SAR analysis applied to forest mapping
Author :
Quegan, Shaun ; Le Toan, Thuy ; Yu, Jiong Jiong ; Ribbes, Florence ; Floury, Nicolas
Author_Institution :
Centre for Earth Obs. Sci., Sheffield Univ., UK
Volume :
38
Issue :
2
fYear :
2000
fDate :
3/1/2000 12:00:00 AM
Firstpage :
741
Lastpage :
753
Abstract :
Examination of the physical background underlying the ERS response of forest and analysis of time series of ERS data indicates that the greater temporal stability of forest compared with many other types of land cover presents a means of mapping forest area. The processing chain necessary to make such area estimations involves reconstruction of an optimal estimate of the backscattering coefficient at each pixel using temporal and spatial filtering so that classification rules derived from large scale averaging are applicable. The rationale behind the filtering strategy and the level of averaging needed is explained in terms of the observed multitemporal behavior of forest and nonforest areas, much of this analysis is generic and applicable to a wide range of situation in which significant information is carried by multitemporal features of the data. The choice of decision rules is based on the forest observations, with the added requirement for robustness. The performance of a classifier based only on change is assessed on a range of test sites in the UK, Finland, and Poland. Error sources in this classifier are identified, and the possibility of improving performance by including radiometric information in the mapping strategy is discussed. Brief discussions of how the classification is affected by the addition of coherence and how the processing chain would need to be modified for other forms of satellite data are included
Keywords :
forestry; geophysical signal processing; geophysical techniques; image classification; image sequences; radar imaging; radar signal processing; remote sensing by radar; synthetic aperture radar; vegetation mapping; backscattering coefficient; classification rule; classifier; decision rules; forest; forestry; geophysical measurement technique; image classification; image processing; image sequence; land cover; large scale averaging; multitemporal ERS SAR; radar remote sensing; spaceborne radar; spatial filtering; synthetic aperture radar; temporal filtering; vegetation mapping; Backscatter; Information analysis; Information filtering; Information filters; Large-scale systems; Radiometry; Robustness; Stability analysis; Testing; Time series analysis;
fLanguage :
English
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
Publisher :
ieee
ISSN :
0196-2892
Type :
jour
DOI :
10.1109/36.842003
Filename :
842003
Link To Document :
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