relief areas for geocoding would give great flexibility
for image fusion.
It appears that there is no clear advantage in any
particular filter but that attention needs to be paid to
blunder detection.
The sources of error in the stereo modelling process
may be atrributed to a number of causes which
include errors in azimuth timing and range. Such
errors are not necessarily due to poor orbit
determination or errors in the SAR processor but
maybe due to the presentation and interpetation of the
data in the header. Errors could also be due to weak
geometry and measuring errors in the image. Future
work will concentrate on making the optimum use of
the header data available and improving the geometry
of the viewing and tie point measurement. Roll-tilt
data will be used and the model developed to include
the provision for the use of more than two images. In
the longer term other data such as SPOT could also be
used in the same geometric model.
ACKNOWLEDGEMENTS
The data used in the work discussed in this paper was
provided by ESA to University College London as
principlal investigators for ERS-1 and as participants
in the OEEPE/GeoSAR test of geocoding SAR data.
The geocoding software was used with permission of
GEC Marconi Research Centre who develped the
software for the Defence Research Agency. The
assistance of these three bodies, and of DLR,
Oberpfaffenhofen is much appreciated.
REFERENCES
Chen Pu-Huai, 1993. Extraction of three dimensional
data from European ERS-1 Synthetic Aperture
radar imagery. MSc report, University of
London. 82 pages.
Clark C, 1991. Geocoding and stereoscopy of
Synthetic Aperture Radar. PhD Thesis,
University of London.
Clochez O, 1993. Speckle noise reduction and
stereomatching in ERS-1 SAR imagery.
Training period report, UCL/ENSTBr Erasmus
programme.
Denos M, 1991. An automated approach to stereo
matching Seasat imagery. Proceedings of
British Machine Vision Conference, Glasgow,
1991. Springer-Verlag
Dowman I, Clark C and Denos, 1992. Three
dimensional data from SAR images. Int Arch.
of Photogrammetry and Remote Sensing,
24(B4):425-427.
442
Dowman I, Laycock J, Whalley J, 1993a. Geocoding
in the UK. SAR Geocoding:Data and Systems.
Wichmann, pp 373-388.
Dowman I, Upton M, de Knecht J and Davison C,
1993b. Preliminary studies on the application
of ERS-1 data to topographic mapping. Proc. of
First ERS-1 Symposium, Cannes 1992. ESA
SP-359:543-549
Dowman I, Chen Pu-Huai, Clochez O, Saundercock
G,1994. Heighting from stereoscopic ERS-1
Data. Proc of 2nd ERS-1 Symposium,
Hamburg, 1993. ESA SP361,pp 609-614.
NASDA 1992, User's Guide for JERS-1 SAR Data
Format, 1st edition.
Leberl F, 1990. Radargrammetric Image processing.
Artech House Inc., Norwood, USA.
Renouard L and Perlant F, 1994. Geocoding SPOT
products with ERS-1 Geometry. Proc of 2nd
ERS-1 Symposium, Hamburg, 1993. ESA SP-
361, pp653-658
Shimada, M, 1993, User's Guide to NASDA's SAR
Products, EarthObservation Center, National
Space Development Agency of Japan, HE93014
Rev.0..ex
Winter R, Kosmann D, Schulx B-S, Sties M,
Wiggenhagen M, 1993. Radarmap of Germany
- first mosaic and classification. Proc. of First
ERS-1 Symposium, Cannes 1992. ESA SP-
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