«Top-most layer?
.700.558,974 4.
ield Value
Class value 2
Pixel value 10,889999
Figure 17. Differences between two DEMs (test 2)
It is interesting to note in the profile of figure 14 the difference
of height both in the profile and in the map of the height
differences, between the DEM of different time, after the
construction of new building for a Mall.
4. CONCLUSION
In conclusion, the present testing has verified the procedure for
the extraction of DEM from only satellite stereo images by
using both the parameters supplied with the stereo pair (RPC)
and the ground control points.
The second set of tests, in addiction, shows very good results in
extraction of DEM both in Aerial photogrammetric method and
in Lidar method.
The availability of GeoEye-1 stereo pair allows new tests
which are still in progress and the results encourage further tests
that compare images taken at different times for the detection of
changes especially in the modification of the DEM in order to
know immediately the consequences of natural disasters or in
search of environmental abuse.
5. BIBLIOGRAPHY
Baudoin,A., Goudy, P., Rouze, M. (2001): The Pleiades
Program, Joint ISPRS Workshop “High Resolution Mapping
from Space 2001", Hannover 2001, on CD
Dial, G., Grodecki, J. (2002): IKONOS Accuracy without
Ground Control, Pecora 15 / Land Satellite Information IV /
ISPRS Com. I, Denver 2002, on CD
Grodecki, J. (2001): IKONOS Stereo Feature Extraction — RPC
Approach, ASPRS annual conference St. Louis, 2001, on CD
Jacobsen, K. (2002): Mapping with IKONOS Images, EARSeL,
Prag 2002“Geoinformation for European-wide Integration"
Millpress ISBN 90-77017-71-2, pp 149 — 156
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B7, 2012
XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia
Jacobsen, K. (2003): DEM Generation from Satellite Data,
EARSeL conference Ghent 2003
Hanley, H.B., Yamakawa. T., Fraser, C.S. (2002): Sensor
Orientation for High Resolution Imagery, Pecora 15 / Land
Satellite Information IV / ISPRS Com. I, Denver 2002, on CD
M. Crespi P. Capaldo F. Fratarcangeli A. Nascetti F. Pieralice.
"Dsm generation from very high optical and radar sensors:
problems and potentialities along the road from the 3d
geometric modeling to the surface model". In proceedings
IGARSS, Honolulu, Hawaii, USA, Luglio 2010
M. Crespi P. Capaldo F. Fratarcangeli A. Nascetti F. Pieralice.
"Matching strategies for DSMs exstraction in urban area from
high resolution satellite imagery". In proceedings EARSel
Workshop, Ghent, Belgio, Settembre 2010
M. Crosetto, F. Pérez Aragues, Radargrammetry and SAR
interferometry for DEM generation: validation and data fusion,
Proceedings of CEOS SAR Workshop, ESA-CNES, Toulouse,
France, 1999.
F.W. Leberl, Radargrammetric image processing, Artech
House, Norwood, USA, 1990.
Z. Li, Q. Zhu, C. Gold, Digital terrain modeling: principles and
methodology, CRC Press, Florida, USA, 2005.
S. Méric, F. Fayard, E. Pottier, Chapter 20 - "Radargrammetric
SAR image processing" In: Pei-Gee Peter Ho (Eds.),
Geoscience and Remote Sensing, Intech, 2009.
H. Raggam, R. Perko, K. Gutjahr, Investigation of the Stereo-
Radargrammetric Mapping Potential of TerraSAR-X,
Proceeding of the 29th EARSeL Symposium, Chania, Greece,
pp. 371 — 380, 2009.
T. Toutin, L. Gray, State-of-the-art of elevation extraction from
satellite SAR data, ISPRS Journal of Photo-grammtery &
Remote Sensing 55, ELSEVIER, pp. 13-33, 2000.
6. ACKNOWLEDGEMENTS
The authors thank the SIT s.r.l. Noci (BA) for collaboration in
the test run, the company Planetek of Bari and the Dipartimento
di Geologia e Geofisica University of Bari.
