International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004
Max. Min. Ave. RMS
4.222 -3.644 0.346 z:1.153
Table 8 The accuracy of the DEM(meters)
3.7 The accuracy of the Digital Ortho Map(DOM)
The check point was overlaid on the DOM produced with the
Ikonos stereo image. The distant between the survey point and
its image point was measured, and the errors can then be
calculated(table 9).
Max. Min. Ave. RMS
X 1.6 -1.3 0.09 +0.44
Y 1.4 -1.4 -0.03 +0.54
S +0.70
Table 9 The accuracy of the DOM(meters)
4. CONCLUSION
With the refining of the RPC model, the transformation
between coordinate systems and the development of the block
adjustment of the Ikonos stereo image, the high accuracy
spatial data of wide range in the area where the conditions of
terrain, weather and traffic are all awful has been obtained. The
application of Ikonos stereo image reduces greatly the field
work. It is the best solution to the difficult problem that could
not solve by other survey means. Ikonos has great valuable for
practice indeed.
The practice research of Ikonos positioning and its accuracy in
Tibet proves that:
€ With the refining of the RPC model by the correction
of the bias and drift and the transformation between the
coordinate systems, the relationship between the Tkonos
image space and the national coordinate systems has
been built up. It meets the need of practice application.
€ Without control, the accuracy of Ikonos positioning is
about 10m in plane and less than 10m in height.
€ The accuracy of Ikonos positioning can be improved
greatly by added just one GCP in the area.
€ The location of the GCPs is at will The high
positioning accuracy can be achieved when there are two
GCPs distributed in south-north. There is little
improvement in accuracy to add more GCPs.
€ The accuracy of Ikonos positioning has reached
t0+0.945m in plane ,£0.510m in height, and £1.076m in
total. The RMS of image point is +0.3 pixels.
€ The accuracy of the DOM, DEM produced with Ikonos
stereo image has reached to +0.70m, +1.153m
respectively. The DLG fits the specification of the map
of 1:2000.
Reference:
E. Baltsavias, M. Pateraki, etc, 2001, Radiometric and
Geometric Evaluation of IKONOS Geo Images and Their Use
for 3D Building Modelling, Joint ISPRS Workshop "High
Resolution Mapping from Space 2001", Hannover, Germany,
http://Www.chikatsu-lab.g.dendai.ac.jp/wgv4/presentation/
09 _03Pateraki.PDF
G. Dial, J. Grodecki, 2002, Block Adjustment with Rational
Polynomial Camera Models, ACSM-ASPRS 2002 Annual
Conference Proceedings, Washington DC, USA.
http://www.spaceimaging.com/ whitepapers pdfs.
C. S. Fraser and H. B. Hanley, 2003, Bias Compensation in
Rational Functions for Ikonos Satellite Imagery, PE& RS,69(1),
pp53-58.
J. Grodecki, 2001, IKONOS Stereo Feature Extraction —RPC
Approach. ASPRS, St. Louis, http://Www.spaceimaging.com
whitepapers pdfs.
M. Kumar, O. T Castro, 2001, Practical Aspects of Ikonos
Imagery for Mapping, Paper presented at the 22nd Asian
conference on remote sensing, Singapore, http:
www crisp.nus.edu.sg/~acrs2001/pdf.
T., C. Vincent and Y. Hu , 2001. A Comprehensive Study of
the Rational Function Model for Photogrammetric Processing.
PE& RS, 67(12), pp. 1347-1357.
Zhu Huatong, 1986, The foundation of the Geodetic
Coordinate System, Publishing House of Surveying and
Mapping, Beijing, pp85-87.
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