International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B-YF. Istanbul 2004 
  
For the vertical accuracy the type was verified (0.412m<1.8m 
and as it was expected. The type was also verified for the 
horizontal accuracy (1.245m>1.8m), a fact that indicates that 
the orthoimage’s accuracy is bearable according to the technical 
specifications of Hellenic Cadastre. 
4.3. Orthoimage’s accuracy estimation of that was produced 
with the method of GPS 
In this method eight points were used for the control precision, 
which were measured, as mentioned above, with GPS. In this 
method it was calculated that 6,,,=0.505m and 6,,=0.370m for 
the eight points. 
The reliability control for gross errors in the nine control points 
accomplished successfully. There was no necessity to reject any 
point because of the type below: 
OX; , óy; € 1.96 Opor = 0.99m (11) 
As well as the type: 
02;<2.16 6,,= 0.779m (12) 
Continuously a total accuracy control was applied, where the 
following type should be verified: 
Ohr 5 0.920xy = 090 (13) 
And the type 
640.986, = 0.967 (14) 
The type for the vertical accuracy (0.370m<1.8m) was verified 
as well as the type for the horizontal accuracy (0.505m>1.8m), 
fact that indicates that the orthoimage’s accuracy is_bearable 
according to the technical specifications of Hellenic Cadastre. 
5. CONCLUSION 
Underlining the more important points of this research, in 
regard to the possibility of application of panchromatic image of 
satellite IKONOS -2 in the Hellenic Cadastre, judged necessary 
the report of the following conclusions and proposals: 
5.1. First method 
From the panchromatic orthoimage control resulted an 
estimation of total horizontal error equal to 1.245 m while the 
technical specifications of Hellenic Cadastre for suburban 
region (1:5000) is 2m. Obviously the accuracy from the 
orthoimage is acceptable from the Hellenic Cadastre. 
The proposal that can be formulated for this method, in order to 
be the orthoimage production possible in Cadastral applications 
is the following: digitization of cartographic maps in bigger 
166 
scale (for example 1:1000), with a recent syntax (ideal date 
2000, for the particular application, because this is the 
chronology of image reception). 
5.2. Second method 
From the panchromatic orthoimage control resulted an 
estimation of total horizontal error equal to 0,505m while the 
tolerance given by the technical specifications of Hellenic 
Cadastre for this particular region (1:5000) is 2m. We lead to 
the conclusion that is possible to use this orthoimage in the 
Hellenic Cadastre. 
Provided that this method became acceptable from the technical 
specifications of the Hellenic Cadastre, the only proposition that 
can be suggested is: Measurements of as many as possible 
characteristic points (for this region at least 100), aiming at the 
simultaneous production of digital terrain model (DTM), with 
the “stop and go” method. The method “stop and go” provides 
accuracy "unacceptable" for the GPS specifications (0.5m) but 
acceptable accuracy for the particular application with 
simultaneous production of digital terrain model (Pikridas C., 
2001) (Christodoulou K., 2002). 
6. REFERENCES 
Arvanitis A., 2000. Cadastre, Zitis Publications, Thessaloniki 
Christodoulou K., 2002. Combination of satellite image Pan 
IKONOS-2 with GPS in cadastral applications, Graduate 
Thesis, School of Rural and Surveying Engineering, 
TATM,AUTH 
Erdas, 2001. Erdas Field Guide, Fifth Edition 
Mpanta K., Xalkidou M., Xalkidis L., 2001. Combination 
of given pictures IKONOS and photogrammetric 
products for the creation of 3d depiction of 
Campus of AUTH, Graduate Thesis, School of Rural and 
Surveying Engineering, TATM,AUTH 
Ntokou K. -Theodorou M., 2001. Possibility of image data of 
satellite IKONOS in the National Cadastre, Graduate Thesis, 
School of Rural and Surveying Engineering, TATM,AUTH 
Patias P, 2002: Notes for the controls of precision and 
reliability, academic notes, TATM, AUTH. 
Pikridas C., 2001. The satellite system GPS, academic notes, 
TATM, AUTH 
Technical specifications of Hellenic Cadastre, 1999 
Tsakiri — Strati M., 1998. 
TATM, AUTH 
Remote Sensing, academic notes, 
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