×

You are using an outdated browser that does not fully support the intranda viewer.
As a result, some pages may not be displayed correctly.

We recommend you use one of the following browsers:

Full text

Title
Proceedings, XXth congress


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,
TR L^ MW uus NON FAS
my C5 rs sn M