COMBINATION OF SATELLITE IMAGE PAN IKONOS - 2 WITH GPS IN CADASTRAL 
APPLICATIONS 
K. Christodoulou *, M. Tsakiri-Strati " 
Post graduate student in Aristotle University of Thessaloniki, School of Rural and Surveying Engineering, Department of Cadastre, 
Photogrammetry and Cartography 
" Associate professor, Aristotle University of Thessaloniki, School of Rural and Surveying Engineering, Department of Cadastre, 
Photogrammetry and Cartography 
KEY WORDS: Accuracy, Cadastre, IKONOS, Rectification, Remote Sensing. 
ABSTRACT 
In this paper is investigating the possibility of the application of panchromatic image, with spatial analysis | meter, from the satellite 
IKONOS-2 in the Hellenic Cadastre for suburban regions. This possibility is estimated via the technical specifications of the Hellenic 
Cadastre. 
For the achievement of this aim, two orthoimages were produced with two different methods. The first method led to an orthoimage 
production by using control points that were received from map digitization in scale 1:5000, while the second method led to an 
orthoimage production using control points that were received from measurements, which were realized with the Global Positioning 
System (GPS). The application aim of these two methods was on the improvement of orthoimage accuracy with the second method 
as well as the two methods evaluation. Moreover, the two orthoimages' accuracy was estimated based on the technical specifications 
of the Hellenic Cadastre for suburban regions. Finally the two methods were evaluated taking into consideration the results for the 
orthoimages accuracy and the technical specifications of Hellenic Cadastre for suburban regions. 
1. INTRODUCTION 2. AREA OF INTEREST AND DATA DESCRIPTION 
The object of this paper is the estimation of the potential use of The area of interest is the Prefecture of Thessaloniki and in 
satellites panchromatic images, from satellite IKONOS-2 in particular southeastern department of the municipality of Pylaia. 
cadastral applications for suburban regions, where the cadastral The study region covers an area approximately 5km x 5km and 
maps' designing scale is 1:5000. can be characterized as suburban with few buildings and soft 
slope. (Figure 1) 
For the realization of this, two orthoimages were produced ; 
using two different methods. The first method led to an 
orthoimage production using control points that were received 
with map digitalization in scale 1:5000, while second led to an 
orthoimage production using control points that were received 
by measurements realized with the Global Positioning System 
(GPS). 
The application aim of the two methods, in receiving the control 
points’ coordinates was the improvement of the orthoimage’s 
accuracy. Therefore, GPS was used in order to measure control 
points. 
The data that was used were one panchromatic image, with 
spatial analysis 1 meter, from the satellite IKONOS-2, that was 
acquired in March 2000, the region's Digital Terrain Model 
(DTM), a surveying diagram of the same area in scale 1:5000 of 
the year1978 and the coordinates of 7 points in Hatt projection 
of the national network. 
The software that used was the following: 
e Erdas Imagine 8.5 (for image rectification) 
e  Microstation 795 (for the coordinates reception of 
control points with digitalization) 
e Leica Ski Pro (for the coordinates reception of control 
points measured with GPS) 
eo ISTOS 2000 (for the various transformations from one 
projection to another) 
  
Figure 1. The area of interest 
The data that were used for this application are the following: 
e The panchromatic image with one-meter spatial analysis 
and with one band from satellite IKONOS-2, which was 
received in March 2000. The image's radiometric analysis was 
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