International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004 
  
2. GROUND CONTROL POINTS 
Ground control points were established in order to produce 
1/5000 scale standard maps by photogrammetric mapping 
method. All control points are signalized and measured by 
GPS. In the project area there are14 signalized ground control 
points. After adjustment of GPS measurements accuracy of 
ground control points less then 10 cm. All control points in 
test area re-signalized for the satellite imaging. Signalization 
dimensions are shown below figure. After signalization of 
that control points satellite images were provided from INTA 
Company. 
  
  
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Figure 1- Ground Control Points 
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Figure 2- Signalization of GCP's 
3. SATELLITE IMAGES SPECIFICATIONS 
A pair of stereo images provided free of charge by INTA 
Space Company in order to use test works. Image overlaps is 
9,100 and time interval between two image around | 
minutes. Ground resolution of first image is on cross track 
0.88 m and on track 0.85 m. Scanning azimuth 179.96 
degrees, nominal data collection azimuth 78.6370 degrees, 
nominal data collection elevation is 74.57693 degrees. 
Azimuth of sun is 134.9709 degrees and sun elevation 
68.83922 degrees during scanning. Ground resolution of 
second image is on cross track 0.92 m and on track 1.02 m. 
Scanning azimuth 179.96 degrees, nominal data collection 
azimuth 163.4890 degrees, nominal data collection elevation 
is 62.21244 degrees. Azimuth of sun is 135.4087 degrees 
and sun elevation 68.95507 degrees during scanning. 
Pan Sharpened stereo images covered whole test area. 
Geometric resolution is 1 meter and spectral resolution is 4 m 
of those images. More information about Ikonos images 
please visit; http://www .spaceturk.com.tr 
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4. TEST PHASES 
4.1 ACCURACY INVESTIGATION 
Inside the test area, two different sub areas have been chosen 
for accuracy investigation. One of the regions has very dense 
parcels, flat area, definition and identification of boundaries, 
details would be easier and will be called 4B area. Second 
region has mountainous, forestry related parcels, definition 
and identification of boundaries, details would be harder and 
will be called 9B area. 
4.1.1 Preliminary Investigation Of Images 
SOCET SET V.4.4.2, ERDAS IMAGINE V8.5, V8.6 and 
PCI GEOMATIC V7.2 software were used for different 
purposes during test phase. 
Before starting test phase, satellite images investigated 
detailed and realized following findings; 
> Size of each part of Pan-Sharpened stereo images with 
1 meter ground resolution is around 400 MB, 
» There is a specific file called RPC contains sensor 
parameters, meta data and other information, 
Images covered whole test area, 
» All signalized ground control points are identified and 
defined, 
Some part of test area covered by clouds and there is no 
information about terrain on the cloudy area, 
» Some milky areas has a little terrain information which 
can interpretable, 4 
» There is sun light reflection on the building roof surface 
on settlement area., so it is not possible to collect data 
about these buildings, 
> Linear features such as parcel boundaries can 
interpretable but attributes of linear features can not be 
defined such as fence, hedge and so on, 
> Some of linear features presents is around 3-4 pixels. It 
seems a gap between linear features. So, It needs a 
special experience to identity if is it patches or drainages 
and so on, 
> Some details for example fountain, communication line 
pillar, power line pillar in the settlement area can not be 
seen on the satellite images, 
> Main power line and its pillar can be seen easily and 
identified very well, 
> In very dense agricultural area parcel boundaries can be 
identified exactly, 
» [n mountainous and forestry related area, definition and 
identification of parcel boundaries and its details can be 
very hard. 
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4.1.20rientation Of Images By GCP’ s 
There are 14 ground control points in the test area. Ground 
control points datum is European Datum 1950 (ED50). All 
control points measured on images. We used DLT (Direct 
Linear Transformation) for image orientation. Orientation 
results are shown below;