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The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B4. Beijing 2008 
3. IMAGE PROCESSING AND ACCURACY ANALYSIS 
3.1 Image Processing 
In this research, ISAT, MTA, ISBR and IA software which was 
related Image Station Z of Intergraph Corporation was used for 
image processing of SPOT5 satellite image. Especially 
ISBR(Image Station Base Rectifier) software was used for 
generation of ortho image from SPOT5 single image. Table 1 
shows the program which was related Image Station Z. Figure 2 
shows the system of Image Station Z and figure 3 shows a part 
of ortho image generation process from an SPOT5 image by 
ISBR software. 
Item 
Program 
Function 
Composition of Project & 
Model 
ISAT 
. Data composition related project 
Orientation 
. Execution of orientation 
Triangulation 
. Auto triangulation 
Display and Mapping oi 
3D Stereo Model 
ISSD, 
ISFC 
. Generated stereo model display 
. Generation & editing of vector 
components 
DEM Generation 
MTA 
. Generation of DEM 
Data Processing 
IA 
. Image processing and analysis 
Ortho Image Production 
ISBR 
. Ortho image production 
Table 1. Related programs 
Figure 2. Image Station Z 
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Figure 3. A part of ortho image generation 
Ortho rectification was necessary to achieve ortho image from 
finished image of geometric correction. DEM(Digital Elevation 
Model) of research area was generated by MTA(MGE Terrain 
Analyst) software using 3D contours data of 1:5,000 scale 
digital map produced by National Geographic Information 
Institute of Korea. Resolution of grid model arranged 5m which 
was contour interval of digital map. Figure 4 and figure 5 shows 
respectively grid model and shaded relief model of research 
area. 
Figure 4. Grid model 
Figure 5. Shaded relief model 
3.2 Accuracy Analysis 
In this research, 1:25,000 scale digital map produced by 
National Geographic Information Institute of Korea was used to 
analyze accuracy for ortho imagery generated from SPOT5 
single image. And the existing regulations and the law of 
mapping which was notified by the National Geographic 
Information Institute of Korea were used as a reference data. 
The accuracy analysis for 30 check points which were selected 
in satellite image of the research area was performed. And these 
works with respectively 10 check points of layer of roads, 
streams, and structures was conducted. Table 1~3 indicates the 
results of the accuracy analysis of positioning for respective 
layers of roads, streams, and structures.