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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.