EVALUATION OF POSSIBILITY OF ORTHO IMAGERY PRODUCTION 
USING SPOT5 SINGLE IMAGE 
Joon-Mook Kang 3 , Hee-Cheon Yoon 3 , Joon-Kyu Park 3 
d Department of Civil Engineering, College of Engineering, Chungnam National University 
220, Gung-dong, Yuseong-gu, Daejeon, ROK - (jmkang, hcyoon, surveyp)@cnu.ac.kr 
Commission IV, WG IV/9 
KEY WORDS: Ortho Imagery, Digital Map, Accuracy Analysis, Layer, SPOT5 
ABSTRACT: 
As availability of high-resolution satellite imagery increases, the interests on the image maps using satellite imagery have been 
focused the production of thematic maps or accuracy improvement of digital maps. This research evaluated accuracy of the ortho 
images by comparing ortho imagery generated from SPOT5 single image with existing digital map by Korea National Geographic 
Information Institute. In this research, ortho imagery was produced using single image of SPOT5 satellite imagery. The accuracy 
analysis with 10 check points of respective layers of roads, streams, and structures was conducted. Although the research showed 
that ortho imagery acquired by single image had lower accuracy, it was evaluated to be more effective considering the economical 
effectiveness and applicability. With satellite imagery of higher spatial resolution, it can be effectively applied in production of 
larger scale ortho imagery maps. 
1. INTRODUCTION 
Recently according to supplying high resolution satellite 
imagery, we take much interest in the update and the revision of 
digital map and thematic map based on the satellite images. The 
ortho imagery mapping on the existing method extracted 
DEM(Digital Elevation Model) using stereo satellite images 
and used it for correction of satellite images. However, it is true 
that stereo image is not only expensive but also difficult to 
acquire images which were corresponded with an objective 
region and time. 
Thus, in this research, ortho imagery using single image of 
SPOT5 satellite imagery and existing digital maps to overcome 
restriction of objective images acquirement was produced and 
accuracy analysis for utilization assessment of it was performed. 
And a scale 1 to 5,000 digital map which was produced 
National Geographic Information Institute of Korea for the 
orthorectification was used. The accuracy analysis for ortho 
imagery generated from SPOT5 single image was performed on 
the basis of a scale 1 to 25,000 digital map produced by 
National Geographic Information Institute of Korea. It would be 
presented the utilization possibility in the production and a 
revision of the digital map using SPOT5 single image. 
2. SUBJECT MATTER AND METHOD 
Observation images from the earth observation satellite 
generally have geometric distortions. These distortions mainly 
were caused by the earth curvature and rotation, satellite 
attitude and altitude, geometric characteristics of sensor and etc. 
Therefore satellite images with geometric distortions showed a 
different topography from reality. 
In this research, we will attempt to evaluate the utilization 
possibility of ortho imagery generated from SPOT5 single 
image for the mapping and a map revision. For this, precise 
geometric correction using ground control points were 
performed to remove these distortions. And digital elevation 
model was generated from elevation data of 1 to 5,000 scale 
digital map produced by the National Geographic Information 
Institute of Korea. The accuracy analysis for ortho imagery 
generated from SPOT5 single image was performed on the 
basis of 1 to 25,000 scale digital map produced by National 
Geographic Information Institute of Korea. Then 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. 
Figure 1. Research flowchart