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