Journal of Korean Society for Geospatial Information Science (대한공간정보학회지)

Korea Spatial Information Society (대한공간정보학회)
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Analysis of Spatial Resolution Characteristics for DMC/UlatraCamXp/ADS80 Digital Aerial Image Based on Visual Method

시각적 기법에 의한 DMC/UlatraCamXp/ADS80 디지털 항공영상의 공간해상도 특성 분석

  • Received : 2016.02.16
  • Accepted : 2016.03.03
  • Published : 2016.03.31
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Abstract

Digital aerial images have been commonly used in a large scale map production owing to their excellent geometry, and high spatial and radiometric resolution in recent years. However, a quality verification process for acquired images should be preceded in order to secure the high precision and reliability of produced results. Several experimental studies to verify digital imaging systems have been vigorously researched by constructing permanent test field in abroad. On the other hand, it is urgently necessary to suggest a practical scheme for an image quality verification, because this related study and experiment are still in its early stage at home. Hence, this study aims to present an easy method to measure the spatial resolution of the image in a visual way using a portable Siemens star. The images used in the study were obtained with three different cameras, two frame array sensors of DMC, UltraCamXp and a linear array sensor of ADS80. The Siemens star target appeared in every image is extracted and then the spatial resolution of image is compared with theoretical GSD(Ground Sample Distance) by a visual method. In addition, the change of spatial resolution depending on the location of the Siemens star from image center and flight direction and cross-flight direction is also compared and analyzed. As study results, while the theoretical GSDs of images taken with each camera are about 6~9cm, the visual resolutions are 1.2~1.3 times as great as the theoretical ones.

최근 디지털 항공영상은 우수한 촬영기하와 높은 공간 및 방사해상도로 인하여 대축척 지도제작에 보편적으로 활용되고 있다. 하지만 제작된 결과물에 대한 높은 정밀도와 신뢰도의 확보를 위해서는 촬영된 영상의 품질검증 작업이 선행되어야 한다. 국외에서는 영구적인 항공카메라 검정용 테스트베드를 구축하여 영상취득 시스템을 검증하는 실험적 연구가 활발히 진행되고 있다. 반면 국내에서는 아직 관련 분야에 관한 연구와 실험이 미흡하여 영상의 품질검증을 위한 실용적인 방안의 제시가 절실한 실정이다. 따라서 본 연구에서는 휴대용 Siemens star 타겟을 이용하여 시각적인 방법으로 손쉽게 영상의 공간해상도를 측정하는 방법을 제시하고자 하였다. 본 연구에 이용된 영상은 면형 방식의 DMC, UltraCamXp와 선형방식의 ADS80 등 세 종류의 카메라로 취득하였다. 촬영된 영상에서 Siemens star 타겟을 추출하여 시각적인 방법으로 영상의 해상도를 이론적인 GSD(Ground Sample Distance)와 비교하였다. 아울러 Siemens star 타겟이 촬영된 영상의 위치와 비행방향 및 비행직각 방향에 따라 공간해상도의 변화를 비교 분석하였다. 본 연구의 결과, 카메라별 촬영된 영상의 이론적 GSD는 약 6~9cm인 반면, 시각적 해상도는 이론적인 GSD에 비하여 약 1.2~1.3배 정도 크게 측정됨을 알 수 있었다.

Keywords

References

  1. Becker, S., Haala, N. and Reulke, R., 2005, Determination and improvement of spatial resolution for digital aerial images, Proc. of ISPRS Hannover Workshop 2005: High-Resolution Earth Imaging for Geospatial Information, ISPRS, unpaginated, p. 6.
  2. Beisl, U. and Woodhouse, N., 2004, Correction of atmospheric and bidirectional effects in multispectral ADS40 images for mapping purposes, Proc. of ISPRS, Commission VII, ISPRS, Vol. XXXV-B7, pp. 1-5.
  3. Honkavaara, E., Jaakkola, J., Markelin, L. and Becker, S., 2006, Evaluation of resolving power and MTF of DMC, Proc. of ISPRS Commission I, ISPRS, Vol. XXXVI Part 1, unpaginated, p. 6.
  4. Honkavaara, E., 2008, Calibrating digital photogrametric airborne imaging systems using a test field, Doctoral thesis, Helsinki University of Technology, Finland.
  5. Lee, J. O., Lee, D. M., Yun, B. Y. and Park, C. Y., 2011, A study on the spatial resolution of digital aerial camera, Proc. of 2011 Conference, The Korean Society for Geospatial Information System, pp. 117-118.
  6. Lee, T. Y., 2012, Spatial Resolution Analysis of Aerial Digital Camera, Doctoral thesis, Dong-A University.
  7. Lee, T. Y., Lee, J. O. and Yun, B. Y., 2012, Verification of spatial resolution in DMC imagery using bar target, Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Remote Sensing, Vol. 30, No. 5, pp. 485-492.
  8. Markelin, L., 2013, Radiometric calibration, validation and correction of multispectral photogrammetric imagery, Doctoral thesis, Alto University School of Engineering, Finland.
  9. Reulke, R., Becker, S., Haala, N. and Templemann, U., 2006, Determination and improvement of spatial resolution of the CCD-line-scanner system ADS40, ISPRS Journal of Photogrammetry and Remote Sensing, Vol. 60, pp. 81-90. https://doi.org/10.1016/j.isprsjprs.2005.10.007
  10. Tang, L., Dorstel, C., Jacobsen, K., Heipke, C. and Hinz, A., 2000, Geometric accuracy potential of the digital modular camera, Proc. of the XIXth ISPRS Commission IV, ISPRS, Vol. XXXIII-B4/3, pp. 1051-1057.
  11. Wolf, P. R. and Dewitt, B. A., 2000, Elements of Photogrammetry with Applications in GIS, 3rd edition, McGraw-Hill, USA, pp. 74-77.
  12. Zeitler, W., Dorstel, C. and Jacobsen, K., 2002, Geometric calibration of the DMC: Method and results, Proc. of ISPRS Commission I, ISPRS, Vol. XXXIV Part 1, unpaginated, p. 6.

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