DOI QR코드

DOI QR Code

Accuracy Evaluation of DEM Produced by using KOMPSAT-5 InSAR Image

KOMPSAT 5호 InSAR영상을 이용한 DEM제작 정확도 평가

  • 한승희 (공주대학교 건설환경공학부)
  • Received : 2017.10.07
  • Accepted : 2017.12.08
  • Published : 2017.12.10

Abstract

The SAR payload of the KOMPSAT-5 is equipped with an X-band (9.66GHz) microwave-based sensor. Especially, since it has a fixed antenna that can be electronically steered with respect to the azimuth and elevation planes, various applications are expected. This study evaluates the production performance and the accuracy of the DEM by producing DEM using the HR and UH mode images of KOMPSAT-5. To evaluate the production performance of the DEM, the sensitivity of DEM was assessed through a baseline analysis and $2{\pi}$ ambiguity; it was found to have good production performance. In addition, to evaluate the accuracy of the produced DEM, 30 check points were compared with SRTM data. As a result, STDEV ${\pm}15-20m$ accuracy was obtained. If the accuracy of the DEM is improved by adjusting the parameters of the filtering method or phase unwrapping method in the future, it will be possible to widely use the KOMPSAT-5 image for environmental and disaster monitoring.

KOMPSAT 5호의 SAR 탑재체는 X-밴드(9.66GHz) 마이크로파를 매개로 하는 센서가 탑재되어 있다. 특히, 방위각과 고도평면에 대해 전자 조향이 가능한 고정형 안테나를 가지고 있으므로 다양한 활용이 기대된다. 본 연구에서는 KOMPSAT 5호의 HR, UH모드영상을 이용하여 DEM을 제작함으로써 제작성능과 DEM의 정확도를 평가하였다. DEM제작성능평가를 위해 기선분석과 $2{\pi}$ ambiguity를 통해 DEM의 민감도를 판단한 결과 양호한 제작성능을 가지고 있음을 알 수 있었다. 또한 제작된 DEM의 정확도 평가를 위해 30점의 검사점에 대해 SRTM데이터와 비교하였으며 그 결과 표준편차 ${\pm}15{\sim}20m$의 정확도를 얻었다. 향후 필터링 방법이나 Phase unwrapping방법의 파라메타를 조정함에 의해 DEM의 정확도를 개선한다면 환경 및 재해모니터링 등에 KOMPSAT5호 영상을 폭넓게 활용할 수 있을 것으로 판단된다.

Keywords

References

  1. 이상률, 김진희, 윤재철. 2012. 다목적실용위성5호 개발 현황, 한국항공우주학회 2012년도 추계학술대회논문집. 846-850. Lee S R, K im JH, Yoon JC. 2 012. Development of KOMPSAT-5 System. 2012 Conference of KSAS. 846-850.
  2. 이원진, 정형섭, Zhong Lu. 2010. ERS-Envisat SAR Cross-Interferometry를 이용한 고정밀 DEM 생성에 관한 연구. 한국측량학회지. 28(4) : 431-439. Lee W J, Jung HS, Zhong Lu. 2 010. A Study on High-Precision DEM Generation Using ERSEnvisat SAR Cross-Interferometry. Journal of the Korean Society of Survey, Geodesy, Photogrammetry, and Cartography. 28(4) : 431-439.
  3. 송영선, 김기홍. 2013. Radargrammetry를 이용한 C-밴드 및 X-밴드 SAR위성영상의 DEM 생성 평가. 한국지형공간정보학회지. 21(4) : 109-116. Song Y S, K im G H. 2013. Assessment of DEM Generated by Stereo C-band and X-band SAR images using. Journal of Korean Society for Geospatial Information Science. 21(4) : 109-116. https://doi.org/10.7319/kogsis.2013.21.4.109
  4. 한승희 , 김성길. 2016. KOMPSAT 5의 센서제원과 활용방안. 한국콘텐츠학회 2016년도 종합학술대회논문집. 207-208. Han SH, Kim SG. 2016. Sensor Specification and Application of KOMPSAT5. 2016 Conference of the Korea Contents Association. 207-208.
  5. Arnaud A, Adam N, Hanssen R, Inglada J, Duro J, Closa J, Eineder M. 2003. ASAR ERS Interferometric Phase Continuity. In International Geoscience and Remote Sensing Symposium.
  6. Crosetto M, Biescas E, Duro J, Closa J, Arnaud A. 2008. Generation of Advanced ERS and Envisat Interferometric SAR Products Using the Stable Point Network Technique. Photogrammetric Engineering & Remote Sensing. 74(4) : 443-450. https://doi.org/10.14358/PERS.74.4.443
  7. European Space Agency. 2007. Guidelines for SAR Interferometry Processing and Interpretation, TM-19.
  8. Johnnessen JA, Collard F. 2013. SAR Instrument Principles and Processing. 3rd ESA Advanced Training on Ocean Remote Sensing, Cork, Ireland.
  9. KARI. 2015, KOMPSAT-5 After a through Facelift.
  10. KARI. 2015. KOMPSAT-5 Product SpecificationStandard Products Specification, Ver.1.2.
  11. Kim D J, Moon W M, Hwang J H, K im Y S. 2010. Application of KOMPSAT-5 Data for Emergent Oil Spill Monitoring. Geoscience and Remote Sensing Symposium (IGARSS), 2010 IEEE International, 1254-1257.
  12. Prait C, Rocca F. 1994. Report on ERS-1 Interferometric Techniques and Applications. Dipartimento di Eletronica- Politecnico di Milano, Italy.
  13. SARmap. 2016. SARscape's Basic module Tutorial. Version 1.0. Radar Interferometry with Sarscape Software. Photogrammetry and Remote Sensing, XXIII FIG Congress, Germany.
  14. SII. 2016. KOMPSAT-5 Standard Production.
  15. Yang DC, Jung OC, Lee DH. 2016. KOMPSAT-5/6 SAR INTERFEROMETRY. 11th European Conference on Synthetic Aperture Radar, EUSAR.
  16. Wegmuller U. Wiesmann A, Werner C, Frey O. 2014. KOMPSAT-5 support within GAMMA Software. Gamma Remote Sensing AG.