The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Download
Publications Copernicus
Download
Citation
Articles | Volume XLI-B3
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B3, 131–135, 2016
https://doi.org/10.5194/isprs-archives-XLI-B3-131-2016
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B3, 131–135, 2016
https://doi.org/10.5194/isprs-archives-XLI-B3-131-2016

  09 Jun 2016

09 Jun 2016

AUTOMATIC KAPPA ANGLE ESTIMATION FOR AIR PHOTOS BASED ON PHASE ONLY CORRELATION

Z. Xiong, D. Stanley, and Y. Xin Z. Xiong et al.
  • PCI Geomatics Inc. 90 Allstate Parkway, Suite 501, Markham, ON L3R 6H3, Canada

Keywords: Kappa, Phase-Only Matching, Azimuth, Strip, Image Space, Object Space

Abstract. The approximate value of exterior orientation parameters is needed for air photo bundle adjustment. Usually the air borne GPS/IMU can provide the initial value for the camera position and attitude angle. However, in some cases, the camera’s attitude angle is not available due to lack of IMU or other reasons. In this case, the kappa angle needs to be estimated for each photo before bundle adjustment. The kappa angle can be obtained from the Ground Control Points (GCPs) in the photo. Unfortunately it is not the case that enough GCPs are always available. In order to overcome this problem, an algorithm is developed to automatically estimate the kappa angle for air photos based on phase only correlation technique. This function has been embedded in PCI software. Extensive experiments show that this algorithm is fast, reliable, and stable.