Liu, Xiaoye and Zhang, Zhenyu (2008) Ground truth extraction from LiDAR data for image orthorectification. In: 2008 International Workshop on Earth Observation and Remote Sensing Applications, 30 Jun-2 Jul 2008, Beijing, China.
The availability of high accuracy GCPs (Ground Control Points) and DEMs (Digital Elevation Models) becomes the key issue for successful implementation of an image orthorectification project. It is a very difficult task for collecting a large number of high quality GCPs by using traditional methods to meet all the requirements for digital photogrammetric and orthorectification process. Airborne light detection and ranging (LiDAR) – also referred to as airborne laser scanning (ALS), provides an alternative for high-density and high-accuracy three- imensional terrain point data acquisition. One of the appealing features in the LiDAR output is the direct vailability of three dimensional coordinates of points and intensity data in object space. With LiDAR data, highaccuracy and high-resolution intensity image, hillshade DSM (Digital Surface Model) image, and DEM can be generated. Due to high planimetric accuracy characteristics of LiDAR data, ground truth can be extracted from these LiDAR-derived products (e.g., hillshade image and intensity image). This study investigated the feasibility of using LiDAR-derived hillshade DSM image and intensity image to extract ground truth for aerial image orthorectification. Two sets of GCPs were extracted from hillshade image and intensity image separately, and then were used as the inputs for aerial triangulation processing. LiDARderived DEM was then employed for differential rectification to produce the final orthoimage. The assessment of the planimetric accuracy of orthorectified images by using different set of GCPs was conducted by comparing the coordinates of some checking points from orthoimages and correspondent GPS surveyed coordinates.
|Item Type:||Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)|
|Additional Information:||Published version deposited in accordance with the copyright policy of the publisher. ©2008 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.|
|Uncontrolled Keywords:||LiDAR; image orthorectification; ground control points|
|Subjects:||290000 Engineering and Technology > 291000 Geomatic Engineering > 291003 Photogrammetry and Remote Sensing|
|Depositing User:||Dr Xiaoye Liu|
|Date Deposited:||18 Nov 2009 06:59|
|Last Modified:||02 Jul 2013 23:09|
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