Correction of laser scanning intensity data: Data and model-driven approaches |
| |
| Authors: | Bernhard Hfle Norbert Pfeifer |
| |
| Institution: | aalpS-Centre for Natural Hazard Management, Grabenweg 3, 6020 Innsbruck, Austria;bInstitute of Geography, University of Innsbruck, Innrain 52, 6020 Innsbruck, Austria;cInstitute of Photogrammetry and Remote Sensing, Vienna University of Technology, Gusshausstrasse 27-29, 1040 Vienna, Austria |
| |
| Abstract: | Most airborne and terrestrial laser scanning systems additionally record the received signal intensity for each measurement. Multiple studies show the potential of this intensity value for a great variety of applications (e.g. strip adjustment, forestry, glaciology), but also state problems if using the original recorded values. Three main factors, a) spherical loss, b) topographic and c) atmospheric effects, influence the backscatter of the emitted laser power, which leads to a noticeably heterogeneous representation of the received power. This paper describes two different methods for correcting the laser scanning intensity data for these known influences resulting in a value proportional to the reflectance of the scanned surface. The first approach – data-driven correction – uses predefined homogeneous areas to empirically estimate the best parameters (least-squares adjustment) for a given global correction function accounting for all range-dependent influences. The second approach – model-driven correction – corrects each intensity independently based on the physical principle of radar systems. The evaluation of both methods, based on homogeneous reflecting areas acquired at different heights in different missions, indicates a clear reduction of intensity variation, to 1/3.5 of the original variation, and offsets between flight strips to 1/10. The presented correction methods establish a great potential for laser scanning intensity to be used for surface classification and multi-temporal analyses. |
| |
| Keywords: | Laser scanning Signal intensity Reflectance Correction |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
