ALIGNMENT OF HYPERSPECTRAL IMAGERY AND FULL-WAVEFORM LIDAR DATA FOR VISUALISATION AND CLASSIFICATION PURPOSES
The overarching aim of this paper is to enhance the visualisations and classifications of airborne remote sensing data for remote forest surveys. A new open source tool is presented for aligning hyperspectral and full-waveform LiDAR data. The tool produces coloured polygon representations of the sca...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-04-01
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| Series: | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| Online Access: | http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XL-7-W3/1257/2015/isprsarchives-XL-7-W3-1257-2015.pdf |
| Summary: | The overarching aim of this paper is to enhance the visualisations and classifications of airborne remote sensing data for remote
forest surveys. A new open source tool is presented for aligning hyperspectral and full-waveform LiDAR data. The tool produces
coloured polygon representations of the scanned areas and aligned metrics from both datasets. Using data provided by NERC ARSF,
tree coverage maps are generated and projected into the polygons. The 3D polygon meshes show well-separated structures and are
suitable for direct rendering with commodity 3D-accelerated hardware allowing smooth visualisation. The intensity profile of each
wave sample is accumulated into a 3D discrete density volume building a 3D representation of the scanned area. The 3D volume is
then polygonised using the Marching Cubes algorithm. Further, three user-defined bands from the hyperspectral images are projected
into the polygon mesh as RGB colours. Regarding the classifications of full-waveform LiDAR data, previous work used extraction of
point clouds while this paper introduces a new approach of deriving information from the 3D volume representation and the
hyperspectral data. We generate aligned metrics of multiple resolutions, including the standard deviation of the hyperspectral bands
and width of the reflected waveform derived from the volume. Tree coverage maps are then generated using a Bayesian probabilistic
model and due to the combination of the data, higher accuracy classification results are expected. |
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| ISSN: | 1682-1750 2194-9034 |