FOREST INVENTORY ATTRIBUTE ESTIMATION USING AIRBORNE LASER SCANNING, AERIAL STEREO IMAGERY, RADARGRAMMETRY AND INTERFEROMETRY–FINNISH EXPERIENCES OF THE 3D TECHNIQUES
Three-dimensional (3D) remote sensing has enabled detailed mapping of terrain and vegetation heights. Consequently, forest inventory attributes are estimated more and more using point clouds and normalized surface models. In practical applications, mainly airborne laser scanning (ALS) has been used...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-03-01
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| Series: | ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| Online Access: | http://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/II-3-W4/63/2015/isprsannals-II-3-W4-63-2015.pdf |
| Summary: | Three-dimensional (3D) remote sensing has enabled detailed mapping of terrain and vegetation heights. Consequently, forest
inventory attributes are estimated more and more using point clouds and normalized surface models. In practical applications,
mainly airborne laser scanning (ALS) has been used in forest resource mapping. The current status is that ALS-based forest
inventories are widespread, and the popularity of ALS has also raised interest toward alternative 3D techniques, including airborne
and spaceborne techniques. Point clouds can be generated using photogrammetry, radargrammetry and interferometry. Airborne
stereo imagery can be used in deriving photogrammetric point clouds, as very-high-resolution synthetic aperture radar (SAR) data
are used in radargrammetry and interferometry. ALS is capable of mapping both the terrain and tree heights in mixed forest
conditions, which is an advantage over aerial images or SAR data. However, in many jurisdictions, a detailed ALS-based digital
terrain model is already available, and that enables linking photogrammetric or SAR-derived heights to heights above the ground.
In other words, in forest conditions, the height of single trees, height of the canopy and/or density of the canopy can be measured
and used in estimation of forest inventory attributes. In this paper, first we review experiences of the use of digital stereo imagery
and spaceborne SAR in estimation of forest inventory attributes in Finland, and we compare techniques to ALS. In addition, we
aim to present new implications based on our experiences. |
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| ISSN: | 2194-9042 2194-9050 |