A feasibility study on the measurement of tree trunks in forests using multi-scale vertical images
The determination of the Diameter at Breast Height (DBH) is an important variable that contributes to several studies on forest, e.g., environmental monitoring, tree growth, volume of wood, and biomass estimation. This paper presents a preliminary technique for the measurement of tree trunks using...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2014-06-01
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| Series: | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| Online Access: | https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XL-5/87/2014/isprsarchives-XL-5-87-2014.pdf |
| Summary: | The determination of the Diameter at Breast Height (DBH) is an important variable that contributes to several studies on forest, e.g.,
environmental monitoring, tree growth, volume of wood, and biomass estimation. This paper presents a preliminary technique for the
measurement of tree trunks using terrestrial images collected with a panoramic camera in nadir view. A multi-scale model is
generated with these images. Homologue points on the trunk surface are measured over the images and their ground coordinates are
determined by intersection of rays. The resulting XY coordinates of each trunk, defining an arc shape, can be used as observations in
a circle fitting by least squares. Then, the DBH of each trunk is calculated using an estimated radius. Experiments were performed in
two urban forest areas to assess the approach. In comparison with direct measurements on the trunks taken with a measuring tape, the
discrepancies presented a Root Mean Square Error (RMSE) of 1.8 cm with a standard deviation of 0.7 cm. These results demonstrate
compatibility with manual measurements and confirm the feasibility of the proposed technique. |
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| ISSN: | 1682-1750 2194-9034 |