SPECTRAL DIFFERENCES OF TREE SPECIES BELONGING TO ATLANTIC FOREST OBTAINED FROM UAV HYPERSPECTRAL IMAGES
The objective of this study is to evaluate the spectral difference between and within 11 tree species belonging to Brazilian Atlantic Forest located in the countryside of São Paulo State, Brazil. Tree species with different development stages may have different reflectance spectra because of the str...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2020-11-01
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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/XLII-3-W12-2020/49/2020/isprs-archives-XLII-3-W12-2020-49-2020.pdf |
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| author | G. T. Miyoshi N. N. Imai N. N. Imai A. M. G. Tommaselli A. M. G. Tommaselli E. Honkavaara |
| author_facet | G. T. Miyoshi N. N. Imai N. N. Imai A. M. G. Tommaselli A. M. G. Tommaselli E. Honkavaara |
| author_sort | G. T. Miyoshi |
| collection | DOAJ |
| description | The objective of this study is to evaluate the spectral difference between and within 11 tree species belonging to Brazilian Atlantic Forest located in the countryside of São Paulo State, Brazil. Tree species with different development stages may have different reflectance spectra because of the structural and phenological influence on it. Tree structure can affect the crown spectra due to the differences in geometry of view and density of shadow and sunlight pixels. Additionally, reflectance spectra can be similar between tree species belonging from different species, which affect the classification accuracy of these targets. In this sense, we evaluate the spectral difference between highly diverse Atlantic Forest using two different features extracted from individual tree crowns (ITCs). Mean reflectance spectra and mean normalized reflectance spectra of each ITC were used. They were computed from hyperspectral images acquired with sensor onboard unmanned aerial vehicle. Differences between tree species and within-species were calculated. Wilcoxon-Mann-Whitney test was applied in order to statistically evaluate whether the reflectance spectra were different. Results showed that the normalized values are more propense to increase the classification accuracies than using the mean values since it reduces the variability within-species and present a higher number of different values between-species. |
| first_indexed | 2024-12-23T23:49:48Z |
| format | Article |
| id | doaj.art-a9e982cca8ef44869858d3ce71eed8b9 |
| institution | Directory Open Access Journal |
| issn | 1682-1750 2194-9034 |
| language | English |
| last_indexed | 2024-12-23T23:49:48Z |
| publishDate | 2020-11-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| spelling | doaj.art-a9e982cca8ef44869858d3ce71eed8b92022-12-21T17:25:25ZengCopernicus PublicationsThe International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences1682-17502194-90342020-11-01XLII-3-W12-2020495410.5194/isprs-archives-XLII-3-W12-2020-49-2020SPECTRAL DIFFERENCES OF TREE SPECIES BELONGING TO ATLANTIC FOREST OBTAINED FROM UAV HYPERSPECTRAL IMAGESG. T. Miyoshi0N. N. Imai1N. N. Imai2A. M. G. Tommaselli3A. M. G. Tommaselli4E. Honkavaara5Graduate Program in Cartographic Sciences, São Paulo State University (UNESP), Presidente Prudente, SP 19060-900, BrazilGraduate Program in Cartographic Sciences, São Paulo State University (UNESP), Presidente Prudente, SP 19060-900, BrazilDept. of Cartography, São Paulo State University (UNESP), Presidente Prudente, SP 19060-900, BrazilGraduate Program in Cartographic Sciences, São Paulo State University (UNESP), Presidente Prudente, SP 19060-900, BrazilDept. of Cartography, São Paulo State University (UNESP), Presidente Prudente, SP 19060-900, BrazilFinnish Geospatial Research Institute, National Land Survey of Finland, Geodeetinrinne 2, 02430 Masala, FinlandThe objective of this study is to evaluate the spectral difference between and within 11 tree species belonging to Brazilian Atlantic Forest located in the countryside of São Paulo State, Brazil. Tree species with different development stages may have different reflectance spectra because of the structural and phenological influence on it. Tree structure can affect the crown spectra due to the differences in geometry of view and density of shadow and sunlight pixels. Additionally, reflectance spectra can be similar between tree species belonging from different species, which affect the classification accuracy of these targets. In this sense, we evaluate the spectral difference between highly diverse Atlantic Forest using two different features extracted from individual tree crowns (ITCs). Mean reflectance spectra and mean normalized reflectance spectra of each ITC were used. They were computed from hyperspectral images acquired with sensor onboard unmanned aerial vehicle. Differences between tree species and within-species were calculated. Wilcoxon-Mann-Whitney test was applied in order to statistically evaluate whether the reflectance spectra were different. Results showed that the normalized values are more propense to increase the classification accuracies than using the mean values since it reduces the variability within-species and present a higher number of different values between-species.https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLII-3-W12-2020/49/2020/isprs-archives-XLII-3-W12-2020-49-2020.pdf |
| spellingShingle | G. T. Miyoshi N. N. Imai N. N. Imai A. M. G. Tommaselli A. M. G. Tommaselli E. Honkavaara SPECTRAL DIFFERENCES OF TREE SPECIES BELONGING TO ATLANTIC FOREST OBTAINED FROM UAV HYPERSPECTRAL IMAGES The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| title | SPECTRAL DIFFERENCES OF TREE SPECIES BELONGING TO ATLANTIC FOREST OBTAINED FROM UAV HYPERSPECTRAL IMAGES |
| title_full | SPECTRAL DIFFERENCES OF TREE SPECIES BELONGING TO ATLANTIC FOREST OBTAINED FROM UAV HYPERSPECTRAL IMAGES |
| title_fullStr | SPECTRAL DIFFERENCES OF TREE SPECIES BELONGING TO ATLANTIC FOREST OBTAINED FROM UAV HYPERSPECTRAL IMAGES |
| title_full_unstemmed | SPECTRAL DIFFERENCES OF TREE SPECIES BELONGING TO ATLANTIC FOREST OBTAINED FROM UAV HYPERSPECTRAL IMAGES |
| title_short | SPECTRAL DIFFERENCES OF TREE SPECIES BELONGING TO ATLANTIC FOREST OBTAINED FROM UAV HYPERSPECTRAL IMAGES |
| title_sort | spectral differences of tree species belonging to atlantic forest obtained from uav hyperspectral images |
| url | https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLII-3-W12-2020/49/2020/isprs-archives-XLII-3-W12-2020-49-2020.pdf |
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