Calibrating PhenoCam Data with Phenological Observations of a Black Spruce Stand
Bud and leaf development are important phenological events and help in defining the growing period of trees. Canopy greenness derived from PhenoCam has been used to investigate leaf phenology. Questions remain on how much the continuous records of canopy greenness represent bud developmental phases,...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2020-03-01
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| Series: | Canadian Journal of Remote Sensing |
| Online Access: | http://dx.doi.org/10.1080/07038992.2020.1761251 |
| _version_ | 1797661122084470784 |
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| author | Shaokang Zhang Valentina Buttò Siddhartha Khare Annie Deslauriers Hubert Morin Jian-Guo Huang Hai Ren Sergio Rossi |
| author_facet | Shaokang Zhang Valentina Buttò Siddhartha Khare Annie Deslauriers Hubert Morin Jian-Guo Huang Hai Ren Sergio Rossi |
| author_sort | Shaokang Zhang |
| collection | DOAJ |
| description | Bud and leaf development are important phenological events and help in defining the growing period of trees. Canopy greenness derived from PhenoCam has been used to investigate leaf phenology. Questions remain on how much the continuous records of canopy greenness represent bud developmental phases, and how growing period boundaries are related to canopy greenness and bud phenology. In this study, we compared bud phenology of black spruce [Picea mariana (Mill.) B.S.P] during 2015, 2017 and 2018 with the canopy greenness, represented by Green Chromatic Coordinate (GCC), derived from PhenoCam images of a boreal stand in Quebec, Canada. Logit models were applied to estimate the probability of observing sequential phenological phases of bud burst and bud set along with GCC. GCC showed a bell-shaped pattern, with a slow increase in spring, a peak in summer and a gradual decrease in autumn. The start and end of budburst, and bud set, occurred when GCC reached 72% and 92% (spring), and 94% (autumn) of its maximum amplitude, respectively. These GCC values are reliable thresholds indicating the growing period boundaries. Our study builds a bridge between phenological observations and automatic near-surface remote sensing, providing a statistically sound protocol for calibrating PhenoCam with field observations. |
| first_indexed | 2024-03-11T18:40:34Z |
| format | Article |
| id | doaj.art-82ddb89981d7417b9f0c8fea8b7c82e4 |
| institution | Directory Open Access Journal |
| issn | 1712-7971 |
| language | English |
| last_indexed | 2024-03-11T18:40:34Z |
| publishDate | 2020-03-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Canadian Journal of Remote Sensing |
| spelling | doaj.art-82ddb89981d7417b9f0c8fea8b7c82e42023-10-12T13:36:23ZengTaylor & Francis GroupCanadian Journal of Remote Sensing1712-79712020-03-0146215416510.1080/07038992.2020.17612511761251Calibrating PhenoCam Data with Phenological Observations of a Black Spruce StandShaokang Zhang0Valentina Buttò1Siddhartha Khare2Annie Deslauriers3Hubert Morin4Jian-Guo Huang5Hai Ren6Sergio Rossi7Chinese Academy of SciencesUniversité du Québec à Chicoutimi, 555, boulevard de l’UniversitéUniversité du Québec à Chicoutimi, 555, boulevard de l’UniversitéUniversité du Québec à Chicoutimi, 555, boulevard de l’UniversitéUniversité du Québec à Chicoutimi, 555, boulevard de l’UniversitéChinese Academy of SciencesChinese Academy of SciencesChinese Academy of SciencesBud and leaf development are important phenological events and help in defining the growing period of trees. Canopy greenness derived from PhenoCam has been used to investigate leaf phenology. Questions remain on how much the continuous records of canopy greenness represent bud developmental phases, and how growing period boundaries are related to canopy greenness and bud phenology. In this study, we compared bud phenology of black spruce [Picea mariana (Mill.) B.S.P] during 2015, 2017 and 2018 with the canopy greenness, represented by Green Chromatic Coordinate (GCC), derived from PhenoCam images of a boreal stand in Quebec, Canada. Logit models were applied to estimate the probability of observing sequential phenological phases of bud burst and bud set along with GCC. GCC showed a bell-shaped pattern, with a slow increase in spring, a peak in summer and a gradual decrease in autumn. The start and end of budburst, and bud set, occurred when GCC reached 72% and 92% (spring), and 94% (autumn) of its maximum amplitude, respectively. These GCC values are reliable thresholds indicating the growing period boundaries. Our study builds a bridge between phenological observations and automatic near-surface remote sensing, providing a statistically sound protocol for calibrating PhenoCam with field observations.http://dx.doi.org/10.1080/07038992.2020.1761251 |
| spellingShingle | Shaokang Zhang Valentina Buttò Siddhartha Khare Annie Deslauriers Hubert Morin Jian-Guo Huang Hai Ren Sergio Rossi Calibrating PhenoCam Data with Phenological Observations of a Black Spruce Stand Canadian Journal of Remote Sensing |
| title | Calibrating PhenoCam Data with Phenological Observations of a Black Spruce Stand |
| title_full | Calibrating PhenoCam Data with Phenological Observations of a Black Spruce Stand |
| title_fullStr | Calibrating PhenoCam Data with Phenological Observations of a Black Spruce Stand |
| title_full_unstemmed | Calibrating PhenoCam Data with Phenological Observations of a Black Spruce Stand |
| title_short | Calibrating PhenoCam Data with Phenological Observations of a Black Spruce Stand |
| title_sort | calibrating phenocam data with phenological observations of a black spruce stand |
| url | http://dx.doi.org/10.1080/07038992.2020.1761251 |
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