A Review of the Application of Hemispherical Photography in Urban Outdoor Thermal Comfort Studies
BuildingsThermal comfort studies are paramount in enhancing future urban living conditions, and hemispherical photography has emerged as a widely employed field measurement technique in outdoor thermal comfort research.
Lei Sima +4 more
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Comparison of automatic and interactive thresholding of hemispherical photography [PDF]
Journal of Forest Science, 2011 This study presents the effects of operator bias and variation in interactive thresholding on the estimation of light environment using hemispherical photography.
A. Inoue, K. Yamamoto, N. Mizoue
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Hemispherical photography to estimate biophysical variables of cotton [PDF]
Revista Brasileira de Engenharia Agrícola e Ambiental, 2016 The Leaf Area Index (LAI) is a key parameter to evaluate the vegetation spectral response, estimating plant nutrition and water requirements. However, in large fields is difficult to obtain accurate data to LAI determination.
Ziany N. Brandão, João H. Zonta
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Rapid assessment of forest canopy and light regime using smartphone hemispherical photography. [PDF]
Ecol Evol, 2017 AbstractHemispherical photography (HP), implemented with cameras equipped with “fisheye” lenses, is a widely used method for describing forest canopies and light regimes. A promising technological advance is the availability of low‐cost fisheye lenses for smartphone cameras. However, smartphone camera sensors cannot record a full hemisphere.
Bianchi S +3 more
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IForest, 2012 Hemispherical photography has been used since the 1960s in forest ecology. Nevertheless, specific constraints related to film cameras have progressively prevented widespread adoption of this photographic method.
Francesco Chianucci, Andrea Cutini
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PhenoStras2022: A 2022 smartphone-based image and field phenology dataset for monitoring urban trees in Strasbourg, France. [PDF]
Data BriefUrban trees provide critical ecosystem services but remain vulnerable to climate change and urban environmental stresses. To improve understanding of their phenological dynamics and support reproducible urban vegetation monitoring, PhenoStras2022 is ...
Bressant C, Herrault PA, Puissant A.
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Characterizing olive grove canopies by means of ground-based hemispherical photography and spaceborne RADAR data. [PDF]
Sensors (Basel), 2011 One of the main strengths of active microwave remote sensing, in relation to frequency, is its capacity to penetrate vegetation canopies and reach the ground surface, so that information can be drawn about the vegetation and hydrological properties of ...
Molina I +4 more
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Sky-canopy border length, exposure and thresholding influence accuracy of hemispherical photography for complex plant canopies. [PDF]
Bot Stud, 2018 Background Hemispherical photography (HP) is a popular method to estimate canopy structure and understorey light environment, which analyses photographs acquired with wide view-angle lens (i.e. fisheye lens).
Song GM, Chao KJ, Doley D, Yates D.
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Enhanced Gap Fraction Extraction From Hemispherical Photography
IEEE Geoscience and Remote Sensing Letters, 2015 Canopy structure can be estimated using gap fraction (GF) data, which can be directly measured with hemispherical photography. However, GF data accuracy is affected by sunlit canopy, multiple scattering, vignetting, blooming, and chromatic aberration. Here, we present an algorithm to classify hemispherical photography, whose aim is to reduce errors in ...
Gaston M Diaz
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Quantifying the Accuracy of Digital Hemispherical Photography for Leaf Area Index Estimates on Broad-Leaved Tree Species. [PDF]
Sensors (Basel), 2018 Digital hemispherical photography (DHP) has been widely used to estimate leaf area index (LAI) in forestry. Despite the advancement in the processing of hemispherical images with dedicated tools, several steps are still manual and thus easily affected by
Gilardelli C +3 more
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