Data from: Standardizing the protocol for hemispherical photographs: accuracy assessment of binarization algorithms

Glatthorn J, Beckschäfer P

Date Published: December 2, 2014

DOI: http://dx.doi.org/10.5061/dryad.s9652

 

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Title reference_pixels_raw
Downloaded 18 times
Description The file contains the raw data of the reference pixel classification by an operator. Column description: id: unique id refering to a single reference pixel / pic: the picture where the pixel derived from originally / x, y: x- and y- coordinates of the pixles within the pixture / gvcl: One of 16 gray value classes used for the stratified sampling approach to select the reference pixels / r, g, b: the red, green and blue gray value of the pixel (8-bit) / class: classification of the pixel by a human operator
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Title thresholds
Downloaded 15 times
Description The file contains thresholds of the hemispherical photographs which have been used in the publications. For details about the thresholding algorithms see the methodology section of the paper.
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Title hemispherical_photographs
Downloaded 3184 times
Description The processed hemispherical photographs. The original photographs were cropped and LZW-compressed to save memory but are not modified in any other way. The filenames indicate the site number and the used exposure protocol. 'auto_exp' stands for the automatic exposure settings of the camera. 'hist_exp' stands for the histogram exposure protocol introduced by Beckschäfer et al. (2013) (DOI:10.3832/ifor0957-006). The camera was a Nikon D70s DSLR camera equipped with a Sigma Circular Fisheye 4.5 mm 1:2.8 lens with a field of view of 180°.
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Title accuracy_estimates
Downloaded 14 times
Description The file contains accuracy estimates of binarization algorithms of hemispherical photographs. Column description: pic: the name of the picture. From row 142 statistics over all pictures are given. / 'sub' refers to a subset of pictures without sites VIII and IX. 'all' refers to all pictures without exclusion. / bin: name of the algorithms. See the methodology section of the publication for details / pc: percentage correct estimate / var_pc: variance of pc / lower_pc: lower bound of the confidence interval of pc / upper_pc: upper bound of the confidence interval of pc / kap: kappa estimate / var_kap: variance of kappa / lower_kap: lower bound of the confidence interval of kappa / upper_kap: upper bound of the confidence interval of kappa
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When using this data, please cite the original publication:

Glatthorn J, Beckschäfer P (2014) Standardizing the protocol for hemispherical photographs: accuracy assessment of binarization algorithms. PLoS ONE 9(11): e111924. http://dx.doi.org/10.1371/journal.pone.0111924

Additionally, please cite the Dryad data package:

Glatthorn J, Beckschäfer P (2014) Data from: Standardizing the protocol for hemispherical photographs: accuracy assessment of binarization algorithms. Dryad Digital Repository. http://dx.doi.org/10.5061/dryad.s9652
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