| .calculate_met_focal {geodiv} | R Documentation |
Calculate Texture Metric for Single Pixel
Description
Calculates the various texture metrics over a window centered
on an individual pixel. This function is modified slightly from the
calculate_lsm_focal function in the landscapemetrics package (Hesselbarth et al. 2019).
Usage
.calculate_met_focal(landscape, n_row, n_col, points, what, ...)
Arguments
landscape |
A raster or matrix. |
n_row |
Numeric. Number of rows in focal window. |
n_col |
Numeric. Number of columns in focal window. |
points |
Dataframe. Coordinates and values of cells, calculated with the *landscapemetrics*
|
what |
Character. Metric to calculate for each window. Metrics from the geodiv package are listed below. |
... |
Additional arguments for the metric functions. All applicable arguments will be applied to the entire list of metrics. |
Details
Metrics from geodiv package:
'sa': average surface roughness'sq': root mean square roughness's10z': ten-point height'sdq': root mean square slope of surface, 2-point method'sdq6': root mean square slope of surface, 7-point method'sdr': surface area ratio'sbi': surface bearing index'sci': core fluid retention index'ssk': skewness'sku': kurtosis'sds': summit density'sfd': 3d fractal dimension'srw': dominant radial wavelength, radial wavelength index, mean half wavelength'std': angle of dominating texture, texture direction index'svi': valley fluid retention index'stxr': texture aspect ratio'ssc': mean summit curvature'sv': maximum valley depth'sph': maximum peak height'sk': core roughness depth'smean': mean peak height'svk': reduced valley depth'spk': reduced peak height'scl': correlation length'sdc': bearing area curve height interval
Value
The metric value over the window.
References
Hesselbarth, M.H.K., Sciaini, M., With, K.A., Wiegand, K., Nowosad, J. 2019. landscapemetrics: an open-source R tool to calculate landscape metrics. - Ecography 42:1648-1657(ver. 0).