dispP: Dispersal matrices for rust fungi of cereal crops.

In landsepi: Landscape Epidemiology and Evolution

Dispersal matrices for rust fungi of cereal crops.

Description

Five vectorised dispersal matrices of pathogens as typified by rust fungi of cereal crops (genus Puccinia), and associated with landscapes 1 to 5 (composed of 155, 154, 152, 153 and 156 fields, respectively).

Usage

 dispP_1
 dispP_2
 dispP_3
 dispP_4
 dispP_5

Format

The format is: num [1:24025] 8.81e-01 9.53e-04 7.08e-10 1.59e-10 3.29e-06 ...

Details

The pathogen dispersal matrix gives the probability for a pathogen in a field i (row) to migrate to field i' (column) through dispersal. It is computed based on a dispersal kernel and the euclidian distance between each point in fields i and i', using the CaliFloPP algorithm (Bouvier et al. 2009). The dispersal kernel is an isotropic power-law function of equation: f(x)=((b-2)*(b-1)/(2*pi*a^2)) * (1 + x/a)^{-b} with a=40 a scale parameter and b=7 related to the weight of the dispersal tail. The expected mean dispersal distance is given by 2*a/(b-3)=20 m.

References

Bouvier A, Kiêu K, Adamczyk K, Monod H. Computation of the integrated flow of particles between polygons. Environ. Model Softw. 2009;24(7):843-9. doi: http://dx.doi.org/10.1016/j.envsoft.2008.11.006.

Examples

dispP_1
summary(dispP_1)
## maybe str(dispP_1) ; plot(dispP_1) ...

landsepi documentation built on July 26, 2023, 5:36 p.m.