Quoted from: http://hydro.ou.edu/research/slide/ 

The SLope-Infiltration-Distributed Equilibrium (SLIDE) is a geotechnical model to compute dynamic factor of safety (FS) due to rainfall infiltration using a method developed by Liao et al. 2010. The released SLIDE model is programmed using MATLAB. The SLIDE model takes into account some simplified hypotheses on water infiltration and defines a direct relation between factor of safety and the rainfall depth on an infinite slope. The SLIDE program operates on a grid with four inputs, including the soil texture map, the slope map, the cumulative rainfall map, and the land cover map.

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References

1. Liao, Z., Y. Hong, J. Wang, H. Fukuoka, K. Sassa, D. Karnawati and F. Fathani, 2010: Prototyping an experimental early warning system for rainfall-induced landslides in Indonesia using satellite remote sensing and geospatial datasets. Landslides, 7 (3), 317-324. doi: 10.1007/s10346-010-0219-7. PDF.
2. Yang Hong, Xiaogang He, Amy Cerato, Ke Zhang, Zhen Hong, Zonghu Liao (2014), Predictability of a Physically-based Model for Rainfall-induced Shallow Landslides: Model Development and Case Studies Springer Verlag book “Technologies for Landslide Investigations”.