The Soil-Landscape Estimation and Evaluation Program (SLEEP) helps users generate a soil database that is necessary as an input to environmental models. The spatial distribution of soil attributes such as percentage silt, sand, clay, organic content and depth of soil profile varies from one point to another (both in lateral and vertical dimension). It is impractical to measure the soil attributes at each and every point on the earth surface. Spatial interpolation of the measured soil attribute is used to provide continuous representation of soil but there are some limitations owing to the non-uniform distribution of soils over an area.
The idea behind the SLEEP tool is to divide a watershed or area into different zones or “facets” based on the average slope parameters, and then derive a model for each facet relating the soil attributes to different terrain and environmental attributes. Further details are presented in (Ziadat et al., 2015).
The SLEEP tool is created as a toolbox to facilitate and speed up the complex process involved in the objective explained above, so that many iterations can be carried out by simple mouse click.
To run the SLEEP tool, ArcGIS 10.1 Service Pack 1 (ArcView license) or later versions of ArcGIS is needed. The Spatial Analyst extension and Arc Hydro Tools are required to run the models (use default installation directories and note that there may be differences between versions that cause issues with the SLEEP toolset, so it is recommended to use the ArcHydro version compatible with the ArcGIS version installed in the machine, a copy of ArcHydro is provided for the ArcGIS 10.1 Service Pack 1 with the installation package).