SINMAP 2.0 for ArcGIS - A Stability Index Approach to Terrain Stability Hazard Mapping, User's Manual

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SINMAP 2.0 (Stability Index MAPping) is an ArcGIS 9.x ArcMap Add-in which implements the computation and mapping of a slope stability index based upon geographic information, primarily digital elevation data. SINMAP has its theoretical basis in the infinite plane slope stability model with wetness (pore pressures) obtained from a topographically based steady state model of hydrology. Digital elevation model (DEM) methods are used to obtain the necessary input information (slope and specific catchment area). Parameters are allowed to be uncertain following uniform distributions between specified limits. These may be adjusted (and calibrated) for geographic “calibration regions” based upon soil, vegetation or geologic data. The methodology includes an interactive visual calibration that adjusts parameters while referring to observed landslides. The calibration involves adjustment of parameters so that the stability map “captures” a high proportion of observed landslides in regions with low stability index, while minimizing the extent of low stability regions and consequent alienation of terrain to regions where landslides have not been observed. This calibration is done while simultaneously referring to the stability index map, a specific catchment area and slope plot (of landslide and non landslide points) where lines distinguish the zones categorized into the different stability classes and a table giving summary statistics.

SINMAP 2.0 is the second major release of SINMAP. The principle purpose of this release is the conversion for use with ArcGIS in place of ArcView 3.x. SINMAP 2.0 is available for Windows operating systems that support ArcGIS for Windows from Environmental Systems Research Institute, Inc. (ESRI). ArcGIS is used for GIS display functionality. SINMAP 2.0 has been tested with ArcGIS 9.0, 9.1, 9.2, 9.3 and 9.3.1 and requires either ArcView, ArcEditor or ArcInfo licences. SINMAP is partially functional in ArcGIS 10 - see details below. The original version of SINMAP for ArcView 3.x, as well as the MW SINMAP V1.1 version for MapWindow are available. Also, SINMAP source code is available for those who want to implement SINMAP on a different system.