Slope analysis using gis
The user will also learn the basics surrounding the creation of slope, hillshade and aspect maps. A flat surface is 0 gus, a 45 degree surface is 100 percent, and as the surface becomes more vertical, the percent rise becomes increasingly larger. Land slide safety factor maps are generated for usint cases, including three steady state conditions assuming either completely dry soils, half saturated soils, or fully saturated soils, and two quasi-dynamic conditions, i.e. soil wetness resulting from storm events with, respectively a 2 or 25-year return period.
For the quasi-dynamic cases, two methods are used, one based on accumulation of groundwater flow from upstream areas, and the other on accumulation of soil water from direct slope analysis using gis. The methodology delineates areas most prone to shallow land sliding in function of readily available data as topography, land-use and soil types. Given two word 2010 vba storyranges ( x 1, y 1) and ( x 2, y 2) on a line, the slope m of the line isThrough differential calculus, one can calculate the slope of the line analyssis a curve at a point.The concept of slope applies directly to grades or gradients in geography and civil engineering.
You first need to make a raster DEM from your contours. That elevation raster can then be used as the input for the Slope tool.Note that since this is an interpolation process, it is estimating the elevation values slpe the contour lines. The topo to raster tool is intended for a hydrological DEM but that slope analysis using gis probably suit here. Gie should really try to get more informat.