Click on the map to select it and click Map | Add | Base Layer, select LovelandPass.tif and click Open. Click Map | New | 3D Surface Map, select LovelandPass_d and click Open.Let’s say we have an area that is prone to avalanches and we want to indicate on a map the areas where the slope is greater than 30°. Using a digital elevation model (or any grid file), create slope maps either by calculating terrain slope in degrees or the gradient of the slope in percent. 15%) instead of a decimal, use Grid | Math to multiply the Gradient Operator results by 100. To calculate slopes as a percentage (e.g. This option generates a grid file of the slope or gradient expressed as a decimal ratio of rise over run, from zero (horizontal) to approaching infinity at vertical. Differential and Integral Operators | Gradient Operator.This is the most commonly used option to create a grid file of terrain slopes. This option generates a grid file of the slopes expressed in degrees, from 0° (horizontal) to 90° (vertical). For example, using Grid | Calculus you could select: The slope values can be expressed either in degrees or as a decimal (rise/run) which can then be computed as a percentage. Slope information can be easily computed from grid, raster or digital elevation models (DEMs) using options under the Grid | Calculus menu command in Surfer. Slope and gradient maps can be easily generated using Surfer. Another example may be to present slope maps of the seabed so that a structure with set tolerances for inclination could be located.
Some examples of when you may want to create slope maps would be to identify areas with high slope to indicate avalanche or landslide danger. Creating a map of slopes is common practice when looking at slope stability.