How is the slope of a raster calculated?
The output slope raster can be calculated in two types of units, degrees or percent (percent rise). The percent rise can be better understood if you consider it as the rise divided by the run, multiplied by 100. Consider triangle B below. When the angle is 45 degrees, the rise is equal to the run, and the percent rise is 100 percent.
How to calculate the slope of a surface?
Syntax Parameter Explanation Data Type in_raster The input surface raster. Raster Layer output_measurement (Optional) Determines the measurement units (degree String z_factor (Optional) Number of ground x,y units in one surfac Double
How is the slope calculated in ArcGIS Pro?
The output slope raster can be calculated in two types of units, degrees or percent (percent rise). The percent rise can be better understood if you consider it as the rise divided by the run, multiplied by 100. Consider triangle B below.
What is the range of slope for degrees?
The range of values in the output depends on the type of measurement units. For degrees, the range of slope values is 0 to 90. For percent rise, the range is 0 to essentially infinity. A flat surface is 0 percent, a 45 degree surface is 100 percent, and as the surface becomes more vertical, the percent rise becomes increasingly larger.
How does a flattening of the slope in ArcGIS work?
At the edge of the raster, at least three cells (outside the raster’s extent) will contain NoData as their z-values. These cells will be assigned the center cell’s z-value. The result is a flattening of the 3 x 3 plane fitted to these edge cells, which usually leads to a reduction in the slope.
When to use Z factor to calculate slope?
The use of a z-factor is essential for correct slope calculations when the surface z units are expressed in units different from the ground x,y units. The range of values in the output depends on the type of measurement units.