Raster calculation code#

After defining the layers (think of them as variables in an equation), you can then write simple code to perform and operation. By default, the Terrain layers will always be available to the user.

OverviewДЄ Calculated Layer is created by defined the Layers you want to use in the analysis. However, a calculated layer can also have a static component layer, such as the Terrain layer or using the value from a particular timestep in a result.ДЄ Calculated Layer is added to RAS Mapper by selecting a RAS Result group or by selecting the Map Layers group, right clicking and choosing the Create a New Calculated Layer menu item. If you are using the calculated layer to compare results from two different HEC-RAS simulations then it is quite convenient to use the animate toolbar to evaluate various timesteps. The Calculated Layer is intended to be treated very similarly to a Dynamic Map, in that you can animate the layer. When using the RASter Calculator, the you are actually creating a syntax for a Calculated Layer that can then be evaluated in RAS Mapper using the interactive querying tools used for evaluating normal RAS Results. The RASter Calculator allows you to perform mathematical and logical operations on gridded datasets in RAS Mapper through user-defined scripts. However, in order to perform analysis of the entire layer, you can use the the RASter Calculator. There are several tools in RAS Mapper that allow the user to evaluate model results at specific locations through interactive point querying and with profile lines.

Raster calculation