The Bootstrap Roughness Modeler Toolis located under the Analysis menu and further the Roughness Analysis menu:
A video tutorial for how to use the Bootstrap Roughness Modeler can be seen below:
GCD - Bootstrap Roughness Modeler
When the Bootstrap Roughness Modeler is run, the following dialog appears:
INPUTS:
The inputs for this tool are:
Input Survey Points
point feature class of the points used to create the Digital elevation model (DEM) used as input below.
Survey Extent
Polygon feature class representing the extent of the survey.
Channel Extent (optional)
Polygon feature class representing areas not to be included in the bootstrapping. For example if a channel unit polygon feature class is used as input then the bootstrap will only be performed using points that exist outside of the channel unit feature class.
DEM
Digital elevation model (DEM) that was created from the input survey points.
Convert to millimeters (optional)
if this check box is selected then the output results will be in millimeters
Vertical units of DEM (optional, only enabled if Convert to millimeters is checked)
grain size metrics are generally reported in millimeters so a conversion based on this value is performed to get values in millimeters.
Number of Iterations
controls the number of times that points should be randomly sampled and differenced from the DEM.
Percent of data to keep as subset each iteration
controls the percent of data that should be kept during each iteration to make a DEM to compare with the DEM provided above.
OUTPUTS:
The outputs for the tool are:
Output Raster Path
path to save the output bootstrap roughness raster to. The output raster is comprised of the mean delta Z between each iteration of sub-setting points and the original DEM.
