When the Grain Size Distribution Calculator is run, the following dialog appears:

INPUTS:

• Surface roughness raster
• raster representing surface roughness. With high density data it is recommended to create this raster with the Simple ToPCAT Roughness Tool.
• Vertical units of surface roughness raster
• grain size metrics are generally reported in millimeters so a conversion based on this value is performed to get values in millimeters .
• Channel unit polygon
• Polygon feature class representing areas of interest where the grain size metrics of D₁₆, D₅₀, D₈₄, and D₉₀ will be calculated for.
• Unique channel Field
• Field in polygon feature class that will be used as a unique identifier to append the grain size metrics to the correct field. It is important that the value of this field is a unique for each record in the feature class.
• Append grain size metrics (optional)
• if this check box is selected then the grain size metrics of D16, D50, D84, and D90 will be appended to the channel unit polygon
• Append number of raster cells (optional)
• if this check box is selected then the number of raster cells used to calculate the grain size metrics will be appended to the channel unit polygon.
  

OUTPUTS:

• Create cumulative distribution plot
• if this check box is selected then a cumulative distribution figure of the grain size distribution will be created for each polygon in the channel unit polygon.
• CDF Folder
• The folder to store the cumulative distribution plots to. Each file is named as a combination of the unique field name and its value. For example if a field called Id was used for the unique channel field then the figure for the polygon with an Id of 23 would be named Id_23.png