Symbolize by Dot Density (Business Analyst)
Thematically maps a feature class based on a numeric field as dots on the map to convey the intensity of an attribute.
This is a type of thematic map in which a certain number of dots are used to represent a numeric attribute associated with a polygon layer.
When selecting the dot size, keep a perspective on the data you are symbolizing. For example, selecting a dot size of 10 based on 2004 total population per county would result in a map that would be mostly black, since the dot distribution would be too dense to visualize. A better choice would be to select a dot size of 100 or 1,000 to better see the distribution of population.
The dots are evenly distributed across each polygon in your feature class.
The input feature layer.
The attribute field used to define the thematic map.
The numeric value that represents the field selection to be symbolized.
The color assigned to the points to be symbolized.
Identifies the features that will be used to generate the thematic map.
# Name: SymbolizeByDotDensity.py # Description: Symbolizes block groups by dot density using total population. # Author: ESRI # Import system modules import arcpy arcpy.ImportToolbox("C:\Program Files\ArcGIS\Desktop10.0\ArcToolbox\Toolboxes\Business Analyst Tools.tbx") try: # Acquire extension license arcpy.CheckOutExtension("Business") # Defines the parameters for the Symbolize by Dot Density tool Input = "C:/Program Files/ArcGIS/Desktop10.0/Business Analyst/Data/BDS/esri_bg.bds" Fld= "TOTPOP_CY" # Thematically symbolizes a polygon layer by dot density # Red point is –65536 arcpy.SymbolizeByDotDensity_ba(sInput, sFld, 10, –65536) # Release extension license arcpy.CheckInExtension("Business") except: print arcpy.GetMessages(2)