Subcatchment Population Dialog

The Subcatchment Population Dialog is displayed as part of the process of setting subcatchment population counts from address point data or census data. The dialog is displayed when Subcatchment | Population data from census areas or Subcatchment | Population data from address point counts is selected from the Model menu.

The options on the dialog vary depending on the menu option selected.

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Option

Description
GIS Surface Import

Choose the source from which the population data is to be imported:

  • From Files - import from GIS file. Enter the path of the file or browse for a file
  • From Layers - import from layer currently loaded on the GeoPlan. Select layer from dropdown list

Select the GIS field containing population data from the Field dropdown.
Update selected subcatchments only Check this option to update the population field of currently selected subcatchments only
Flag Identifier

Flag to be applied to changed data.

Select an existing flag from the dropdown list or click the New Flag button to display the User Defined Flags Dialog.
Value for each Point

Applicable to import from address point data only.

  • From GIS Field - the subcatchment population value will be calculated from the GIS field selected in the Field dropdown in the GIS Surface Import section of the dialog.
  • Fixed - enter a fixed number of perople per address. This field is used as a multiplier. If using a building seeds for example, a figure of about 2.8 people per household could be used as an average.
If input data contains invalid geometry

Applicable to import from census data only.

  • Ignore and continue - continue update process if census polygons contain invalid geometry
  • Stop and report - stop update process and display log if census polygons contain invalid geometry
Log

Applicable to import from census data only.

  • Display - check this option to display a log file for the import process after population values have been updated
  • Summary Table - check this option to display a summary table in the log file

Setting Population Values from GIS Data