# 09: Extended neighbourhoods - catchment areas (recursive)

Copyrights (c) 2003 by Olaf Conrad
Extended Neighbourhoods - Use recursive function calls for catchment area calculations.
(c) 2003 by Olaf Conrad, Goettingen
email: oconrad@gwdg.de

## Parameters

Grid system
Grid system
  Grid system
Elevation grid
Input Grid
  This must be your input data of type grid.
Catchment area
Output Grid
  This will contain your output data of type grid.