# 05: Direct neighbours - slope and aspect

Copyrights (c) 2003 by Olaf Conrad
Simple neighbourhood analysis for grid cells.
- Zevenbergen, L.W. / Thorne, C.R. (1987):
'Quantitative analysis of land surface topography',
Earth Surface Processes and Landforms, 12: 47-56.
(c) 2003 by Olaf Conrad, Goettingen
email: oconrad@gwdg.de

## Parameters

Grid system
Grid system
  Grid system
Input grid
Input Grid
  This must be your input data of type grid.
Slope
Output Grid
  This will contain your output data of type grid.
Aspect
Output Grid
  This will contain your output data of type grid.
Method
Choice
  Choose a method
  Available choices: Steepest gradient (first version), Steepest gradient (second version), Zevenbergen & Thorne