Introduction to SAGAGIS

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Introduction to SAGAGIS

• An example for free and open source software.

Rainer Prüller Graz University of Technology
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Introduction

• http//www.saga-gis.org
• SAGA - short hand for "System for Automated
  Geoscientific Analyses
• Free, hybrid, cross-platform GIS software
• Computational methods for raster, vector and
  tabular data

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Introduction

• Easy and effective implementation of spatial
  algorithms
• Steady growing availability of geoscientific
  methods
• Methods are implemented in various SAGA modules
• Runs under Windows and Linux operating systems

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Introduction

• Development started with the beginning of the 3rd
  millenium
• Dept. Of Physical Geography, Göttingen, Germany
• Since 2007 Hamburg, Germany

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License issues

• Free Open Source Software (FOSS)
• Means the freedom
• to run the program, for any purpose,
• to study how the program works and to modify it,
• to redistribute copies,
• to improve the program, and release the
  improvements to the public

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Graphical User Interface (GUI)
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Graphical User Interface (GUI)
Maps
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Graphical User Interface (GUI)
3D view
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Graphical User Interface (GUI)
Digitizing
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Graphical User Interface (GUI)
Histogram
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Graphical User Interface (GUI)
Layout
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Graphical User Interface (GUI)
Tables
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Modules
Different file formats
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Modules
Projections
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Modules
Vector data
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Modules
Raster data
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Modules
Statistics
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Modules
Various models for Terrain Analysis
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Installation - Windows

• Portable software
• Download from http//www.saga-gis.org
• Unzip the file (16.3 Mbyte)
• Run 'saga_gui.exe'
• Similar process under Linux
• Wiki http//saga-gis.wiki.sourceforge.net/

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Examples

• Data import
• DEM calculations
• Applying models

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1. Data import

• Image files
• Shapes
• Digital elevation models TIN, GRID
• GPS data
• DXF
• Tables using ODBC

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2. DEM calculations

• Import of a GRID from Shapefile
• Module Libraries Grid Gridding
• Module Shape to Grid

Source data Height information Dimension
Grid Size
Imported Grid
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2. DEM calculations

• Import of a GRID from raster image
• Modules File Grid GDAL Import Raster via
  GDAL
• Choose file raster image Bischkek_Sued.tif
• Raster image is converted to .sgrid
• Analyses can be done

SRTM 3D view Bishkek, direction south
SRTM Bishkek
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3. Applying models

• DEM calculations
• Modules Terrain Analysis Standard Terrain
  Analysis
• Slope
• Aspect
• Curvature

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3. Applying models
e.g. Aspect
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3. Applying models

• Test of further models
• Terrain Analysis Hydrology
• Simulation - Hydrology
• Terrain Analysis Lightning, Visibility
• Solar radiation in session tomorrow

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DEM 3D view

• Open DEM
• Choose 3D from the menue

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DEM 3D view
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Outlook

• Dissemination of solar and
• hydropotentials Computation
• Evaluation and presentation of concrete solar
  potentials in Kyrgyzstan by means of SAGAGIS
• Tomorrow, 25th of August, 1330