QGIS Export Raster to asc

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Revision as of 09:09, 15 July 2013 by Par (talk | contribs) (→‎Method)
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Introduction

A large number of different file formats are used for storing raster or DEM data. In this page we will use QGIS to convert a format not recognised by TUFLOW into a format used by TUFLOW. In this example a .dem file format is used. However, a large number of formats are supported in the GDAL raster formats, a list is provided here: GDAL Raster Formats.

Method

  1. Open the file you wish to convert by selecting Layer >> Add Raster Layer
  2. Qgis convert raster01.jpg
  3. Open the raster translator by selecting Raster >> Conversions >>Translate
  4. Qgis convert raster02.jpg
  5. Set the input layer and in the Output file press the Select Button
  6. In the save dialogue, drop the file type down and select Arc/Info ASCII Grid (*.asc *.ASC). Set a filename and path including the .asc extension. Press Save to close the dialogue.
  7. Qgis convert raster03.jpg
  8. Press ok to perform the translation.
  9. Qgis convert raster04.jpg
  10. The file is now ready for input in TUFLOW, the .tgc command is Read GRID Zpts == <dem.asc>