Difference between revisions of "QGIS Export Raster to asc"
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<li>The file is now ready for input in TUFLOW, the .tgc command is Read GRID Zpts == <dem.asc></li> | <li>The file is now ready for input in TUFLOW, the .tgc command is Read GRID Zpts == <dem.asc></li> | ||
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+ | NOTE, QGIS can default to the Golden Surfer type of ascii grid. This grid format does not have square cell sizes and is not currently supported by TUFLOW. | ||
+ | <br>There is more information on this issue in [http://gis.stackexchange.com/questions/118325/qgis-ascii-grid-output-problem| this stack exchange post.] | ||
+ | To correct this issue, add '-co force_cellsize=true' to the text box underneath the 'load into canvas when finished' button. Add the text after the word 'gdal_translate' |
Revision as of 23:38, 29 February 2016
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
- Open the file you wish to convert by selecting Layer >> Add Raster Layer
- Open the raster translator by selecting Raster >> Conversions >>Translate
- Set the input layer and in the Output file press the Select Button
- 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.
- Press ok to perform the translation.
- The file is now ready for input in TUFLOW, the .tgc command is Read GRID Zpts == <dem.asc> NOTE, QGIS can default to the Golden Surfer type of ascii grid. This grid format does not have square cell sizes and is not currently supported by TUFLOW.
![Qgis convert raster01.jpg](/w/images/3/3f/Qgis_convert_raster01.jpg)
![Qgis convert raster02.jpg](/w/images/2/26/Qgis_convert_raster02.jpg)
![Qgis convert raster03.jpg](/w/images/e/ec/Qgis_convert_raster03.jpg)
![Qgis convert raster04.jpg](/w/images/b/b3/Qgis_convert_raster04.jpg)
There is more information on this issue in this stack exchange post. To correct this issue, add '-co force_cellsize=true' to the text box underneath the 'load into canvas when finished' button. Add the text after the word 'gdal_translate'