Arc Export Raster to asc
TUFLOW can directly read elevation data from a Digital Elevation Model (DEM). The format recognised by TUFLOW is ESRI ASCII Grid (.asc), this is an open text format that is recognised by a wide range of software including ArcGIS, MapInfo and Quantum GIS. The instructions below outline the process for exporting from a raster layer in ArcMap to a ESRI ASCII grid.
TUFLOW can also read .asc format data for setting a number of model parameters including, initial water level (Read GRID IWL == ), Soil Type (Read Grid Soil == ), roughness (Read Grid CnM == ), storage reduction factor (Read Grid SRF == ).
- Open the raster layer that you wish to convert.
- In the Arc Toolbox menu, select Conversion Tools >> From Raster >> Raster to ASCII
- In the dialogue, select the desired input raster and set the output filename. Note, there is no set extension for this file type, both .asc and .txt are widely used.
- The DEM file is ready for reading into TUFLOW.
To convert between the .asc and .flt format the TUFLOW utility "asc_to_asc" can be used.
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