Arc Export Raster to flt
Introduction
TUFLOW can directly read elevation data from a Digital Elevation Model (DEM). One of the formats recognised is the binary .flt format. This is a widely used format and is mush faster to read / write than the ESRI ASCII Grid (.asc). The instructions below outline the process for exporting from a raster layer in ArcMap to a ESRI ASCII grid.
TUFLOW can also read .flt 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 == ).
Method
- Open the raster layer that you wish to convert.
- In the Arc Toolbox menu, select Conversion Tools >> From Raster >> Raster to Float
- In the dialogue, select the desired input raster and set the output filename. Note, the extension should be .flt.
- The DEM file is ready for reading into TUFLOW.
Tips
To convert between the .asc and .flt format the TUFLOW utility "asc_to_asc" can be used.
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