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I would like to create a flt (floating point raster) with QGIS to use later as a terrain in Hec RAS RAS-Mapper. With Raster -> Conversion -> Translate there is no option to create a flt. Is there another way?

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Save your raster as ESRI .hdr aka "BIL" format with datatype as float32 and file extension as ".flt".

  • Tank you Luke, that was what i was searching for. It s working now. – Isi Dec 11 '15 at 11:55
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To output an raster with data type integer as of type float use the raster calculator.

  1. execute the trivial expression "raster@band_no" * 1.0 (replace raster@band_no with an appropriate value or simply double click the entry in the raster channel list)
  2. save the output in a format, that supports floating point values, eg GeoTIFF
  • Thank you for your help. But it is still not what i'm searching for. With the raster calculator I can get the same data typ like raster -> Conversion -> Translate. Like you sad, I can save as an GeoTIFF (*.tif) but I need it as *.flt. I have no possibility to upload a GeoTIFF in Hec RAS - RAS Mapper. – Isi Dec 11 '15 at 7:28

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