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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2 Answers
Save your raster as ESRI .hdr with datatype as float32 and file extension as ".flt".
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Tank you Luke, that was what i was searching for. It s working now.– IsiCommented Dec 11, 2015 at 11:55
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"BIL" is "Band Interleaved by Line" per desktop.arcgis.com/en/arcmap/latest/manage-data/… It could be important if you want to store multi-band rasters in a .flt file. Maybe concatenate 3 .flt files together sequentially and edit a .hdr file to set the layout to "BSQ"– Dave XCommented Nov 14, 2023 at 14:32
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@i.i.k. yes. As the QGIS Raster -> Conversion -> Translate tool uses GDAL internally to convert, you could cut out the middle man and use the
gdal_translatecommandline tool with a batch/shell script or in python with theosgeo.gdal.Translatemethod. Note: comments aren't for questions, so if you get stuck ask a new question.– user2856Commented Feb 19 at 20:55 -
@user2856 You are right, I should open a new question. Unfortunately the installation of gdal with the pip-packagemanager failed.– i.i.k.Commented Feb 20 at 9:45
To output an raster with data type integer as of type float use the raster calculator.
- 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) - save the output in a format, that supports floating point values, eg GeoTIFF
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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.– IsiCommented Dec 11, 2015 at 7:28