ENVI raster file with nodata change to 0

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I have a geotiff that I converted to a ENVI raster file with the following command:

gdal_translate -of ENVI srtm_05_08.tif data.bil

The geotiff has water values supposedly set to nodata. I am doing an interpolation on the data.bil file, and when I do, the water shows up at a height of about 32000m. I am wondering if there is a simple way to change the nodata to be 0. I tried:

gdal_translate -of ENVI srtm_05_08.tif data.bil -a_nodata none

and

gdal_translate -of ENVI srtm_05_08.tif data.bil -a_nodata 0.0

but neither of those seemed to work.

Is there an easy way to switch the data values? I could do something like:if (val>5000) then val=0 but I am very much a beginner and don't know how to do it.



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