[gdal-dev] Extra Decimal places added to ASCII gdal_translate mosaic

[Norman Vine]

try
> gdal_translate -of AAIGrid -co DECIMAL_PRECISION=3  abc.vrt abc.asc
see http://www.gdal.org/frmt_various.html
HTH
Norman

On Jan 24, 2014, at 10:01 AM, Jonathan Moules <jonathanmoules at warwickshire.gov.uk> wrote:

> Hi List,
> I'm trying to mosaic some ASCII grid tiles into a single large ASCII file (which can then easily be handled).
> 
> I'm using this process:
> REM Create list of files
> dir /b /s *.asc > asc_list.txt
>  
> REM Turn into VRT
> gdalbuildvrt -srcnodata "-9999" -vrtnodata "0" -a_srs "EPSG:27700" -input_file_list "asc_list.txt" abc.vrt
>  
> REM actual mosaicing
> gdal_translate -of AAIGrid abc.vrt abc.asc
> 
> The input files are like:
> ncols         500
> nrows         500
> xllcorner     432000.000
> yllcorner     243000.000
> cellsize      2
> nodata_value  -9999.0
> 98.354 98.449 98.658 98.874 99.038 99.096
> 
> But the outputs are like:
> 
> fncols        500
> nrows        1000
> xllcorner    432000.000000000000
> yllcorner    242000.000000000000
> cellsize     2.000000000000
> NODATA_value  0
>  98.353996276855469 98.448997497558594 98.657997131347656 98.874000549316406 
> 
> Suddenly everything has a dozen extra decimal places. Not only does this induce the False Precision problem (we don't have heights to the femtometer!), it also massively increases the filesize.
> 
> How can I get this to not happen?
> 
> Thanks,
> Jonathan
> 
> 
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