[gdal-dev] nodata in .bil format

[Joaquim Luis]

Jan,

My mail used copy-paste so the spaces are the same as printed by 
gdalinfo but I don't think that is important as it merely reflects how 
gdalinfo prints the info. Actually I crossed this problem when my 
gdalread mex lib showed that the nodata for the .bil case was 1e10 
instead of the -9999.

As another set of tests I converted the .bil to .asc with

gdal_translate -of AAIGrid lixo.bil lixa.asc
ERROR 6: lixo.bil, band 1: SetNoDataValue() not supported for this dataset.
Input file size is 250, 250
0...10...20...30...40...50...60...70...80...90...100 - done.

and here despite the error message the -9999 nodata value was written in 
the output.

On the other hand, converting the .asc to .bil (as in below) though no 
warnings created a companion .hdr that does not have the 'nodata' line

gdal_translate -of EHdr lixo.asc lixa.bil
Input file size is 250, 250
0...10...20...30...40...50...60...70...80...90...100 - done.

> Hi,
> There should certainly not be a space between Nodata and Value as in 
> your mail below.
> There are two formats relevant for (at least) arcgis:
> .bil. In this case the keyword is NoData
> .flt. In this case the keyword is NoData_Value.
> Capitalization, afaik, is irrelevant.
> So you could modify the .hdr file as a test, and if it works out as I 
> indicated (NoData=-9999 in stead of NoData Value=-9999) you can file a 
> useful ticket.
> .flt, by the way, is a float array which appears to be used only as an 
> intermediate (conversion) format, as in the conversion tools: float to 
> raster and vice versa.
> Hope this helps a little,
> Jan
>
> On Wed, Mar 6, 2013 at 7:53 PM, Joaquim Luis <jluis at ualg.pt 
> <mailto:jluis at ualg.pt>> wrote:
>
>     Hi,
>
>     While playing a bit with Lastools I came across this behavior. I
>     create outputs in both .bil and .asc ESRI formats
>     The weird thing is that beeing the .hdr header file common (I mean
>     exactly equal) to both outputs the  .bil format does not recognize
>     the nodata value.
>     Is this a knwon issue?    (GDAL trunk on Windows)
>
>     gdalinfo lixo.bil
>     ERROR 6: lixo.bil, band 1: SetNoDataValue() not supported for this
>     dataset.
>     Driver: EHdr/ESRI .hdr Labelled
>
>
>     C:\programs\lastools\data>gdalinfo lixo.asc
>     Driver: AAIGrid/Arc/Info ASCII Grid
>     Files: lixo.asc
>     ...
>     Band 1 Block=250x1 Type=Float32, ColorInterp=Undefined
>       NoData Value=-9999
>
>     Joaquim
>     _______________________________________________
>     gdal-dev mailing list
>     gdal-dev at lists.osgeo.org <mailto:gdal-dev at lists.osgeo.org>
>     http://lists.osgeo.org/mailman/listinfo/gdal-dev
>
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20130306/9e4f6552/attachment.html>