[gdal-dev] Setting the noData flag in a GeoTIFF

[Jonathan Moules]

Hi List,
  I have a question about setting a value as "noData" in GeoTIFFs.

I'm creating a Geotiff with this two stage process (mosaicing a lot of
tiles together):

gdalbuildvrt -hidenodata -srcnodata 255 -vrtnodata 255 -input_file_list
>> tiff_list.txt 255.vrt
>
>
>> gdal_translate -of GTiff -co TILED=YES -co BIGTIFF=YES -co COMPRESS=JPEG
>>  -co JPEG_QUALITY=80 -co BLOCKXSIZE=512 -co BLOCKYSIZE=512 -co
>> PHOTOMETRIC=YCBCR 255.vrt 255mask.tif
>
>
The resultant image is fine, but when I access it, both via ArcGIS and QGIS
it says that there is no noData value set.

I've tried reading into it and came across this -
http://www.gdal.org/frmt_gtiff.html - but it requires a deeper level of the
GeoTIFF library than I have to make much sense of it.

I did see "GDAL_TIFF_INTERNAL_MASK" and tried to set it to true (using -co
and --config), but GDAL just complained about it not being a valid
configuration option.

Can GeoTiffs have a noData value in them that applications will see and
honour? If so, can I set it in GDAL?
It's not critically important, more nice-to-have and also trying to
understand the format better

Thanks,
Jonathan

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