[gdal-dev] Creating modified copies of a file

[Chaitanya kumar CH]

Derek,

Writing into a raster band is a lot like reading into it. Use the function
you use to read the pixels to write the pixels back.
Don't forget to close the dataset at the end using GDALClose() [1]. Also,
check out the GDALFlushCache() and similar functions in [2].

[1]: http://www.gdal.org/gdal_8h.html#0984222d45a72028fcbbf1f44831ffbc
[2]: http://www.gdal.org/gdal_8h.html

On Tue, Jul 5, 2011 at 9:16 PM, Cole, Derek <dcole at integrity-apps.com>wrote:

>  Hello,
>
> I think I started to ask about this before on this forum, but I have since
> used GDAL a bit more and might be better to generate a new thread.
>
> I have been using GDAL to read in NITF files, getting the RasterBand data,
> and manipulating it, and displaying the results in my viewer.
>
> Now, I would like to be able process data, then save it into a new NITF.
> This new NITF will have the same geocoords and all of the same data as the
> original, with the exception of a new raster band replacing the original. Is
> there a way to create a clone of the original image WITHOUT copying the
> data? I do not want to have to replicate the old data on disk, only the
> overwrite it with my new data that is coming from the external processing. I
> looked into creating the virtual data sets, but I am not sure if that is my
> answer. If I just pass in an empty "" as the destination, it says it will
> create that dataset in memory. Is this what I want to do?
>
> My algorithm processes only a portion of the image at a time, so what I
> envisioned in my head was being able to essentially write out header /meta
> information in a file, and "append" blocks of raster data into the right
> place in the file, as they complete processing. This way there is no single
> lag-point while waiting to create a copy of data on disk to another place on
> disk, or having to create a large file on disk all at once. These image
> files are 1GB+
>
> Any tips for trying to set up this scenario?
>
> Thanks
>
> Derek
>
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>



-- 
Best regards,
Chaitanya kumar CH.
/tʃaɪθənjə/ /kʊmɑr/
+91-9494447584
17.2416N 80.1426E
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