Derek,<br><br>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. <br>Don't forget to close the dataset at the end using GDALClose() [1]. Also, check out the GDALFlushCache() and similar functions in [2].<br>
<br>[1]: <a href="http://www.gdal.org/gdal_8h.html#0984222d45a72028fcbbf1f44831ffbc">http://www.gdal.org/gdal_8h.html#0984222d45a72028fcbbf1f44831ffbc</a><br>[2]: <a href="http://www.gdal.org/gdal_8h.html">http://www.gdal.org/gdal_8h.html</a><br>
<br><div class="gmail_quote">On Tue, Jul 5, 2011 at 9:16 PM, Cole, Derek <span dir="ltr"><<a href="mailto:dcole@integrity-apps.com">dcole@integrity-apps.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div>
<div style="direction: ltr; font-family: Tahoma; color: rgb(0, 0, 0); font-size: 10pt;">Hello,<br>
<br>
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.
<br>
<br>
I have been using GDAL to read in NITF files, getting the RasterBand data, and manipulating it, and displaying the results in my viewer.
<br>
<br>
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?<br>
<br>
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+<br>
<br>
Any tips for trying to set up this scenario?<br>
<br>
Thanks<br>
<br>
Derek<br>
</div>
</div>
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