Le 24/08/2021 à 20:07, ni hao a écrit :
Hi Even,
Thank you for your reply.
Is there a simpler example to remove DES (say DES ID = 1) from an
existing NITF, or replace DES with a null string?
No, there's no code to update/remove a DES . You'll need to edit the
file at byte level, or rewrite a new one without them
------------------------------------------------------------------------
*From:* Even Rouault <[email protected]>
*Sent:* August 24, 2021 1:50 PM
*To:* ni hao <[email protected]>; [email protected]
<[email protected]>
*Subject:* Re: [gdal-dev] NITF DES
Hello,
yes, first look:
- at the doc of the DES creation option in
https://gdal.org/drivers/raster/nitf.html#creation-issues
<https://gdal.org/drivers/raster/nitf.html#creation-issues>
- at
https://gdal.org/drivers/raster/nitf_advanced.html#data-extension-segments-xml-des
<https://gdal.org/drivers/raster/nitf_advanced.html#data-extension-segments-xml-des>
you will need to compose the DES segment in a relatively low level.
Look at examples in :
-
https://github.com/OSGeo/gdal/blob/de6a6b44302be5c6a294d86f6ca35ebcdce563ff/autotest/gdrivers/nitf.py#L3728
<https://github.com/OSGeo/gdal/blob/de6a6b44302be5c6a294d86f6ca35ebcdce563ff/autotest/gdrivers/nitf.py#L3728>
-
https://github.com/OSGeo/gdal/blob/de6a6b44302be5c6a294d86f6ca35ebcdce563ff/autotest/gdrivers/nitf.py#L3795
<https://github.com/OSGeo/gdal/blob/de6a6b44302be5c6a294d86f6ca35ebcdce563ff/autotest/gdrivers/nitf.py#L3795>
Note: gdal.EscapeString(des_data, gdal.CPLES_BackslashQuotable) with
binary data only works since a commit done yesterday in GDAL master!
If using an older version, backslash escaping can be done with :
escaped_data = data.replace(b'\\', b'\\\\').replace(b'\0', b'\\0') \
.replace(b'\"', b'\\"').replace(b'\n', b'\\n')
Best regards,
Even
Le 24/08/2021 à 18:45, ni hao a écrit :
Hi List,
Is there a GDAL utility or Python code to delete/alter/write to NITF
Data Extension Segments (DES) ?
Thanks.
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